ZFS melting under postgres...

Kenneth Vestergaard Schmidt kvs at binarysolutions.dk
Fri Dec 14 06:07:24 PST 2007


Dag-Erling Smørgrav <des at des.no> writes:

> Doug Rabson <dfr at rabson.org> writes:
>> Dag-Erling Smørgrav <des at des.no> writes:
>> > David Duchscher <daved at tamu.edu> writes:
>> > > So does anybody know of a battery backed NVRAM card that can be used
>> > > with FreeBSD that the ZIL could be offloaded to?
>> > Any CF card or similar will do.  You don't need battery backup for
>> > flash memory.
>>
>> THis may also have to wait for a future version of ZFS. I remember
>> reading about this kind of thing as an upcoming feature in Solaris. I
>> believe the way this feature would work is that ZFS would allow creating
>> the ZIL on a different pool to the filesystem - i.e. create a zpool on
>> the CF card and get the ZIL to live there.
>
> AFAIK this is already implemented in ZFS, though I'm not sure Pawel has
> merged it into FreeBSD yet.

http://www.opensolaris.org/os/community/zfs/version/7/

You simply add a 'log' vdev to a pool. It's included in snv_75, maybe
earlier.

/Kenneth


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