You might wanna try one thing I just noticed - wrap the log device inside a SVM (disksuite) metadevice - makes wonders for the performance on my test server (Sun Fire X4240)... I do wonder what the downsides might be (except for having to fiddle with Disksuite again). Ie:
# zpool create TEST c1t12d0 # format c1t13d0 (Create a 4GB partition 0) # metadb -f -a -c 3 c1t13d0s0 # metainit d0 1 1 c1t13d0s0 # zpool add TEST log /dev/md/dsk/d0 In my case the disks involved above are: c1t12d0 146GB 10krpm SAS disk c1t13d0 32GB Intel X25-E SLC SSD SATA disk Without the log added running 'gtar zxf emacs-22.3.tar.gz' over NFS from another server takes 1:39.2 (almost 2 minutes). With c1t15d0s0 added as log it takes 1:04.2, but with the same c1t15d0s0 added, but wrapped inside a SVM metadevice the same operation takes 10.4 seconds... 1:39 vs 0:10 is a pretty good speedup I think... -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
