CentOS List wrote:
CentOS List wrote:
I am running raid 1 on a centos 4.4. One of the harddisk (sda1)
failed. How can i carry on running the server using only sda2?
Generate a grub floppy and use that to load the grub menu from the
sdb (probably now sda) disk.
If you are really talking about sda1 and sda2, those are
partitions on the same disk.
Is there a detail step by step howto? The raid 1 has no LVM. just
md0, md1 and md2. md0 is /boot, md1 is swap and md2 is the storage.
I had replace sba with a new disk. I tried to boot up and it says
kernel panic. How am i going to reconstruct the raid and sync sdb
to sda?
It might be easier to swap the old sdb into the sda position so
you'll boot from it, but you should also be able to boot the install
cd with
If swapped and booted, and got a kernel panic error.
'linux rescue' at the boot prompt, let it detect and mount your
system (which will be the 'broken' raid devices with their single
members),
If i use linux rescue, The 3 mds I created are gone. /cat
/proc/mdstat says Personalitlies: [raid0] [raid1] [raid5] [raid6], no
longer Personalities : [raid1]
Perhaps your raid wasn't really working the way you thought before.
From the rescue boot, does fdisk show the 3 partitions on the old disk
with type 'fd'? Can you mount the old /boot and / partitions
somewhere by hand? You should be able to do this with the /dev/sda1
and /dev/sda3 device names if the md devices aren't detected at boot.
cat /proc/partitions still shows me the 3 partitions.
Does fdisk say that they are type 'fd'(raid autodetect)?
Yes. There are 3 fd (raid autodetect)
I actually copied
/boot to the "replaced disk" and it is able to boot up, but without any
filesystem, so i guess the boot is still intact. So do i need to mount
/boot and /?
If you can get the original partitions to be detected as their md
devices you should fdisk matching partitions on the replacement disk,
then 'mdadm --add ...' to add them and they will automatically sync up.
So I just have to manually add md to the 3 partitions?
regards
_______________________________________________
CentOS mailing list
CentOS@xxxxxxxxxx
http://lists.centos.org/mailman/listinfo/centos
