ZFS l2arc and HAST ? newbie question

[Jeremy Chadwick]

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 |