Hi Jiri,

Sorry for the delay.

Do you experience the same issue for non-gluster domains?

In order to profile your gluster volume while export is in progress, follow the instructions in this link [1].

(Please execute "gluster volume profile <volname> start " and then "gluster volume profile <volname> info")

[1] https://access.redhat.com/documentation/en-US/Red_Hat_Storage/2.1/html/Administration_Guide/chap-User_Guide-Monitor_Workload.html

Regards,

Shani Leviim

On Mon, Nov 20, 2017 at 5:20 PM, Jiří Sléžka <jiri.slezka@slu.cz> wrote:

Hi,

I am trying realize why is exporting of vm to export storage on
glusterfs such slow.

I am using oVirt and RHV, both instalations on version 4.1.7.

Hosts have dedicated nics for rhevm network - 1gbps, data storage itself
is on FC.

GlusterFS cluster lives separate on 4 dedicated hosts. It has slow disks
but I can achieve about 200-400mbit throughput in other applications (we
are using it for "cold" data, backups mostly).

I am using this glusterfs cluster as backend for export storage. When I
am exporting vm I can see only about 60-80mbit throughput.

What could be the bottleneck here?

Could it be qemu-img utility?

vdsm 97739 0.3 0.0 354212 29148 ? S<l 15:43 0:06
/usr/bin/qemu-img convert -p -t none -T none -f raw
/rhev/data-center/2ff6d0ee-a10b-473d-b77c-be9149945f5f/ff3cd56a-1005-4426-8137-8f422c0b47c1/images/ba42cbcc-c068-4df8-af3d-00f2077b1e27/c57acd5f-d6cf-48cc-ad0c-4a7d979c0c1e
-O raw
/rhev/data-center/mnt/glusterSD/10.20.30.41:_rhv__export/81094499-a392-4ea2-b081-7c6288fbb636/images/ba42cbcc-c068-4df8-af3d-00f2077b1e27/c57acd5f-d6cf-48cc-ad0c-4a7d979c0c1e

Any idea how to make it work faster or what throughput should I expected?

Cheers,

Jiri

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