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Re: Multiple RAID or encrypted partitions



On Sat, 2006-09-09 at 00:32 +1000, Paul Dwerryhouse wrote:
> On Wed, Sep 06, 2006 at 05:43:36PM -0500, Owen Heisler wrote:
> > I am wondering if there is any reason why the Debian installer doesn't
> > allow multiple partitions in a RAID5 array 
> 
> Create a raid 5 array of the whole disk set and then put LVM across it. You
> can then create logical volumes within the LVM volume group, and these
> are the equivalent of partitions. 
> 
> Remember to have a non raid 5 partition for /boot (eg, either RAID1 or
> just a plain disk partition (ugh)), because IIRC, neither grub nor lilo
> can cope with booting from software RAID5.

Okay, how about this (hopefully it makes sense):

sda1
 raid1
 raid5
sda2
 raid1
 raid5
sda3
 raid1
 raid5

md0 (raid1)
 ext3  /boot

md1 (raid5)
 crypt

crypt (md1)
 LVM

LVM
 ext3  /
 swap


So the 2 logical volumes are in a volume group which is on a dmcrypt partition
which is on a RAID5 volume.

That is a mess, and looks like trouble.  I tried it though, and the encryption
setup fails, with an error that the swap space is unsafe.  It looks safe to me...

Still, I'd rather just put two partitions in a dmcrypt volume.  Debian-installer
won't let me.  Will is be possible later?  Is it possible in the first place?



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