[ovirt-users] Poor guest write speeds

[Matthew Lagoe]

With zfs you can use sync=disabled to enable async on the storage side as well just fyi.

 

On one of ours we have 18 x 2tb drives across 6 x 3-way-mirrors with 3 intel 7310 ssds 3 way mirrored for zil

 

With about 100 vm’s running I get roughly 1400 iops write and 2230 read with about 600MBps read and 220 write running the tests from a windows 2008 r2 vm.

 

From: Donny Davis [mailto:donny at cloudspin.me] 
Sent: Sunday, August 02, 2015 05:49 PM
To: Matthew Lagoe
Cc: Alan Murrell; users
Subject: Re: [ovirt-users] Poor guest write speeds

 

Thank you for reporting back.

 

I don't have to use async with my NFS share. Its not the same comparison, but just for metrics I am running an

 

 HP dl380 with 2x6cores and 24GB of ram, with 16 disks in raidz2 with 4 vdevs. Backend is ZFS. Connections are 10GBE

 

I get great performance from my setup.

 

On Sat, Aug 1, 2015 at 9:00 PM, Matthew Lagoe <matthew.lagoe at subrigo.net> wrote:

You can run without async so long as your nfs server can handle sync writes
quickly


-----Original Message-----
From: users-bounces at ovirt.org [mailto:users-bounces at ovirt.org] On Behalf Of
Alan Murrell
Sent: Saturday, August 01, 2015 05:37 PM
To: users
Subject: Re: [ovirt-users] Poor guest write speeds

Hi Donny (and everyone else who uses NFS-backed storage)

You mentioned that you get really good performance in oVirt and I am curious
what you use for your NFS options in exportfs?  The 'async'
option fixed my performance issues, but of course this would not be a
recommended option in a production environment, at least unless the NFS
server was running with a BBU on the RAID card.

Just curious.  Thanks! :-)

-Alan

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-- 

Donny Davis

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