10:20 a.m.
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Von: Karli Sj=F6berg [Karli.Sjoberg(a)slu.se]=0A=
Gesendet: Donnerstag, 9. Januar 2014 08:48=0A=
An: squadra(a)gmail.com=0A=
Cc: users(a)ovirt.org; Markus Stockhausen=0A=
Betreff: Re: [Users] Experience with low cost NFS-Storage as VM-Storage?=
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=0A=
On Thu, 2014-01-09 at 08:35 +0100, squadra wrote:=0A=
Right, try multipathing with nfs :)=0A=
=0A=
Yes, that=B4s what I meant, maybe could have been more clear about that,=
=0A=
sorry. Multipathing (and the load-balancing it brings) is what
really=0A=
separates iSCSI from NFS.=0A=
=0A=
What I=B4d be interested in knowing is at what breaking-point, not having=
=0A=
multipathing becomes an issue. I mean, we might not have such a
big=0A=
VM-park, about 300-400 VMs. But so far running without multipathing=0A=
using good ole' NFS and no performance issues this far. Would be good to=
=0A=
know beforehand if we=B4re headed for a wall of some sorts, and
about=0A=
"when" we=B4ll hit it...=0A=
=0A=
/K=0A=
=0A=
If that is really a concern for the initial question about a "low cost NFS=
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solution" LACP on the NFS filer side will mitigate the bottleneck from =0A=
too many hypervisors. =0A=
=0A=
My personal headache is the I/O performance of QEMU. More details here:=0A=
http://lists.nongnu.org/archive/html/qemu-discuss/2013-12/msg00028.html=0A=
Or to make it short: Each I/O in a VM gets a penalty of 370us. That is much=
=0A=
more than in ESX environments.=0A=
=0A=
I would be interested if this the same in ISCSI setups.=0A=
=0A=
Markus=0A=
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