On Thu Nov 13, 2008 at 09:46:23AM -0500, Ryan Wagoner wrote:
> I have a RAID 5 array with 3 TB drives. When reading through the list
> I realized that the v0.90 superblock doesn't support arrays over 2TB.
> This means I can never grow this array to 4 drives?
>
That's my understanding, yes.
> Is there a way to convert to the v1.0 superblock? I realize I can't
> convert to the v1.1 or v1.2 without recreating the array. Is there any
> advantages over the v1.1 or v1.2 formats with their placement of the
> metadata not at the start of the device?
>
There's no way to convert superblocks as such. With both the 0.90 and
1.0 superblocks being at the end of the disk, you could probably
recreate the array without losing data though - you may need to shrink
the filesystem in case the 1.0 superblock uses more space than the 0.90
(and I'd definitely test this with loopback devices first).
> I read that the kernel autodetect will not work with v1 superblocks. I
> have my mdadm.conf correctly configured. When booting this should be
> all I need for the array to be assembled? Out of curiosity can v1
> superblocks work on the /boot or / array? I would assume not because
> it would need to be auto configured before the mdadm.conf could be
> read.
>
If this is not the / array then the init scripts should assemble it from
the mdadm.conf file. You can use 1.x superblocks for /boot anyway (as
that's not accessed during boot outside of the bootloader, and that
needs to access the raw disks anyway), and for / if you're using an
initrd (which will contain the mdadm.conf and assemble the array before
switching root).
> Also "v1 supports restarting driver recovery that was interrupted by a
> clean shutdown.". Does this mean that a initial resync or recovery
> will continue and not restart when rebooting?
>
Not sure on this one, I though all versions would continue (if using a
bitmap).
HTH,
Robin
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