ZFS - moving from a zraid1 to zraid2 pool with 1.5tb disks

[Gót András]

Hi,

I think it's enough to have 2 parity drives with raidz2. If a drive fails
another two has to fail for data loss. However, keep in mind that raid (in
any form) is not instead of backups.

I have a setup where a 8TB RAID5 is the main backup and serves as file
server for not important things AND there's a 3TB RAID5 in a different
machine for secondary backups.

Regards,
Andras


On Thu, 30 Dec 2010 12:40:00 +0100, Damien Fleuriot <ml at my.gd> wrote:
> Hello list,
> 
> 
> 
> I currently have a ZFS zraid1 with 4x 1.5TB drives.
> The system is a zfs-only FreeBSD 8.1 with zfs version 14.
> 
> I am concerned that in the event a drive fails, I won't be able to
> repair the disks in time before another actually fails.
> 
> 
> 
> 
> I wish to reinstall the OS on a dedicated drive (possibly SSD, doesn't
> matter, likely UFS) and dedicate the 1.5tb disks to storage only.
> 
> I have ordered 5x new drives and would like to create a new zraid2
> mirrored pool.
> 
> Then I plan on moving data from pool1 to pool2, removing drives from
> pool1 and adding them to pool2.
> 
> 
> 
> My questions are as follows:
> 
> With a total of 9x 1.5TB drives, should I be using zraid3 instead of
> zraid2 ? I will not be able to add any more drives so unnecessary parity
> drives = less storage room.
> 
> What are the steps for properly removing my drives from the zraid1 pool
> and inserting them in the zraid2 pool ?
> 
> 
> Regards,
> 
> 
> dfl
> 
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