Hello Robin ,
On Fri, 12 Feb 2010, Robin Hill wrote:
On Thu Feb 11, 2010 at 05:52:41PM -0800, Michael Evans wrote:
On Thu, Feb 11, 2010 at 3:00 PM, Justin Piszcz <jpiszcz@xxxxxxxxxxxxxxx> wrote:
Hi,
I may be converting a host to ext4 and was curious, is 0.90 still the only
superblock version for mdadm/raid-1 that you can boot from without having to
create an initrd/etc?
Are there any benefits to using a superblock > 0.90 for a raid-1 boot volume
< 2TB?
Justin.
You need the superblock at the end of the partition: If you read the
manual that is clearly either version 0.90 OR 1.0 (NOT 1.1 and also
NOT 1.2; those use the same superblock layout but different
locations).
You also need it to be auto-assembled by the kernel, which is only
version 0.90.
As for benefits, there's a number of benefits of 1.x over 0.90 - I don't
think any of them are terribly important for a small boot partition
though. There's also benefits to having an initrd anyway.
Cheers,
Robin
One can use the 'append=""' functionality of lilo & I am user that
Grub2(and family) has some method of doing the same .
ie:
append=" md=1,/dev/sda1,/dev/sdb1,/dev/sdc1,/dev/sdd1 md=2,/dev/sda2,/dev/sdb2,/dev/sdc2,/dev/sdd2 md=3,/dev/sda3,/dev/sdb3 md=4,/dev/sda4,/dev/sdb4 vt.default_utf8=0 sysrq_always_enabled=1"
Not sure if this would be usable with a 1.1+ version of the MD headers .
I'd really like to see a REAL case that shows a good example of the use
of initrd that absolutely can NOT be done only because of someones
unwillingness to create it in the kernel or to allow others too .
Hth , JimL
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