On Thu, 21 Mar 2013 11:56:37 -0700 Ask Bjørn Hansen <ask@xxxxxxxxxxxxxx> wrote: > Hello, > > A few weeks ago I replaced a ZFS backup system with one backed by btrfs. A script loops over a bunch of hosts rsyncing them to each their own subvolume. After each rsync I snapshot the "host-specific" subvolume. > > The "disk" is an iscsi disk that in my benchmarks performs roughly like a local raid with 2-3 SATA disks. I think you should re-verify if this is still the case. Maybe your block device performance suddenly plummeted for some other unrelated issue? The simplest test would be "hdparm -t /dev/sdc". Personally I use btrfs on top of an MD raid accessed over network via NBD (and AoE before), without any major issues. Though my workload is perhaps somewhat lighter than what you describe. -- With respect, Roman
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