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

[nada <nada@verdnatura.es>]

hi Marco
you have NFS at server B so the speed must be better @B
but before disk performance test you may also test
traffic e.g. by iperf or iperf3
memory e.g. by memtest
all the best
Nada

On 2022-04-24 19:56, Marco Gaiarin wrote:
> 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.