Messages in this thread | | | From | "Alok K. Dhir" <> | Subject | Autostart RAID 1+0 (root) | Date | Fri, 18 Jan 2002 11:40:55 -0500 |
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Hey all - I may be trying to do the impossible here, but here goes:
I want to test using a software RAID 1+0 partition as root: md0 and md1 set up as mirrors between two disks each, and md2 set up as a stripe between md0 and md1. However, the RedHat 7.2 installer doesn't allow creating nested RAID partitions.
Being stubborn, I installed the OS onto a separate 4 gig disk, installed all the latest patches+fixes to the OS, including the RH2.4.9-13 kernel, then created md0, md1, and md2. I formatted md2 with reiserfs. No problem so far.
Next, I copied the entire contents of the root partition onto md2, changed the relevant line of /boot/grub/grub.conf from:
kernel /vmlinuz-2.4.9-13 ro root=/dev/sda2
To:
kernel /vmlinuz-2.4.9-13 ro root=/dev/md2
Changed fstab so "/" points to /dev/md2 as well, crossed my fingers, and rebooted.
No luck. I get a "cannot mount root" error.
Attempting to speed read the boot messages before I get the panic, it appears that md0 and md1 are autostarted, but it doesn't look like md2 is.
Does the kernel support autostarting nested RAID partitions?
Is doing software 1+0 a bad idea anyway due to performance issues?
Any ideas?
Thanks!
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