ZFS performance as the FS fills up?
tevans.uk at googlemail.com
Wed Mar 9 13:28:52 UTC 2011
On Wed, Mar 9, 2011 at 12:51 PM, Jeremy Chadwick
<freebsd at jdc.parodius.com> wrote:
> Otherwise, I can imagine that prefetching could cause what you describe,
> which is enabled by default in 8.0 and 8.1 and auto-disables in 8.2 if
> the amount of available memory is less than 4GB.
I don't think this is accurate. Prefetch was certainly disabled by
default on 8.0 if you had 4GB of RAM or less, requiring the sysctl
vfs.zfs.prefetch_disable=0 to be set if you wanted prefetch and had
4GB of RAM or less.
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