[PVE-User] bad ZFS performance with proxmox 6.2

[Roland]

hi,

i remember having seen performance degradation reports on zfsonlinux
issue tracker, for example:

https://github.com/openzfs/zfs/issues/8836


to blame zfs for this, you should first make sure it is not related to
driver issues or other kernel/disk related stuff, so i would recommend
comparing raw disk write performance first, to see if that may also make
a difference already.

furthermore, i would recommend using more data when doing write
performance comparison at such high troughput rate

regards
roland

Am 06.10.20 um 13:12 schrieb Maxime AUGER:
> Hello,
>
> We notice a significant difference in ZFS performances between proxmox 5.3-5 and proxmox 6.2.
> Last year when we tested proxmox5.3 on the HPE-DL360Gen9 hardware.
> This hardware is provided with 8 ssd disks (2x 200-GB OS dedicated mdadm RAID0 and 6x 1-TB ZFS pool for VMs storage)
> On ZFS pool we measured the peak value at 2.8GB/s (write)
> Actually on promox6 we measured the peak value at 1.5GB/s (write).
>
> One server, ITXPVE03 was running Initially on proxmox 5.3-5.
> peak performance 2.8GB/s
> Recently it has been reinstalled on proxmox 6.2 (from iso)
> peak performance 1.5GB/s
>
> to confirm this observation we have extended the checks to the 4 servers, identical hardware and low level software, BIOS and firmwares versions)
> The measurements confirm the statement
> All tests are done in serveurs idle state conditions with zero ative workload, all VMs/Containers shutdown.
> ZFS configuration are identical, no compression, no deduplicatation
>
> root at CLIPVE03(PVE6.2):~# dd if=/dev/zero of=/zfsraid10/iotest bs=1M count=1000
> 1000+0 records in
> 1000+0 records out
> 1048576000 bytes (1.0 GB, 1000 MiB) copied, 0.851028 s, 1.2 GB/s
>
> root at ITXPV03(PVE6.2):~# dd if=/dev/zero of=/zfsraid10/iotest bs=1M count=1000
> 1000+0 records in
> 1000+0 records out
> 1048576000 bytes (1.0 GB, 1000 MiB) copied, 0.722055 s, 1.5 GB/s
>
> root at CLIB05PVE02(PVE5.3-5):~# dd if=/dev/zero of=/zfsraid10/iotest bs=1M count=1000
> 1000+0 records in
> 1000+0 records out
> 1048576000 bytes (1.0 GB, 1000 MiB) copied, 0.397212 s, 2.6 GB/s
>
> root at CLIB05PVE01(PVE5.3-5):~# dd if=/dev/zero of=/zfsraid10/iotest bs=1M count=1000
> 1000+0 records in
> 1000+0 records out
> 1048576000 bytes (1.0 GB, 1000 MiB) copied, 0.39394 s, 2.7 GB/s
>
>
> At the ZFS level we can notice a difference in the version of zfsutils-linux
> 0.7.X on PVE5.3-5 (0.7.12)
> 0.8.X on PVE6.2 (same measure on 0.8.3 and 0.8.4)
>
> has anyone experienced this problem ?
>
> Maxime AUGER
> Network Team Leader
> AURANEXT
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