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 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
