Using ZFS as RAID0 - disk offline question

[Simon]

This isn't really ZFS related, rather just RAID The answer would apply to any
standard implementation of RAID0 which is nothing more than striping across
multiple disks. Should you sustain a disk failure in RAID0, you will lose all your
data.

Check out http://en.wikipedia.org/wiki/Standard_RAID_levels

-Simon

On Mon, 04 Jun 2012 21:00:15 +0100, Kaya Saman wrote:

>Hi,

>in ZFS when using a simple RAID 0 style array is there a way to recover 
>a pool after a disk has gone down?

>Or remove a disk from the pool to shrink it?


>To be more specific this is what I'm simulating at the moment:


>zpool create ZPOOL_1 /mnt/disk1 /mnt/disk2

>zpool status shows disk1 and disk2 as being part of ZPOOL_1 and ZPOOL_1 
>is ONLINE.


>However, if I should ever want to remove disk2 from the pool or if disk2 
>has gone down how would one go about getting the ZPOOL_1 back online?


>I am hoping that there is a solution to just running the pool with 1 disk.


>Or if the disk name changes ie. simulating a disk number to change after 
>moving it to a different controller or so internally.

>I am just trying to see what would happen as RAIDZ or RAID1 is very good 
>however what about RAID0 in the situation above.


>I guess one could call this as disaster recovery for the unprepared :-)


>In actual fact I have done this physically on a Mini-ITX NAS system (of 
>course I have backups of everything) however, my point is to try to see 
>if one disk goes down if the ZPOOL will still be able to function 
>without the additional disk! - as commands such as remove and detach are 
>unavailable in this mode......


>Regards,


>Kaya
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