Lvm slow write performance The performance seems to be better now too, for some reason. A dedicated RAID processor in a hardware RAID controller can offload the parity bit calculations from the CPU, and the RAID controller's APU is designed to perform well enough to handle the max throughput of the port. My test environment consists of HDD drive with LVM on LUKS. Looking back at one of the old threads, Fixing Slow NVMe Raid Performance on Epyc, 2GB/s was basically what mdadm maxed out at on write speed using from 8-24 NVME drives, definitely CPU bottleneck although it wasn’t clear whether the bottleneck was in the CPU parity Placeholder. The key trick with LVM is the kernel can manage turning things on and off even without rebooting, and a hard crash means the backing device at least has some/most data on it without its cache drive being alive. an SSD) to improve the performance of the LV. Proper way to deal with corrupt XFS filesystems. 1. With NFS, this cache can be used to significantly accelerate file writes and reads, as data is first written to the fast NVMe storage before being committed to slower spinning disks. I wrote an article on optimising storage stack alignment which you may find useful. g. conf file) instead of LVM -> test VM write speed-install proxmox to hdd from ISO distr -> test VM write speed On this i am running a Debian Wheezy on two of the disks, the other four disks are setup with md for raid5 with LVM on top for guest storage. For best performance using a qcow2 image file, increase the cluster size when creating the qcow2 file: Overall - bad performance, compared to host. Seth. On another raid1 setup on the same machine I get normal read speeds (maybe because I'm not using cryptsetup). Once I noticed something was off when our production DB was causing massive IO At first I thought it was a read and/or write, as cp of a 4. So far you have presented zero performance data. , I did a short I/O benchmark on the mounted disk inside my pod and realised that the disk I/O is very low and intolerable for an SSD drive. There are ways to tier or cache on a Linux storage stack. BT speakers and other speakers from quality audio companies have been shown to massively interfere. LVM random write speeds againts the raw mapper device hard-drive; performance; lvm; Share. 03. Initially i wanted to use XFS as filesystem, but the performance tests showed a really bad write performance with XFS compared to the LV directly or to an EXT4 filesystem. And I'm experiencing horrible write performance on my LVM cached HDD ever since my cache volume is hovering between 99. SQL queries were extremely slow as well, Unfortunately I noticed that I am seeing some pretty low disk write speeds inside of VMs running on a 512GB Intel 660p NVMe SSD. I wondered if it was an alignment problem. I created single LV for virtual machine drive and reused it for both tests to maintain same place on HDD drive to maintain consistent performance (HDD read/write speed depends on physical position). Same ~1gb file used for all tests (just an ubuntu server iso file). * Really full partitions * Slow DNS * Bad wifi situation (if there's lots of interference, the performance can wreak havoc on all networking). Note that LVM can throw out alignment due to odd length headers. After everything had Hi there Currently I have some performance problems in VMs runnung on my ProxMox node. to test the read speed. 3G 0 lvm sdb 8:16 0 238. I think it has become slower overtime. Also, anyone currently running any cool lvm cache setups? or want to share their setups or lessons learned for me to incorporate into the video? I shot a video ages ago editing backlog updating it with some of the new data/metadata features. For the time being LVM+ext4 may be my the best solution, as it would let me still have some form of snapshotting while hopefully giving me good performance. I also expect some overhead of the LVM, so I do not expect the read speed to be twice that of a single SSD. When these drives were formatted as ExFAT, I was seeing write speeds around 140-150MB/s. At the same time the "Total DISK WRITE" drops down to 0 B/s and "Actual DISK WRITE" jumps between 20 - 70 MB/s . 2: Read operations happen significantly more often than write operations, as applications The problem was really slow performance and IO delay, the fix was to disable "sync". Performance will be unpredictable, which is worse than being slow. The issue is that in KVM, all disks perform at the same speed, so the cache is rarely utilized, and I don't see any performance benefits. Here is a previous version of this answer. 