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 < [email protected]> 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 > > _______________________________________________ > Users mailing list > [email protected] > http://lists.opennebula.org/listinfo.cgi/users-opennebula.org > > -- Jaime Melis C12G Labs - Flexible Enterprise Cloud Made Simple http://www.c12g.com | [email protected] -- Confidentiality Warning: The information contained in this e-mail and any accompanying documents, unless otherwise expressly indicated, is confidential and privileged, and is intended solely for the person and/or entity to whom it is addressed (i.e. those identified in the "To" and "cc" box). They are the property of C12G Labs S.L.. Unauthorized distribution, review, use, disclosure, or copying of this communication, or any part thereof, is strictly prohibited and may be unlawful. If you have received this e-mail in error, please notify us immediately by e-mail at [email protected] and delete the e-mail and attachments and any copy from your system. C12G's thanks you for your cooperation.
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