[PVE-User] Shared storage on NAS speed - LVM(over iSCSI) vs NFS

[Emmanuel Kasper]

On 07/19/2017 11:32 AM, Mikhail wrote:
> Hello,
> 
> Thanks for your responses.
> The issue appears to be somewhere beyond iSCSI.
> I just tried to do some "dd" tests locally on the storage server and I'm
> getting very low write speeds:

do not use dd to benchmark storages, use fio

with a command line like

fio  --size=9G --bs=64k --rw=write --direct=1 --runtime=60
--name=64kwrite --group_reporting | grep bw

inside your mount point

or use the --filename option to point to a block device

from this you will get reliable sequential write info