RFT: ZFS MFC

[Kip Macy]

On Tue, May 26, 2009 at 9:51 AM, Kai Gallasch <gallasch at free.de> wrote:
> Kip Macy wrote:
>> I've MFC'd ZFS v13 to RELENG_7 in a work branch. Please test if you can.
>>
>> http://svn.freebsd.org/base/user/kmacy/ZFS_MFC/
>>
>> The standard disclaimers apply. This has only been lightly tested in a
>> VM. Please do not use it with data you care about at this time.
>>
>
> Hi.
>
> http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/cddl/contrib/opensolaris/common/zfs/zfs_prop.c
>
> So ZFS v13 is now part of RELENG_7 MAIN.
> Did you receive any negative feedback until now?
>
> zpool upgrade:
> Should a ZFS v6 pool be upgraded through 'zpool upgrade' while in use?
>
> loader.conf:
> My old loader.conf (7.2-STABLE-amd64) settings for zfs:
>
> vm.kmem_size="3072M"
> vm.kmem_size_max="3072M"
> vfs.zfs.arc_min="120795878"
> vfs.zfs.arc_max="2899101078"
> # more stability?
> vfs.zfs.prefetch_disable=1
>
> Is there a need to keep the old (painfully found :) known to work
> settings when upgrading from ZFS v6 to v13 on RELENG_7, because in your
> commit message I read: "- the arc now experiences backpressure from the
> vm (which can be too much - but this allows ZFS to work without any
> tunables on amd64)"
>

Machines with less than 4GB, especially those with workloads with poor
locality,  should have prefetch disabled. You should not need the
other tunables on amd64 (i386 is both a lower priority and a harder
problem). When reporting problems report them with the tunables
removed as well as whatever your existing tunables are.


-Kip