On February 8, 2009 12:04:22 AM +0530 Sriram Narayanan <sri...@belenix.org> wrote: >> From the presentation "ZFS - The last word in filesystems", Page 22 > "In a multi-disk pool, ZFS survives any non-consecutive disk failures" > > Questions: > If I have a 3 disk RAIDZ with disks A, B and C, then: > - if disk b fails, then will I be able to continue to read data if > disks A and C are still available ?
yes. raidz allows for 1 disk failure. > If I have a 4 disk RAIDZ with disks A, B, C, and D, then: > - if disks a and b fail, then I won't be able to read from the mirror > any more. Is this understanding correct ? what mirror? there is no mirror. you have a raidz. you can have 1 disk failure. > - if disks a and c fail, then I will be be able to read from disks b > and d. Is this understanding correct ? no. you will lose all the data if 2 disks fail. The part of the slides you are referring to is in reference to ditto blocks, which allow failure of PARTS of a SINGLE disk. -frank _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