25MB/s) 2) - pve 202009 So why is the write speed so slow when comparing performance from the host itself, and from within a VM ? Last edited: Nov 19, Running on VM using LVM-Thin in ubuntu (ext4), virtio scsi single, io thread, no cache, vm io scheduler = none. Don't do it. block zeroing The write is a tad slower, I'm not sure why. When we checked, we noticed that writing to Writing to one volume can have a maximum 1. This happened yesterday as well, after rebooting pve, disk performance improved for a while. It may depend upon what file systems you are using, is RAID involved, how much free memory you have available, and what exact operations you The values for block-wise read and writes look great with 450MB/s and 650MB/s. 7. How to correctly attach a disk to a zpool to create a mirror? - zpool attach says no such pool or dataset. Bcache and lvm writeback look very similar, only compress-force is slightly slower. 3 — Scenario : Consider a scenario with three disk I have A pair of Dell R640 NVME with Samsung PM1725. Typically, a smaller, faster device is used to improve i/o performance of a larger, slower LV. A new snapshot system has been in the works for LVM for some time that that alleviates the worsening condition from keeping around multiple snapshots but it is not yet the default. This is an out of the box basic setup. When the blocks are rewritten or overwritten, they write much faster at the expected speed. Previous answer. ; Incorrect Drive Settings: Features like write IDE -- Local-LVM vs CIFS/SMB vs NFS SATA -- Local-LVM vs CIFS/SMB vs NFS VirtIO -- Local-LVM vs CIFS/SMB vs NFS VirtIO SCSI -- Local-LVM vs CIFS/SMB vs NFS. 8; Guest: Ubuntu Desktop 17. The storage array (which might be a single device -- an array of one My conclusion, as related to your question, is that LVM may or may not slow things down. The whole point of using dm-integrity is not to provide amazing performance on SSDs, but rather to guarantee that there is no corruption of data written to the disk. ; Use the (↓) key to navigate to the P = Last Used Cpu (SMP) field. I have found some articles about it but they are all 5-6 years old. The speed is slow! It is slow to read or write files to the system. Slow sequential speeds on Performance connected to a RocketRaid card was slower across the board. I will produce 2 more tests:-give a VM direct access to hdd (via tweaking vmid. Skip to main content. Performance tuning for LVM offers several benefits, including: Consider implementing LVM caching using tools like lvmcache to improve read and write performance for frequently accessed data. You want to make sure the LVM blocks are aligned properly with the underlying system, which should happen automatically with modern distributions. 38 and mitigations=off (best scenario) is ~50%. Historical data is best as it can be queried ad nauseum - iostat, collectl, dstat . Create a new SR (can be ext (local) or LVM (local) -- the results are the same for either Conventional LVM snapshots however, do have terrible performance for keeping even one of them around for long, and it gets much worse with more snapshots. VM on WD is mostly unusable, VM on Seagate is usable but still inadequately slow. lvcreate -n red4tb -L 2t localred /dev/sdc – Feel free to format the LV & mount it as you wish at this point – #take note that the PV is specifed when creating the fast LV. Although the performance under the 10 Gbit network is insufficient, at least the read and write performance approaches the bandwidth limit However, looking at my test results, WRITE is very bad (296. If you remove the bitmap, you may get slightly better write performance (as writing to the disk will cause the bitmap to be updated, if one is present) – at the cost of losing a From a speed standpoint, RAID 0 is slower then no RAID (because the system has to decide which drive as well as which partition and which file, so it's inevitably slower than a single drive). Use df -T to check which file systems are in use and use fsck (e. But writing to two volumes at the same time can only achieve a speed of about 2. Results of an fio benchmark as below: # fio --rw=write --ioengine=sync --fdatasync=1 --directory=/data --size=22m --bs=2300 --name=mytest Your work load is dominated by interactive applications, either users who otherwise may complain of sluggish performance or databases with many I/O operations. This can also serve as the thin pool chunk size. I . lvcreate -n cac0 -L 100g localred /dev/nvme0n1. , Gigabit network card, standard SATA non-SSD hard drives, consumer-grade motherboard etc. 6GB/s speed. 8G 0 disk ├─local500GB-local500GB_tmeta 252:4 0 4. As reference, our From a speed standpoint, RAID 0 is slower then no RAID (because the system has to decide which drive as well as which partition and which file, so it's inevitably slower than a single The bad recorded performances stem from different factors: mechanical disks are simply very bad at random read/write IO. There are a few ways to improve performance of LVM snapshots. RAID5 has an inherent write Additionally, write caching and write re-ordering improve the performance of a system. No data, no way for anyone to sensibly assist. 3G 0 lvm └─local500GB-local500GB_tdata 252:5 0 456. 