>Dear Admin >u said: >choose a 3-disk RAID-1 or a 4-disk RAID10 >set for tank over RAIDZ aWith a 3-disk mirror you'd have a disk left over >to be hot spare for failure in either rpool or tank. >why do u prefer raid1 with one spare rather than raidz? >i heard raidz has better redundancy than raid 1 or 5?! >doesnt raidz support failover when one of my disk crach? >Regards[/i]
A RAIDZ set would allow 1 disk failure before it becomes non-redundant and if a 2nd disk fails you would lose all data. RAIDZ is similar to RAID5 in that it only takes a double-disk failure to lose everything. Of course you could have RAIDZ2 which is akin to RAID6. A 3-disk mirror set with 2 disks failing you would still have data. You need to read more on RAID terminology. Twice in my career I have had 2 disks fail in a RAID5 set before a hot spare could be added and all data was lost. Perfect paranoia is perfect awareness. -- This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
