10:48 a.m.
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On 11/24/2017 06:41 AM, Sahina Bose wrote:
=20
=20
On Thu, Nov 23, 2017 at 4:56 PM, Ji=C5=99=C3=AD Sl=C3=A9=C5=BEka <jiri.=
slezka(a)slu.cz
<mailto:jiri.slezka@slu.cz>> wrote:
=20
Hi,
=20
On 11/22/2017 07:30 PM, Nir Soffer wrote:
> On Mon, Nov 20, 2017 at 5:22 PM Ji=C5=99=C3=AD Sl=C3=A9=C5=BEka <=
jiri.slezka(a)slu.cz <mailto:jiri.slezka@slu.cz>
> <mailto:jiri.slezka@slu.cz
<mailto:jiri.slezka@slu.cz>>> wrote:
>
>=C2=A0 =C2=A0 =C2=A0Hi,
>
>=C2=A0 =C2=A0 =C2=A0I am trying realize why is exporting of vm to =
export
storage on
>=C2=A0 =C2=A0 =C2=A0glusterfs such slow.
>
>=C2=A0 =C2=A0 =C2=A0I am using oVirt and RHV, both instalations on=
version 4.1.7.
>
>=C2=A0 =C2=A0 =C2=A0Hosts have dedicated nics for rhevm network - =
1gbps,
data
storage itself
>=C2=A0 =C2=A0 =C2=A0is on FC.
>
>=C2=A0 =C2=A0 =C2=A0GlusterFS cluster lives separate on 4 dedicate=
d
hosts. It has
slow disks
>=C2=A0 =C2=A0 =C2=A0but I can achieve about 200-400mbit throughput=
in
other
applications (we
>=C2=A0 =C2=A0 =C2=A0are using it for "cold" data, backups mostly).=
>
>=C2=A0 =C2=A0 =C2=A0I am using this glusterfs cluster as backend f=
or
export
storage. When I
>=C2=A0 =C2=A0 =C2=A0am exporting vm I can see only about 60-80mbit=
throughput.
>
>=C2=A0 =C2=A0 =C2=A0What could be the bottleneck here?
>
>=C2=A0 =C2=A0 =C2=A0Could it be qemu-img utility?
>
>=C2=A0 =C2=A0 =C2=A0vdsm=C2=A0 =C2=A0 =C2=A0 97739=C2=A0 0.3=C2=A0=
0.0
354212 29148 ?=C2=A0 =C2=A0 =C2=A0 =C2=A0 S<l=C2=A0 15:43=C2=A0 =C2=A0=
0:06
>=C2=A0 =C2=A0 =C2=A0/usr/bin/qemu-img convert -p -t none -T
none -=
f raw
>=C2=A0 =C2=A0
=C2=A0/rhev/data-center/2ff6d0ee-a10b-473d-b77c-be9149945f5f/ff3cd5=
6a-1005-4426-8137-8f422c0b47c1/images/ba42cbcc-c068-4df8-af3d-00f2077b1e2=
7/c57acd5f-d6cf-48cc-ad0c-4a7d979c0c1e
>=C2=A0 =C2=A0 =C2=A0-O raw
>=C2=A0 =C2=A0
=C2=A0/rhev/data-center/mnt/glusterSD/10.20.30.41:_rhv__export/8109=
4499-a392-4ea2-b081-7c6288fbb636/images/ba42cbcc-c068-4df8-af3d-00f2077b1=
e27/c57acd5f-d6cf-48cc-ad0c-4a7d979c0c1e
>
>=C2=A0 =C2=A0 =C2=A0Any idea how to make it work faster or what th=
roughput should I
>=C2=A0 =C2=A0 =C2=A0expected?
>
>
> gluster storage operations are using fuse mount - so every write:=
> - travel to the kernel
> - travel back to the gluster fuse helper process
> - travel to all 3 replicas - replication is done on client side
> - return to kernel when all writes succeeded
> - return to caller
>
> So gluster will never set any speed record.
>
> Additionally, you are copying from raw lv on FC - qemu-img cannot=
do
> anything
> smart and avoid copying unused clusters. Instead if copies
gigabytes of
> zeros
> from FC.
=20
ok, it does make sense
=20
> However 7.5-10 MiB/s sounds too slow.
>
> I would try to test with dd - how much time it takes to copy
> the same image from FC to your gluster storage?
>
> dd
> if=3D/rhev/data-center/2ff6d0ee-a10b-473d-b77c-be9149945f5f/ff3cd=
56a-1005-4426-8137-8f422c0b47c1/images/ba42cbcc-c068-4df8-af3d-00f2077b1e=
27/c57acd5f-d6cf-48cc-ad0c-4a7d979c0c1e
>
of=3D/rhev/data-center/mnt/glusterSD/10.20.30.41:_rhv__export/810=
94499-a392-4ea2-b081-7c6288fbb636/__test__
> bs=3D8M oflag=3Ddirect status=3Dprogress
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unfrotunately dd performs the same
=20
1778384896 bytes (1.8 GB) copied, 198.565265 s, 9.0 MB/s
=20
=20
> If dd can do this faster, please ask on qemu-discuss mailing list=
:
> https://lists.nongnu.org/mailman/listinfo/qemu-discuss
<https://lists.nongnu.org/mailman/listinfo/qemu-discuss>
>
> If both give similar results, I think asking in gluster mailing l=
ist
> about this can help. Maybe your gluster setup can be
optimized.
=20
ok, this is definitly on the gluster side. Thanks for your guidance=
=2E
=20
I will investigate the gluster side and also will try Export on NFS=
share.
=20
=20
[Adding gluster users ml]
=20
Please provide "gluster volume info" output for the rhv_export gluster
volume and also volume profile details (refer to earlier mail from Shan=
i
on how to run this) while performing the dd operation above.
you can find all this output on https://pastebin.com/sBK01VS8
as mentioned in other posts. Gluster cluster uses really slow (green)
disks but without direct io it can achieve throughput around 400mbit/s.
This storage is used mostly for backup purposes. It is not used as a vm
storage.
In my case it would be nice not to use direct io in export case but I
understand why it might not be wise.
Cheers,
Jiri
=20
=C2=A0
=20
=20
Cheers,
=20
Jiri
=20
=20
>
> Nir
> =C2=A0
>
>
>=C2=A0 =C2=A0 =C2=A0Cheers,
>
>=C2=A0 =C2=A0 =C2=A0Jiri
>
>
>=C2=A0 =C2=A0 =C2=A0______________________________________________=
_
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>=C2=A0 =C2=A0 =C2=A0Users(a)ovirt.org <mailto:Users@ovirt.org>
<mailto:Users@ovirt.org <mailto:Users@ovirt.org>>
>=C2=A0 =C2=A0 =C2=A0http://lists.ovirt.org/mailman/listinfo/users
<http://lists.ovirt.org/mailman/listinfo/users>
>
=20
=20
=20
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