On Fri, Jul 2, 2010 at 1:18 AM, Ray Van Dolson <rvandol...@esri.com> wrote:
> We have a server with a couple X-25E's and a bunch of larger SATA > disks. > > To save space, we want to install Solaris 10 (our install is only about > 1.4GB) to the X-25E's and use the remaining space on the SSD's for ZIL > attached to a zpool created from the SATA drives. > > Currently we do this by installing the OS using SVM+UFS (to mirror the > OS between the two SSD's) and then using the remaining space on a slice > as ZIL for the larger SATA-based zpool. > > However, SVM+UFS is more annoying to work with as far as LiveUpgrade is > concerned. We'd love to use a ZFS root, but that requires that the > entire SSD be dedicated as an rpool leaving no space for ZIL. Or does > it? > > It appears that we could do a: > > # zfs create -V 24G rpool/zil > > I would avoid it for now, I have been bitten by a volume becoming unavailable after multiple storms rolling through my area having the system crash multiple times, i had used volume in the root pool for a zil on another pool, while i was unable able to get these two pools back up after hours of work, I still have no access to a raidz pool that has multiple volumes used for l2arc and log devices, one of the volumes is unaccessible it cant even be snapshotted to recover the data. So the pool of 1.5TB of data sits unimportance until a way of disabling log and l2arc devices on pool import is implemented. > On our rpool and then: > > # zpool add satapool log /dev/zvol/dsk/rpool/zil > > (I realize 24G is probably far more than a ZIL device will ever need) > > As rpool is mirrored, this would also take care of redundancy for the > ZIL as well. > > This lets us have a nifty ZFS rpool for simplified LiveUpgrades and a > fast SSD-based ZIL for our SATA zpool as well... > > What are the downsides to doing this? Will there be a noticeable > performance hit? > > I know I've seen this discussed here before, but wasn't able to come up > with the right search terms... > > Thanks, > Ray > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >
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