On Saturday 22 October 2005 11:52 am, Juraj Holtak wrote:
> I know I can use the "new" drive I bought today as spare, but I really
> miss the point of a spare for raid1. I think, it makes much more sense,
> to build in the drive as a live one, so instead of RAID1 made of 2
> drives, I`ll get RAID1 made of 3 drives.
>
> I use mdadm to manage the drives. If I use --manage --add and add the
> drive(partition) to the array, it becomes a spare disk and this is not
> what I want it to do.
>
> Is there a way to upgrade my raid, without destroying data?
Indeed. Check mdadm --grow:
Usage: mdadm --grow device options
This usage causes mdadm to attempt to reconfigure a running array.
This is only possibly if the kernel being used supports a particular
reconfiguration. This version only supports changing the number of
devices in a RAID1, and changing the active size of all devices in
a RAID1/4/5/6.
Options that are valid with the grow (-G --grow) mode are:
--size= -z : Change the active size of devices in an array.
: This is useful if all devices have been replaced
: with larger devices.
--raid-disks= -n : Change the number of active devices in a RAID1
: array.
I haven't done it before personally, but I'd imagine:
mdadm --grow /dev/md0 --raid-disks=3
would be a good start (if not the total solution).
Cheers,
Chase
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