Date: Tue, 15 Jun 2010 07:04:16 -0700 From: Jeremy Chadwick <freebsd@jdc.parodius.com> To: Thomas Steen Rasmussen <thomas@gibfest.dk> Cc: freebsd-fs@freebsd.org Subject: Re: ZFS l2arc and HAST ? newbie question Message-ID: <20100615140416.GA48384@icarus.home.lan> In-Reply-To: <4C177E69.3020204@gibfest.dk> References: <4C177E69.3020204@gibfest.dk>
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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@parodius.com | | Parodius Networking http://www.parodius.com/ | | UNIX Systems Administrator Mountain View, CA, USA | | Making life hard for others since 1977. PGP: 4BD6C0CB |
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