Le vendredi 03 janvier 2014 à 09:46 -0600, Carl Cravens a écrit : > The VM isn't an issue (my BackupPC has run in a KVM guest for over two > years), but using "file-based" storage (a filesystem inside a file stored on > another filesystem) is extremely inefficient (we recently ran benchmarks on > file versus raw device... the performance is awful in comparison). > > Use a raw device (raw disk, LVM volume, etc) with the virtio driver. Your OS > and backup storage can reside on the same raw device, or they can be separate > raw devices, or if you insist, the OS can be virtual file storage. We just > use raw devices (LVM logical volumes) for everything. > > My disk configuration looks like this (virsh dumpxml <guestname>): > > <disk type='block' device='disk'> > <driver name='qemu' type='raw'/> > <source dev='/dev/diskbackup/diskbackup'/> > <target dev='vda' bus='virtio'/> > <alias name='virtio-disk0'/> > <address type='pci' domain='0x0000' bus='0x00' slot='0x04' > function='0x0'/> > </disk> > > "/dev/diskbackup/diskbackup" is a logical volume named "diskbackup" in a > volume group named "diskbackup". (I didn't configure this... traditionally, > this would be "/dev/vgdiskbackup/lvdiskbackup" or such.) >
Morning, to boost I/O performance you can also activate the memory cache over the virtual disk into KVM this configuration give you performance like native one (without virtualisation) there is a limitation: - live migration between kvm hosts is not possible as i know. - As every time cache is used in case of power outage there is a possibility of lost data mna. ------------------------------------------------------------------------------ Rapidly troubleshoot problems before they affect your business. Most IT organizations don't have a clear picture of how application performance affects their revenue. With AppDynamics, you get 100% visibility into your Java,.NET, & PHP application. Start your 15-day FREE TRIAL of AppDynamics Pro! http://pubads.g.doubleclick.net/gampad/clk?id=84349831&iu=/4140/ostg.clktrk _______________________________________________ BackupPC-users mailing list BackupPC-users@lists.sourceforge.net List: https://lists.sourceforge.net/lists/listinfo/backuppc-users Wiki: http://backuppc.wiki.sourceforge.net Project: http://backuppc.sourceforge.net/