2G 1 lvm ZFS Pool "zstorage" is its name, mirror'd; ashift=9 (aligned with the 512-byte physical sector size of these disks) NOTE: my older pool I did ashift=12, even though the older drives were also 512-byte sector, but for this testing when I created the NEW pool I went with ashift=9 in an attempt to address the slow I/O (1:1 alignment per reading gives the best The cache logical volume type uses a small and fast LV to improve the performance of a large and slow LV. In general I would expect performance loss of a vm 10% for cpu, 20% for network and 50% on I/O, for LVM-thin has a pretty large performance impact, as when VMs need to write data to unmapped areas on the LVM-Thin volume its 3-4 IO operations that normally would be 1. There are cases where LVM can cause performance problems. If your slow partition is mounted to /, you can try to do a temporary remount with barrier disabled by doing:. On kernel 6. ZFS is both a filesystem and a volume manager, the line gets very blurry with ZFS. However, if the goal is to learn the linux disk subsystem, using LVM would be invaluable. I thought files are written to both SSDs simultaneously and therefore the read speed of the combined logical volume might even be higher than that of one single SSD. 4. 1MB/s), 37. At the same time, LVM is "leaner" and doesn't have much overhead. However, the disk can fail to correctly flush the blocks to disk. The hardware seems to work fine , since when I tried to boot that system from an external USB disk running Windows 10, I got the expected performance: What block size I/O are you optimising for? RAID5 is very slow for partial writes, so you need to make sure you optimise it for the block size your application will write most of the data in. See: Integrity makes writes slower. ; Press the spacebar to select the P = Last Used Cpu (SMP) field. This phase seems to last for a constant time. It seems to be two times faster? Ceph reading and writing performance problems, fast reading and slow writing Hello, we need to migrate all cloud environments to Proxmox. The crawl started OK, but after a few hours we saw slowdowns (apparently, as the store was growing). Change file name and size (in GByte) to match your needs. I cannot explain why NFS has similar results Like Bcache and LVM cache, the goal with dm-cache is to improve random read write performance of the slow HDD by using small but fast SSD or NVME device. 04; Performance tested with Memory issues can significantly slow down a system, leading to excessive swapping and high latency. Slow SQL query with nested subquery They build a RAID 6 with mdadm and a chunk size of 256k. Memory Ballooning : Memory ballooning is a feature that allows Proxmox to reclaim unused memory from VMs. The main advantage of dm-cache is that it is possible to setup on devices that already have a Since the results are the same in RAID1 and even when I create a striped LVM volume, I guess there must be a bottleneck somewhere that prevents my hardware to run at full speed. However, while COW (copy-on-write) COULD slow your system down, it should not be something easily noticable. I'm experiencing very poor read performance over raid1/crypt/lvm. LVM caching can enhance I/O performance by utilizing faster storage devices as cache for slower storage pools Hi All, I notice that the write performance is real slow inside a vm. In general, Ext3 or Ext4 is better if an application uses a single read/write thread and small files, while XFS shines when an application uses multiple read/write threads and bigger files. In this tutorial, I will show you how to improve the performance of your ZFS using the affordable consumer-grade hardware (e. Specs of the node: - 1x Xeon E5-2620v4 - 64 GB RAM - 4x 1TB WD Gold - Software RAID 10 - Full Disk Encryption - LVM Thin for VMs On the host, I get around 200MB/s: (zrh1)root@vms1:~# dd if=/dev/zero tl;dr: Performance impact of LUKS with my Zen2 CPU on kernel 6. WRITE: bw=37. LVM is only slightly more complex to add later when making that transition to add new hardware. Essentially, having a snapshot turns async writes into sync writes (or, more precisely, every async write can potentially imply an additional sync write). 1. I would expect much lower numbers if alot of read-modify-write was happening to the disks. a large sequential read) I get speeds over 600MB/s. Let’s look at compression with cache: Cache and BTRFS compression. Performance directly on the raid5 (measured by creating a LV and mounting it and running bonnie++ and dd tests) is fine, giving me ~220/170MB/s read/write, but on guests i get decent reads and 40-50MB/s Benefits of Performance Tuning for LVM. I'm seeing a 10-fold performance hit when using an LVM2 logical volume that sits on top of a RAID0 stripe. But now it is hanging on a simple ls -lh, XFS slow performance on LVM'ed RAID, faster when RAW or non-LVM. Writing to that volume is incredibly slow at 1. 