Hi again Brent Jones wrote: > > Scott, > > Can you tell us the configuration that you're using that is working for you? > Were you using RaidZ, or RaidZ2? I'm wondering what the "sweetspot" is > to get a good compromise in vdevs and usable space/performance >
Some time ago I made some tests to find this: (1) create a new zpool (2) Copy user's home to it (always the same ~ 25 GB IIRC) (3) zfs send to /dev/null (4) evaluate && continue loop I did this for fully mirrored setups, raidz as well as raidz2, the results were mixed: https://n0.aei.uni-hannover.de/cgi-bin/twiki/view/ATLAS/ZFSBenchmarkTest#ZFS_send_performance_relevant_fo The culprit here might be that in retrospect this seemed like a "good" home filesystem, i.e. one which was quite fast. If you don't want to bother with the table: Mirrored setup never exceeded 58 MB/s and was getting faster the more small mirrors you used. RaidZ had its sweetspot with a configuration of '6 6 6 6 6 6 5 5', i.e. 6 or 5 disks per RaidZ and 8 vdevs RaidZ2 finally was best at '10 9 9 9 9', i.e. 5 vdevs but not much worse with only 3, i.e. what we are currently using to get more storage space (gains us about 2 TB/box). Cheers Carsten _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
