ZFS l2arc and HAST ? newbie question
Jeremy Chadwick
freebsd at jdc.parodius.com
Tue Jun 15 14:04:18 UTC 2010
On Tue, Jun 15, 2010 at 03:21:45PM +0200, Thomas Steen Rasmussen wrote:
> But what about slog and cache devices, currently on SSD disks for
> performance reasons ? It doesn't really make sense to synchronize
> a cache disk over the network, does it ?
>
> Could I build the zpool with the SSD disks directly (without
> HAST) and would ZFS survive an export/import on the other host,
> when the cache disks are suddently different ? I am thinking cache
> only here, not slog.
Taken from zpool(8):
If a read error is encountered on a cache device, that read I/O is
reissued to the original storage pool device, which might be part
of a mirrored or raidz configuration.
The content of the cache devices is considered volatile, as is the
case with other system caches.
So I would say use the local system's SSDs for "cache" and leave the
rest for HAST.
With regards to "Intent Logs" -- I simply do not know.
--
| Jeremy Chadwick jdc at parodius.com |
| Parodius Networking http://www.parodius.com/ |
| UNIX Systems Administrator Mountain View, CA, USA |
| Making life hard for others since 1977. PGP: 4BD6C0CB |
More information about the freebsd-fs
mailing list