11 + mitigations (worst scenario) it is over 70%! The recent SRSO (spec_rstack_overflow) is the main culprit here, with a MASSIVE performance hit. With a newer Zen3 or Zen4 CPU it is likely there is less of a performance impact. 2G 0 lvm │ ├─pve-data 253:4 0 346. Optimize LVM striping: lvcreate -i 2 -I 256 -L 10G -n lv_name vg_name . #creating the slow & large LV. Regarding performance: ZFS is notoriously hard to "really" benchmark, because the ARC will cache all reads and writes for you. Hello! This is related to a previous thread of mine; my system is an up to date Arch install residing in two partitions in an external SSD, one unencrypted holding /boot, and a large LUKS partition containing various logical volumes via LVM. A ZFS mirror or zRAID is at best 80% slower than an LVM on the same server. 9% and 100% cache usage. pasted-from-clipboard. 12. Now, with the same drives formatted at ext4, I'm seeing write speeds of around 40MB/s. On top of that mdraid i have LVM which then holds the different filesystems. I recently got a brand new Thinkpad P53 and bit-copied via dd the above system from my external SSD to my laptop's NVME. 7G 0 lvm │ └─local500GB-local500GB 252:7 0 456. Hi @rhawalsh. If the snapshot is stored on the same disk as the origin volume, you're also causing a lot of seeking, which slows things down even further. I used the command. That’s different for lvm writecache. 2. In the same time, write speeds are about 2x+ faster on the same setup. Once extents start writing to the slow PV, that chunk of data will be slow. 8 MB/s and the CPU usage stays near 0%. Then, creating and starting new images was slow as well. Turning off the write cache of an Advanced Format drive may cause a very large performance impact if the application/kernel is doing 512 byte writes, as such drives rely on the cache to accumulate 8 x 512-byte writes Starting the docker service was extremely slow, taking over 2 minutes. Provided by: lvm2_2. I know that certain file systems have "copy-on-write", including Ext3, ZFS, WAFL, VERITAS (NetBackup), and btrfs. This server is running a simple two-disk software-RAID1 setup with LVM spanning /dev/md0. . 0 GiB) copied, 1. 0 GiB) copied, 10. I have Proxmox 8 and use ZFS for the boot mirror and the zRAID. DD should really only be used for moving data and not benchmarking disk performance alone. This is only true for random write. Diagnosing Memory Usage. Further, on linear volumes, it will use one PV at a time. Many people found a problem on their ZFS system. Transfers to/from any Proxmox guest is slow and highly variable. The distribution fluctuates between 30:50 % and 50:30 %. Bcache (block cache) allows one to use an SSD as a read/write cache (in writeback mode) or read cache (writethrough or writearound) for another blockdevice (generally The write performance still bewilders me though, I'm used to zfs where writing is faster than reading on an array, but there's a logical explanation for that one. The data is this untar'ed linux kernel source directory. Both reads and I'm seeing very strange performance characteristics on one of my servers. By combining mdadm with LVM, you can duplicate cache devices and do most of the things bcache does. Use these tools to check memory statistics: Use RAID 10 for better read/write performance. From a reliability standpoint, a two-drive RAID 0 has We can see that the impact of network bandwidth on performance is huge. I decided to test with my external HDD and the exact same slowness is present. My tests show synchronous sequential writes to a snapshotted LV are around 90% slower than writes to a normal LV. Improve this question. 6GB/s. 3G 0 lvm └─local500GB-local500GB 252:7 0 456. 9,383 1 1 gold badge 22 22 silver badges 37 37 bronze badges. Note that LVM cannot detect and correct errors in your data, though. I have adapted and expanded it, to provide context and corroborate the above source. # check read performance sudo hdparm -Tt /dev/sda # check write performance dd if=/dev/zero of=/tmp/output bs=8k count=100k; rm -f /tmp/output But I got roughly the same figures as I got on a single disk, before configuring the RAID array. This combination of LVM and disk write caching can be a dangerous combo. The most obvious one is the chunk size, which can be Try disabling the "barrier" option on your filesystem. 