[PVE-User] Disk performance test guidance...

[Sylvain Le Blanc]

ZFS RAIDZ Drive Requirements

   - RAID Z requires 3 drives or more
   - RAID Z2 requires 5 drives or more
   - RAID Z3 requires 8 drives or more

https://raidcalculators.com/zfs-raidz-capacity.php

Hope this help !

Le dim. 24 avr. 2022 14 h 40, Marco Gaiarin <gaio at lilliput.linux.it> a
écrit :

>
> In a set of servers (some brand new dell T440 with 64GB or RAM, 2 500M SSD
> ZFS Raid 1, three 4TB HDD in ZFS raid3) we are catching some performance
> issue, eg in some operation we catch 10/20 MB/s maximal performance, with
> load that go sky high (load 40).
>
>
> An example: a couple of identical servers, connected via single gigabit
> connection.
> I've setup on server B a NFS server on HDD ZFS pool, then a NFS type
> storage
> (on both servers, they are clustered).
>
> I've copied from my PC a PVE VM backup, roughly 500GB of data, via NFS to
> server B: 80-90 MB/s, load 2-4.
>
> I've restored the VM on server A, thus *reading* data fron NFS, and
> restoring again on HDD ZFS pool on server A: 10-20 MB/s transfer rate, load
> at 40.
>
>
> This make no sense to me. As subject say, there's some 'Disk performance
> test
> guidance' document, so i can test and find the bottleneck?
>
>
> Thanks.
>
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> americani
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