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:do...@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.la...@subrigo.net> wrote: You can run without async so long as your nfs server can handle sync writes quickly -----Original Message----- From: users-boun...@ovirt.org [mailto:users-boun...@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 _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users _______________________________________________ Users mailing list Users@ovirt.org http://lists.ovirt.org/mailman/listinfo/users -- Donny Davis
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