[ale] Striping

[Jason Boyles]

On Mon, Jun 08, 1998 at 08:20:50AM -0400, Dan Newcombe wrote:
> > I've never seen it done where the root (/) partition was on a md device...
> > basically cause the md support isn't load'd till the kernel is load'd into
> > memory...
> However, as the kernel is in memory before the root filesystem is even
> mounted, I don't see why this would be a problem, unless a) it is a module
> or b) there are extra utilities needed off the filesystem to kickstart a md
> setup.

MD in 2.1.105ac5, at least, supports an md device as root.
Not sure about 2.1.106 yet.


>You can boot (if you selected boot support in the configuration) with your md
>device with the following kernel command line:
>
>md=<md device no.>,<raid level>,<chunk size factor>,<fault level>,dev0,dev1,...,
>devn
>
>md device no. = the number of the md device ...
>              0 means md0,
>              1 md1,
>              2 md2,
>              3 md3,
>              4 md4
>
>raid level = -1 linear mode
>              0 striped mode
>              other modes are currently unsupported.
>
>chunk size factor = (raid-0 and raid-1 only)
>              Set  the chunk size as PAGE_SIZE << n.
>
>fault level = (raid-1 only)
>              Set  the maximum fault number as n.
>              Currently unsupported due to lack of boot support for raid1.
>
>dev0-devn: e.g. /dev/hda1,/dev/hdc1,/dev/sda1,/dev/sdb1
>
>my loadlin line looks like this:
>
>e:\loadlin\loadlin e:\zimage root=/dev/md0 md=0,0,4,0,/dev/hdb2,/dev/hdc3 ro
>
>        Harald Hoyer <HarryH at Royal.Net>


----
Jason Boyles <jason at alltel.net>