On Aug 4, 2010, at 9:20 AM, Roch <roch.bourbonn...@sun.com> wrote: > > > Ross Asks: > So on that note, ZFS should disable the disks' write cache, > not enable them despite ZFS's COW properties because it > should be resilient. > > No, because ZFS builds resiliency on top of unreliable parts. it's able to > deal > with contained failures (lost state) of the disk write cache. > > It can then export LUNS that have WC enabled or > disabled. But if we enable the WC on the exported LUNS, then > the consumer of these LUNS must be able to say the same. > The discussion at that level then needs to focus on failure groups. > > > Ross also Said : > I asked this question earlier, but got no answer: while an > iSCSI target is presented WCE does it respect the flush > command? > > Yes. I would like to say "obviously" but it's been anything > but.
Sorry to probe further, but can you expand on but... Just if we had a bunch of zvols exported via iSCSI to another Solaris box which used them to form another zpool and had WCE turned on would it be reliable? -Ross _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