6. I LVMCACHE(7) LVMCACHE(7) NAME top lvmcache — LVM caching DESCRIPTION top lvm(8) includes two kinds of caching that can be used to improve the performance of a Logical Volume (LV). Ceph reading and writing performance problems, fast reading and slow writing Hello, we need to migrate all cloud environments to Proxmox. When caching, varying subsets of an LV's data are temporarily stored on a smaller, faster device (e. The backend storage is on btrfs ssd. 1ubuntu5_amd64 NAME lvmcache — LVM caching DESCRIPTION lvm(8) includes two kinds of caching that can be used to improve the performance of a Logical Volume (LV). Host: Arch Linux, kernel 4. Procedure. Making it report slower speeds. your stack should be: partitions -> LVM -> raid1+integrity LVs. 32). I have noticed that new blocks are slow to write in virtual disks. To discover how bad they can be, simply append --sync=1 to your fio command (short story: they are incredibly bad, at least when compared to proper BBU RAID controllers or powerloss-protected SSDs);. One quirk I found was that with large metadata pools it could degrade performance e. 5G 0 disk ├─sdb1 8:17 0 NVME is LVM, 10TB is XFS (tried ZFS but it was much slower, used a lot of ram and seemed overkill on a single disk), both set to no cache, IO thread, Async IO: Threads for VM, using VirtIO SCSI controller, only one VM and 2 LXCs running. Follow edited Jan 3, 2019 at 6:17. PVs with the same size and speed is easier to understand. So LVM is much faster than raw device for random write access specially for large filesizes. Conclusion: In my scenario CIFS/SMB perfomance better and more reliable when using the Write Back cache and the VirtIO SCSI storage controller. For example, using FAT32 for large drives or not using a journaling filesystem where it's beneficial can hinder speed. 11-2. AKA overhead. Improving LVM Snapshot performance. Using dd to read directly from the stripe (i. ). To do this, a separate LV is created from the faster device, and then the original LV is converted to start using the fast LV. One of the logical volumes /dev/vg0/secure is encrypted using dmcrypt with LUKS and mounted with the sync and noatimes flag. These were quite underwhelming results. atop while experiencing slow performance (while updating Firefox via the build in Software Center via snap): Output of atop. You can find more info on barrier here, simply put it improves data integrity at the cost of some performance, but sometimes it gets excruciatingly slow. Extremely slow qemu storage performance with qcow2 images. nvme + hdd was There are a few things that can make a system slower than it should be that aren't obvious. It is the same test I use on btrfs with this stack configuration : Partition / LVM / crypt File System: Using an inappropriate or outdated file system can impact performance. this is inside a container: 1073741824 bytes (1. asked Dec 26, 2018 at 19:03. However, per-character seem really slow with just 0,5MB/s and 3MB/s. SSD Optimization. This is limited by 6 drives (raid6 of 8 drives have only 6 independent drives) times 260MB/s (one drive speed). Display the individual threads: $ top -H Press the f key to display the fields manager. img 100G. 2MiB/s-37. When caching, varying subsets of an LV's data are temporarily stored on a smaller, faster device (e. 93097 s, 556 MB/s this is inside a vm: -1073741824 bytes (1. Run DD once a day and store the results. The crawl created a number of files on the partition, and in particular a 156G file (the store of the crawl). 5 GB iso file took 100x longer than in a good fs. The NVMe drive is theoretically capable of 1,28 GiB/s random writes under ideal conditions, but write-speeds were bottlenecked at around 30–45 MiB/s. VM Guest resize on CentOS7 And sync operations are slow on spinning media. In this case, a small thin pool chunk size is more appropriate, as it reduces copy-on-write overhead with snapshots. I assume it will get even slower towards the end of the process. While mc mirror is running, the server system load goes over 70, with top showing io-wait 70% to 87%. This can be caused by VM hypervisors, in-built hard drive write caching, and old Linux kernels (<= 2. Bottom Line: I'm having slow write speeds to Proxmox guests. #take note that the PV is specifed when creating the metadata LV The dashboards are slow to load and queries are slow to respond etc. Also, if you have snapshots enabled (with whatever controller you are using to create the LV), that would also slow them down. When writing to three or four volumes together, the total speed is also 2. This got very low overhead and especially with slow devices like HDDs, it could increase performance, as the slow down of the compression might be smaller than the performance gail you get by needing to read/write less data. ext4) to check for file system errors. 8/ /mnt/dst/, the destination being on the btrfs on VDO filesystem. Once copied and written, writes to the same chunk are only 15% slower. 10. Writeback caching is NOT being used. Now where I use DD for benchmarking is for historical performance. First picture is me doing userbenchmark after setting up raid0. Phase 3: Within the last 3 s "Actual DISK WRITE" jumps up to > 400 MB/s while "Total DISK WRITE" stays at 0 B/s. ZFS Poor Write Performance When Adding More Spindles. 2G 1 lvm Software RAID5 is horribly slow, because it has to calculate parity bits, which can't meaningfully be accelerated on the CPU. ; Press the q key to close the fields manager. 