Simon Hobson wrote:
Is it normal for the target of a backup to show 100% wait-io during a
backup ?
Both systems are guests on a Xen host with a 4core 2.4G processor and
plenty of ram (the target currently has over 1G free). rdiff-backup is
ver 1.2.1
I dunno about fixing rdiff-backup in this instance - strace will show
you what it is doing pretty clearly.
However, as for your combination, I found that the network and I/O
scheduler in Xen was a single pipeline and contention was terrible. We
got terrible performance when we used network block devices with Xen, as
the VMs would just sit in waitI/O all the time when accessing the
network block devices (we tried AoE, NBD, iSCSI).
Also, use dstat in and out of the vm to analyse the throughput. I found
that Xen just couldn't measure up when using network block devices as
storage (primary storage or additional).
We ended up moving to OpenVZ and haven't looked back.
thanks
dave
_______________________________________________
rdiff-backup-users mailing list at [email protected]
http://lists.nongnu.org/mailman/listinfo/rdiff-backup-users
Wiki URL: http://rdiff-backup.solutionsfirst.com.au/index.php/RdiffBackupWiki
