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Re: mdadm - two questions



> Unfortunately I cannot see how from raid1 of 2*1TB disks migrate to
> raid1(raid10?)  of 4*1TB disks

I don't think you can reshape a RAID 1 to a RAID 10.

mdadm can reshape RAID 1/5/6. You can move from RAID 5 to 6 or the other way around.
*Maybe* you can even reshape from 1 to RAID 5/6.

I see these options:

* create a second RAID 1 with the new devices, make this a pv and add it to your vg
* backup all data, create a RAID 10/5/6 with all four devices
* Test if you can reshape from RAID 1 to 5/6

The last option only if RAID 5/6 serves your needs.

Regards,
Jens


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