Why don't you try with 4096 ?
Most block devices have a blcok size of 4096 and anything bellow is slowing
them down.
Best Regards,
Strahil NikolovOn Sep 24, 2019 17:40, Amit Bawer <aba...@redhat.com> wrote:
>
> have you reproduced performance issue when checking this directly with the
> shared storage mount, outside the VMs?
>
> On Tue, Sep 24, 2019 at 4:53 PM Vrgotic, Marko <m.vrgo...@activevideo.com>
> wrote:
>>
>> Dear oVirt,
>>
>>
>>
>> I have executed some tests regarding IO disk speed on the VMs, running on
>> shared storage and local storage in oVirt.
>>
>>
>>
>> Results of the tests on local storage domains:
>>
>> avlocal2:
>>
>> [root@mpollocalcheck22 ~]# dd if=/dev/zero of=/tmp/test2.img bs=512
>> count=100000 oflag=dsync
>>
>> 100000+0 records in
>>
>> 100000+0 records out
>>
>> 51200000 bytes (51 MB) copied, 45.9756 s, 1.1 MB/s
>>
>>
>>
>> avlocal3:
>>
>> [root@mpollocalcheck3 ~]# dd if=/dev/zero of=/tmp/test2.img bs=512
>> count=100000 oflag=dsync
>>
>> 100000+0 records in
>>
>> 100000+0 records out
>>
>> 51200000 bytes (51 MB) copied, 43.6179 s, 1.2 MB/s
>>
>>
>>
>> Results of the test on shared storage domain:
>>
>> avshared:
>>
>> [root@mpoludctest4udc-1 ~]# dd if=/dev/zero of=/tmp/test2.img bs=512
>> count=100000 oflag=dsync
>>
>> 100000+0 records in
>>
>> 100000+0 records out
>>
>> 51200000 bytes (51 MB) copied, 283.499 s, 181 kB/s
>>
>>
>>
>> Why is it so low? Is there anything I can do to tune, configure VDSM or
>> other service to speed this up?
>>
>> Any advice is appreciated.
>>
>>
>>
>> Shared storage is based on Netapp with 20Gbps LACP path from Hypervisor to
>> Netapp volume, and set to MTU 9000. Used protocol is NFS4.0.
>>
>> oVirt is 4.3.4.3 SHE.
>>
>>
>>
>>
>>
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