-----Original Message-----
From: fedora-list-bounces@xxxxxxxxxx on behalf of Dave Ihnat
Sent: Fri 09/28/2007 09:13 AM
To: Alan Cox
Cc: For users of Fedora
Subject: Re: How to get the most out of HD space.
On Fri, Sep 28, 2007 at 02:07:20PM +0100, Alan Cox wrote:
> You can boot from raid1 - but of course its actually booting from the one
> disk in reality not from the mirrored set.
Ah--*software* RAID1? At boot time, it doesn't know about /dev/mdX.
---------------------------
I'm pretty sure the system does know about /dev/mdX at boot time... I'm looking at one of my old RHL 9 servers (Yes... it's due for an upgrade!) and my filesystems are laid out as:
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/md0 8160056 4111096 3634452 54% /
/dev/md2 19891 6232 12632 34% /boot
/dev/md3 108963128 101667576 1760508 99% /disk0
and grub.conf says:
default=0
timeout=10
splashimage=(hd0,0)/grub/splash.xpm.gz
title Red Hat Linux (2.4.20-31.9)
root (hd0,0)
kernel /vmlinuz-2.4.20-31.9 ro root=/dev/md0
initrd /initrd-2.4.20-31.9.img
and the fdisk output:
Disk /dev/hdg: 122.9 GB, 122942324736 bytes
16 heads, 63 sectors/track, 238216 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Device Boot Start End Blocks Id System
/dev/hdg1 * 1 41 20632+ fd Linux raid autodetect
/dev/hdg2 42 16490 8290296 fd Linux raid autodetect
/dev/hdg3 16491 18571 1048824 fd Linux raid autodetect
/dev/hdg4 18572 238216 110701080 f Win95 Ext'd (LBA)
/dev/hdg5 18572 238216 110701048+ fd Linux raid autodetect
Disk /dev/hde: 122.9 GB, 122942324736 bytes
16 heads, 63 sectors/track, 238216 cylinders
Units = cylinders of 1008 * 512 = 516096 bytes
Device Boot Start End Blocks Id System
/dev/hde1 * 1 41 20632+ fd Linux raid autodetect
/dev/hde2 42 16490 8290296 fd Linux raid autodetect
/dev/hde3 16491 18571 1048824 fd Linux raid autodetect
/dev/hde4 18572 238216 110701080 f Win95 Ext'd (LBA)
/dev/hde5 18572 238216 110701048+ fd Linux raid autodetect
and, now, re-reading my email... since grub says "root (hd0,0)" does that indicate that it is only going to read hdg at boot time? If I were to create a second boot option in grub.conf with "root (hd1,0)", then could I get it to boot from hde? I guess there would also have to be a way to tell the BIOS to look at hde for the MBR?
Sorry for raising more questions than answers!
<<winmail.dat>>