2MiB/s (39. Guest is In my experience, future-proofing with LVM trades management complexity in the period up to modification for a one-time future benefit that often never pays off. 5192 s, 102 MB/s is there something i can do to make it fast again. Enable TRIM: fstrim -v / For anyone who find this in the future, here's some general Linux parity RAID (level 5 and 6) tuning advice I didn't see in the answers or comments: (1) do not disable NCQ unless you have drives whose NCQ behavior hurts software RAID performance, and doing so anyway will often hurt performance; (2) increase the stripe cache size to reduce the RAID parity read-on-write Is this normal? My understanding of LVM is very basic. LVM sda3_crypt busy 88% LVM gubuntu-root busy 88% DSK sda busy 91% MB/s read and write are I could be wrong here, but DD does some extra work to ensure that that the data is written correctly. Ideally, I want the RAID1 mirror to struggle with I/O, allowing me to observe the cache volume filling LVM with EXT4 - Slow to boot, slow to write (actually bad WD500 HDD) (EDIT: I was attempting to migrate my desktop to a Western Digital WD500AADS Green drive. 11. 28. The OS writes the block to its local disk, that IO request is handled by the host that handles LVM-Thin, the block area on the volume has a commit, wait, commit-back to the volume. /efi └─sda3 8:3 0 465. I have re-run the first test to compare performance when the system is super slow vs when it's just somewhat sluggish. 1 GB, 1. dm-cache is a "slow moving" cache: many read/write misses are required to promote a block, especially when promoting a new block means to demote an already-cached Write performance take a significant hit, which can be limited by using a BBU-enabled HW RAID card; cache: a performance enhancing target enabling both read and write caching of slower There is no decrease in random write speeds with LVM when file size is increased. However, I lack a reference to really judge these values. For the rather slow file system JFS (at least compared to XFS & BTRFS), the cached devices are as fast as the native raids. Code: My write performance is now suddenly 2x better and my IO delay significantly smaller! I don't know if I can break a ZFS mirror without losing data and I don't know if a thin LVM can be mirrored. Apr 1, 2024 648 171 Another note LVM really slows down performance with drbd; so make sure you avoid it. I wonder if using LVM logical drives slow down the I/O performances of drives. 3G 0 part ├─pve-root 253:0 0 96G 0 lvm / ├─pve-data_tmeta 253:1 0 3. I'm trying to work out why writing to ext4 partitions on my server is so slow. Second picture is a bench of when my 2 nvme sticks were not in raid. I am using two 1TB nvme GEN4 sticks called CSSD-M2B1TPG3VNF 1TB, yes weird The rsync baseline was run writing to another directory on the same btrfs filesystem as the directory which is bind-mounted as /data in MinIO. e. The top utility now displays the CPU load for individual cores and indicates which CPU each process or Through the parallel writing of stripes, LVM Striping significantly boosts the overall throughput and performance of the logical volume. A slow Proxmox installation disk can bottleneck the overall performance of your VMs. Here are my answers : I simply copy-paste directory with cp -r linux-5. Steps to reproduce: Create a new VM with a minimal Debian installation; Install fio in the VM. Now I figured that I should be explicitly using the LVM drive instead of /dev/sda and /tmp/output. I'm going to leave this question open -- We're getting a new slate of RAID cards in within the next week or two in order to test, and I'm still looking for optimizing tips on getting more than single-disk performance, which doesn't seem to have been thoroughly answered. The two kinds of caching are: • A read and write hot-spot cache, using the dm-cache kernel module. Note that RAID 10 is recommended when the workload has a large proportion of small file writes or random writes. + For JBOD, use a thin pool chunk size of 256 KiB. mount -oremount,barrier=0 / Try to do whatever it is that was For best performance using a raw image file, use the following command to create the file and preallocate the disk space: qemu-img create -f raw -o preallocation=full vmdisk. I noticed this issue when I reformatted my off-site backup drives from ExFAT to ext4. NVME performance is terrible. But with NVMe the bandwidth shouldn't be the bottlenck and LZ4 compression might hurt more then it helps by increasing the root@pve03:~# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS sda 8:0 0 465. Proxmox itself is not installed on this SSD, it is only used For scientific computing, we need fast read/write speeds. Better performance when HDD write cache is disabled? (HGST Ultrastar 7K6000 and Media Cache behavior) 3. 5G 0 lvm │ └─pve-data-tpool 253:3 0 346. , fsck. Currently, I am getting below mentioned performance. justinclift Well-Known Member. It does this by storing the frequently used blocks on the faster LV. png. So I upgraded one of our machines with 2 SSDs. prmmg dburvf qkjxl quhl gmpmzg bvbl qpqx cnorxw hsmhvx sssdned hzfidr lyjcej yyqzs piqtws zcxkzos