On 3/23/07, John-Paul Drawneek <[EMAIL PROTECTED]> wrote: I've got the same consideration at the moment.
Should i do 9 disk raidz2 with a spare, or could i do two raidz2 to get a
bit of performance? Only done tests with striped mirrors which seems to give it a boost, so is it worth it with a raidz2 of this small size?
10 disks with two raidz2 pools leaves no room for a spare. You get 6 disks of storage and can lose any two disks before worrying. With Raid 10 you get 5 disks of storage and can loss anyone disk before worrying, but get better performance. I've thought about get the following: Raidz2 over 5 disks and Raid 10 over 4 disks with one spare. Use the mirror for small random read stuff, like maildir and use the raidz2 pool for iscsi system images. See also: http://www.solarisinternals.com/wiki/index.php/ZFS_Best_Practices_Guide#Should_I_Configure_a_RAID-Z.2C_RAID-Z2.2C_or_a_Mirrored_Storage_Pool.3F and http://blogs.sun.com/roch/date/20060531 - WHEN TO (AND NOT TO) USE RAID-Z and http://blogs.sun.com/relling/entry/zfs_raid_recommendations_space_performance Nicholas
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