On 9/1/2011 10:24 PM, Simon Matthews wrote:
On Thu, Sep 1, 2011 at 10:51 AM, Timothy D. Lenz<tlenz@xxxxxxxxxx> wrote:
On 8/26/2011 3:45 PM, NeilBrown wrote:
On Fri, 26 Aug 2011 13:13:01 -0700 "Timothy D. Lenz"<tlenz@xxxxxxxxxx>
wrote:
I have 4 drives set up as 2 pairs. The first part has 3 partitions on
it and it seems 1 of those drives is failing (going to have to figure
out which drive it is too so I don't pull the wrong one out of the case)
It's been awhile since I had to replace a drive in the array and my
notes are a bit confusing. I'm not sure which I need to use to remove
the drive:
sudo mdadm --manage /dev/md0 --fail /dev/sdb
sudo mdadm --manage /dev/md0 --remove /dev/sdb
sudo mdadm --manage /dev/md1 --fail /dev/sdb
sudo mdadm --manage /dev/md1 --remove /dev/sdb
sudo mdadm --manage /dev/md2 --fail /dev/sdb
sudo mdadm --manage /dev/md2 --remove /dev/sdb
sdb is not a member of any of these arrays so all of these commands will
fail.
The partitions are members of the arrays.
or
sudo mdadm /dev/md0 --fail /dev/sdb1 --remove /dev/sdb1
sudo mdadm /dev/md1 --fail /dev/sdb2 --remove /dev/sdb2
sd1 and sdb2 have already been marked as failed so there is little point
in
marking them as failed again. Removing them makes sense though.
sudo mdadm /dev/md2 --fail /dev/sdb3 --remove /dev/sdb3
sdb3 hasn't been marked as failed yet - maybe it will soon if sdb is a bit
marginal.
So if you want to remove sdb from the machine this the correct thing to
do.
Mark sdb3 as failed, then remove it from the array.
I'm not sure if I fail the drive partition or whole drive for each.
You only fail things that aren't failed already, and you fail the thing
that
mdstat or mdadm -D tells you is a member of the array.
NeilBrown
-------------------------------------
The mails I got are:
-------------------------------------
A Fail event had been detected on md device /dev/md0.
It could be related to component device /dev/sdb1.
Faithfully yours, etc.
P.S. The /proc/mdstat file currently contains the following:
Personalities : [raid1] [raid6] [raid5] [raid4] [multipath]
md1 : active raid1 sdb2[2](F) sda2[0]
4891712 blocks [2/1] [U_]
md2 : active raid1 sdb3[1] sda3[0]
459073344 blocks [2/2] [UU]
md3 : active raid1 sdd1[1] sdc1[0]
488383936 blocks [2/2] [UU]
md0 : active raid1 sdb1[2](F) sda1[0]
24418688 blocks [2/1] [U_]
unused devices:<none>
-------------------------------------
A Fail event had been detected on md device /dev/md1.
It could be related to component device /dev/sdb2.
Faithfully yours, etc.
P.S. The /proc/mdstat file currently contains the following:
Personalities : [raid1] [raid6] [raid5] [raid4] [multipath]
md1 : active raid1 sdb2[2](F) sda2[0]
4891712 blocks [2/1] [U_]
md2 : active raid1 sdb3[1] sda3[0]
459073344 blocks [2/2] [UU]
md3 : active raid1 sdd1[1] sdc1[0]
488383936 blocks [2/2] [UU]
md0 : active raid1 sdb1[2](F) sda1[0]
24418688 blocks [2/1] [U_]
unused devices:<none>
-------------------------------------
A Fail event had been detected on md device /dev/md2.
It could be related to component device /dev/sdb3.
Faithfully yours, etc.
P.S. The /proc/mdstat file currently contains the following:
Personalities : [raid1] [raid6] [raid5] [raid4] [multipath]
md1 : active raid1 sdb2[2](F) sda2[0]
4891712 blocks [2/1] [U_]
md2 : active raid1 sdb3[2](F) sda3[0]
459073344 blocks [2/1] [U_]
md3 : active raid1 sdd1[1] sdc1[0]
488383936 blocks [2/2] [UU]
md0 : active raid1 sdb1[2](F) sda1[0]
24418688 blocks [2/1] [U_]
unused devices:<none>
-------------------------------------
Got another problem. Removed the drive and tried to start it back up and now
get Grub Error 2. I'm not sure if when I did the mirrors if something when
wrong with installing grub on the second drive< or if is has to do with [U_]
which points to sda in that report instead of [_U].
I know I pulled the correct drive. I had it labled sdb, it's the second
drive in the bios bootup drive check and it's the second connector on the
board. And when I put just it in instead of the other, I got the noise
again. I think last time a drive failed it was one of these two drives
because I remember recopying grub.
I do have another computer setup the same way, that I could put this
remaining drive on to get grub fixed, but it's a bit of a pain to get the
other computer hooked back up and I will have to dig through my notes about
getting grub setup without messing up the array and stuff. I do know that
both computers have been updated to grub 2
How did you install Grub on the second drive? I have seen some
instructions on the web that would not allow the system to boot if the
first drive failed or was removed.
I think this is how I did it, at least it is what I had in my notes:
grub-install /dev/sda && grub-install /dev/sdb
And this is from my notes also. It was from an IRC chat. Don't know if
it was the raid channel or the grub channel:
[14:02] <Jordan_U> Vorg: No. First, what is the output of grub-install
--version?
[14:02] <Vorg> (GNU GRUB 1.98~20100115-1)
[14:04] <Jordan_U> Vorg: Ok, then run "grub-install /dev/sda &&
grub-install /dev/sdb" (where sda and sdb are the members of the array)
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