On Fri, 15 Dec 2006, Andre Majorel wrote:
Pardon the probably silly question but...
Can you use RAID1 devices for your root and swap with a "straight"
kernel ? (i.e. without the need for initrd/initramfs.)
Yes - but you need the md (and ide/scsi/sata) drivers compiled into your
kernel, and make sure the parition types are 0xFD and trust the kernel
auto-detection.
This is how I do it on all my servers. No initrd etc. (apart from the ones
that boot off flash, but thats another story!)
% cat /proc/mdstat
Personalities : [raid0] [raid1]
md1 : active raid1 hdc1[1] hda1[0]
248896 blocks [2/2] [UU]
md2 : active raid1 hdc2[1] hda2[0]
995904 blocks [2/2] [UU]
md3 : active raid1 hdc3[1] hda3[0]
2000000 blocks [2/2] [UU]
md5 : active raid1 hdc5[1] hda5[0]
7815488 blocks [2/2] [UU]
md6 : active raid1 hdc6[1] hda6[0]
68974976 blocks [2/2] [UU]
unused devices: <none>
% lsmod
Module Size Used by
% cat /etc/fstab
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc defaults 0 0
/dev/md1 / ext3 defaults,errors=remount-ro 0 1
/dev/md2 none swap sw 0 0
/dev/md3 /usr ext3 defaults 0 2
/dev/md5 /var ext3 defaults 0 2
/dev/md6 /home ext3 defaults 0 2
If that matters, the boot manager would be LILO and each MD device
would be assembled from "parallel" logical partitions.
Lilo is fine. Even kernel auto-detection is fine for me. A nice little tip
I learned from someone else on the list is to have your md
devices named after the partition numbers. So:
md1 is /dev/hda1 and /dev/hdc1
md2 is /dev/hda2 and /dev/hdc2
etc.
Gordon
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