On 06 March, 2007 - Matt B sent me these 2,5K bytes: > I am trying to determine the best way to move forward with about 35 x86 > X4200's > Each box has 4x 73GB internal drives. > > This would leave each disk with 64GB of free space, totaling 256GB. I > would then create a single ZFS pool of all the remaining freespace on > each of the 4 disks. > > How should this be done? > > Perhaps a form of mirring? What would be the difference in doing? > zpool create tank mirror c1d0 c2d0 c3d0 c4d0
64GB usable space, any 3 disks can die. > or > zpool create tank mirror c1d0 c2d0 mirror c3d0 c4d0 128GB usable space, 1-2 disks can die. > Would it be better to use RaidZ with a hotspare or RAIDZ2 Raidz + hotspare: 128GB usable space, 1 disk can die .. <pause and hope that nothing bad happens, wait for resilver> .. 1 more disk can die.. raidz2: 128GB usable space, any 2 disks can die at the same time. > I would like /data, /home, and /var to be able to grow as needed and > be able to withstand at least 2 disk failures (doesn't have to be any > 2). I am open to using a hotspare 4 way mirror has highest read performance, then 2+2, then probably raidz and finally raidz2. It all depends on your tradeoff of security vs space vs performance. http://blogs.sun.com/roch/entry/when_to_and_not_to http://blogs.sun.com/relling/entry/zfs_raid_recommendations_space_performance /Tomas -- Tomas Ögren, [EMAIL PROTECTED], http://www.acc.umu.se/~stric/ |- Student at Computing Science, University of Umeå `- Sysadmin at {cs,acc}.umu.se _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
