[one-users] Performance with system datastore on NFS

[Jaime Melis]

Hi Daniel,

choosing the adequate CACHE option will definitely help. See:
http://opennebula.org/documentation:rel4.4:template#disks_section
http://libvirt.org/formatdomain.html#elementsDevices (look for cache)

cheers,
Jaime


On Wed, Nov 20, 2013 at 4:16 PM, Daniel Dehennin <
daniel.dehennin at baby-gnu.org> wrote:

> Hello,
>
> I just finalize the migration our 3.8.3 ONE to 4.2 and was forced to
> change my plan to put datastore 0 on NFS4 because of slow accesses.
>
> For non persistent images they use local datastore 0, but persistent
> ones use NFS (via the symlink).
>
> All my images are qcow2.
>
> I have a dedicated VLAN for storage access, and my nodes are mounting
> the datastores as:
>
>     10.255.255.2:/one-datastores on /var/lib/one/datastores type nfs4
> (rw,relatime,vers=4,rsize=262144,wsize=262144,namlen=255,hard,proto=tcp,port=0,timeo=600,retrans=2,sec=sys,clientaddr=10.255.255.4,minorversion=0,fsc,local_lock=none,addr=10.255.255.2,_netdev)
>
> I remember seeing a document about different cache scenarios and
> performance but I can not remember where.
>
> My setup is a tree nodes ONE:
>
> - one not very powerfull frontend
> - two quite powerful nodes to run VMs (core i7 + 16Go RAM)
>
> My storage is what they call “workgroup NAS” with dual gigabit nics
> configured in bonding.
>
> I'm wondering about using RAID1+0 instead of the RAID5 to improve disk
> access performances and lower CPU usage.
>
> Any hints or idea?
>
> Regards.
>
> --
> Daniel Dehennin
> Récupérer ma clef GPG:
> gpg --keyserver pgp.mit.edu --recv-keys 0x7A6FE2DF
>
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>


-- 
Jaime Melis
C12G Labs - Flexible Enterprise Cloud Made Simple
http://www.c12g.com | jmelis at c12g.com

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