I've read the FAQ, the Howtos, and innumerable other online
resources, but I haven't been able to nail down this problem, so I
hope someone out there isn't on holiday vacation and can lend a hand.
I'm trying to finish configuring this box so I can drop it into a
colocate on Thursday (I know, cutting it close).
I have a raid1 that was configured by the Redhat GUI installer on two
9GB scsi drives. I'm able to boot from this raid (md0-2) without
problems, under normal conditions.
However, I'm only able to boot if both members of md0 are online
(sda1 and sdb1). If either member is offline (they are sca drives in
removable sleds, thus easily taken offline), I get stuck at "LI" on
boot.
This doesn't do me much good, because in this configuration I'm
toasted if either member of my boot raid goes offline. Twice the
risk for only twice the price, great... :/
I could really use some help with this one. The solution seems very
close to what I have now, but I sure can't find it... I've been
beating on this for about 12 hours straight and am getting nowhere
fast.
Redhat 7.0, kernel 2.2.16-22enterprise, dual P3-550, onboard Adaptec
AIC-7896 U2W, SCA backplane with 4 sled bays.
--- raidtab: ---
raiddev /dev/md0
raid-level 1
nr-raid-disks 2
chunk-size 64k
persistent-superblock 1
#nr-spare-disks 0
device /dev/sda1
raid-disk 0
device /dev/sdb1
raid-disk 1
raiddev /dev/md1
raid-level 1
nr-raid-disks 2
chunk-size 64k
persistent-superblock 1
#nr-spare-disks 0
device /dev/sdc1
raid-disk 0
device /dev/sdd1
raid-disk 1
raiddev /dev/md2
raid-level 1
nr-raid-disks 2
chunk-size 64k
persistent-superblock 1
#nr-spare-disks 0
device /dev/sda5
raid-disk 0
device /dev/sdb5
raid-disk 1
I started with a much simpler lilo file, but after reading tons of
other posts, howtos, and mini-howtos, I added a few more commands
that, while they didn't seem to hurt, also don't appear to solve my
problem.
How can I tell what the proper "start=" parameter should be? Most
examples I saw showed it being the same as sectors, but then I saw
one that was one less than the cylinder count... The SHC values were
pulled from fdisk -ul /dev/sda as described in the boot+raid howto.
Some of the docs suggest that partition is required, but must be a
dummy value. Is this still the case with lilo 21.4-4 (the version
I'm using)?
Is an "other" image still required? I'm guessing not, since I don't
see any complaints about it's absence.
I read about setting a default value solving the "LI" problem, but it
didn't work for me.
--- lilo.conf.sda: ---
disk=/dev/md0
bios=0x80
sectors=63
heads=255
cylinders=254
partition=/dev/md4
start=63
boot=/dev/sda
lba32
map=/boot/map
install=/boot/boot.b
timeout=50
message=/boot/message
delay=30
default=linux
image=/boot/vmlinuz-2.2.16-22enterprise
label=linux
initrd=/boot/initrd-2.2.16-22enterprise.img
read-only
root=/dev/md0
--- lilo.conf.sdb: ---
disk=/dev/md0
bios=0x80 (should this be 0x81 for modern hardware, less than 1 yr old?)
sectors=63
heads=255
cylinders=254
partition=/dev/md4
start=63
boot=/dev/sdb
lba32
map=/boot/map
install=/boot/boot.b
prompt
timeout=50
message=/boot/message
delay=30
default=linux
image=/boot/vmlinuz-2.2.16-22enterprise
label=linux
initrd=/boot/initrd-2.2.16-22enterprise.img
read-only
root=/dev/md0
Both lilo's were properly committed using 'lilo -C lilo.conf.sd[a,b]'
--- cat /proc/mdstat ---
Personalities : [raid1]
read_ahead 1024 sectors
md0 : active raid1 sdb1[0] sda1[1] 2048192 blocks [2/2] [UU]
md2 : active raid1 sdb5[1] sda5[0] 4787264 blocks [2/2] [UU]
md1 : active raid1 sdd1[1] sdc1[0] 17775808 blocks [2/2] [UU]
unused devices: <none>
--- fstab (truncated) ---
/dev/md0 / ext2 defaults 1 1
/dev/md1 /home ext2 defaults 1 2
/dev/md2 /var ext2 defaults 1 2
Based on the above, what do I need to change in order to gracefully
recover from a disk failure?
Any assistance would be greatly appreciated.
Thanks,
Dale
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