Red Hat Bugzilla – Bug 4748
RAID autodetect fails - initrd problem?
Last modified: 2008-05-01 11:37:51 EDT
System: Supermicro P6DGS w/onboard Adaptec 7895, 2 PII-400MHz processors, 256Mb ECC SDRAM, 1 8.4Gb WD IDE, 2 4.5Gb Seagate Barracudas (SCSI). Install: Almost "everything" install onto IDE drive went fine. Identical partitioning of SCSI drive successful. Created /etc/raidtab with md0 through md6, mkraid successful. Shut down RAID, changed partition types to 'fd'. (All this from /usr/doc/raidtools-0.90/Software-RAID.HOWTO.txt). Kernel: Stock RH6.0 vmlinuz-2.2.5-15smp Initrd: Stock RH6.0 initrd-2.2.5-15smp.img Reboot: Adaptec-7895 is found and configured. Both SCSI drives are found and partitioning is correctly reported. Then (using md0 as example, this happens for all mdX): kernel: autodetecting RAID arrays kernel: (read) sda12's sb offset: 256896 [events: 00000002] kernel: (read) sdb12's sb offset: 256896 [events: 00000002] kernel: autorun ... kernel: considering sdb12 ... kernel: adding sdb12 ... kernel: adding sda12 ... kernel: created md0 kernel: bind<sda12,1> kernel: bind<sdb12,2> kernel: running: <sdb12><sda12> kernel: now! kernel: sdb12's event counter: 00000002 kernel: sda12's event counter: 00000002 kernel: kmod: failed to exec /sbin/modprobe -s -k md-personality-3, errno = 2 kernel: do_md_run() returned -22 kernel: unbind<sdb12,1> kernel: export_rdev(sdb12) kernel: unbind<sda12,0> kernel: export_rdev(sda12) kernel: md0 stopped. The problem would appear to be that md-personality-3 is not available at boot from RAM disk. I have not been able to verify this, as all my attempts to mount the initrd file via the loopback device have failed with "wrong fs, bad option, bad superblock on /dev/loop0..." -- so I guess I don't have the necessary knowledge to do this, and I can't find any info on it. Anyway, it appears to me that some modules to support software RAID may need to be added to initrd. This will prove necessary for anyone wanting to have a RAID / partition.
This should be fixed in the latest mkinitrd; in the meantime running: mkinitrd --with=<raid personality modules> should work... ------- Additional Comments From 08/31/99 00:24 ------- Yes. That got the autodetect working. Thank you. I still have not been able to get a RAID / partition working, however. Here's what I did: mount /dev/md0 /mnt/raid tar --one-file-system -cf - / | tar -C /mnt/raid -xvf - changed /mnt/raid/etc/lilo.conf -> root=/dev/md0 changed /mnt/raid/etc/fstab -> /dev/md0 / mounted my /boot partition under /mnt/raid/boot lilo -r /mnt/raid -C /etc/lilo.conf This appears to have worked correctly, as upon reboot /dev/md0 is correctly audodetected and started, I get: fsck: /dev/md0: clean ... rc.sysinit: Checking root filesystem succeeded rc.sysinit: Remounting root file-system in read-write mode succeeded other file systems (not yet raid) successfully mounted then: atd[xxx]: Error redirecting I/O: Permission denied atd: atd startup failed Then, if in runlevel 5: X starts to come up, flashes, fails, and then repeats this indefinitely. I can't switch virtual terminals, but I can telnet in. df shows that /dev/md0 is mounted as root, attempting to run atd logs the same error. Upon shutting down, I get: xfs: shutdown failed atd: shutdown failed The permission denied for atd is perplexing. I poked around a little, and tried changing permissions on /dev/md0 to match other partition devices (ie group -> disk, and 640) with the same result. I'm guessing that if I can solve the atd permission denied problem, that the X problem will go away also. Did I screw up the copy? Everything appears to be correct, w/correct permissions, etc. Device files must be OK, or I wouldn't have gotten this far... Any ideas?
BTW, I'd better mention that I upgraded to the 2.2.5-22smp kernel, That went fine, I did all the necessary mkinitrd and lilo stuff and all works well with a non-RAID / partition. (Although mkbootdisk didn't include the raid personality modules when making the boot floppy). I also installed all other updates except Netscape and Gnome.
mkinitrd has been fixed in Raw Hide to automatically add raid modules.