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.dehen...@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.
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Daniel Dehennin
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C12G Labs - Flexible Enterprise Cloud Made Simple
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