RE: my first raid disaster on reboot :o( update2
From: Ken Walker (ken.walker_at_manchester.ac.uk)
Date: 09/08/05
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To: 'debian-user ' <debian-user@lists.debian.org> Date: Thu, 8 Sep 2005 19:53:08 +0100
I unmounted my md7 and md8.
Left hda and hdc as a single partition
set hdb and hdd to 160gig ( cos hdd was 4 gig bigger !! )
set all partitions to FD
formatted all to ext3
rechecked the partitions were still fd with cfdisk, all ok
created raid1 for
md7 = hda/hdc
md8 = hdb1/hdd1
they went of to build.
did a check whith cfdisk and found that hda and hdc had no defined type, but
hdb1 and hdd1 were still down as fd. Left them as they were for now.
rebooted
they both came up and mounted but with the following errors
Sep 8 19:05:09 Samba4 kernel: EXT3-fs warning: mounting fs with errors,
running e2fsck is recommended
Sep 8 19:05:09 Samba4 kernel: EXT3 FS on md7, internal journal
Sep 8 19:05:09 Samba4 kernel: EXT3-fs: mounted filesystem with ordered data
mode.
Sep 8 19:05:09 Samba4 kernel: kjournald starting. Commit interval 5
seconds
Sep 8 19:05:09 Samba4 kernel: EXT3-fs warning: mounting fs with errors,
running e2fsck is recommended
Sep 8 19:05:09 Samba4 kernel: EXT3 FS on md8, internal journal
Sep 8 19:05:09 Samba4 kernel: EXT3-fs: mounted filesystem with ordered data
mode.
ps all the other md's on the scsi's came up clean
so i did
Samba4:/home/mctsskew# e2fsck /dev/md7
e2fsck 1.37 (21-Mar-2005)
The filesystem size (according to the superblock) is 30156840 blocks
The physical size of the device is 30156816 blocks
Either the superblock or the partition table is likely to be corrupt!
Abort<y>? no
/dev/md7 contains a file system with errors, check forced.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/md7: 11/15089664 files (0.0% non-contiguous), 481736/30156840 blocks
and
Samba4:/home/mctsskew# e2fsck /dev/md8
e2fsck 1.37 (21-Mar-2005)
The filesystem size (according to the superblock) is 39062039 blocks
The physical size of the device is 39062016 blocks
Either the superblock or the partition table is likely to be corrupt!
Abort<y>? no
/dev/md8 contains a file system with errors, check forced.
Pass 1: Checking inodes, blocks, and sizes
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
/dev/md8: 11/19546112 files (0.0% non-contiguous), 621574/39062039 blocks
Is the difference in superblock because mdadm had made the usable space
availiable the same on both drives because there may be slight differencts
between the mirrored disks.
when a raid is created with mdadm, does it automatically overwrite the last
superblock with the new or does the old superblock have to be cleared
manually before a new one is created, if so how is that done.
With md7 and md8 now being seen and enabled and mounted at boot, is there a
real problem or is it a ghost problem, ie it says there is but there isn't.
when using fschk, is it done on /dev/md or is it done on each disk/partition
making up the raid
if you create a raid1 with mdadm do you create the filesystem before or
after the raid is assembled.
Many thanks
Ken
-----Original Message-----
From: Alvin Oga
To: Ken Walker
Cc: debian-user
Sent: 08/09/2005 14:39
Subject: Re: my first raid disaster on reboot :o( update
hi ya ken
On Thu, 8 Sep 2005, Ken Walker wrote:
== which is it ..
- raid1 or raid0 .. big difference betweenthe two
> /dev/md7 using /dev/hda,/dev/hdc
> /dev/md8 using /dev/hab,/dev/hdd
the whole disk or /dev/hda1 and /dev/hdc1 ??
- its a good choice for /dev/hdcxx and /dev/hdcxx
but it'd be better for hda+hdd and hdb+hdc
> mdadm -C /dev/md7 -l1 -n2 /dev/hda /dev/hdc
why ??
> I checked with Fdisk that they were all set as FD.
good
> And on reboot only md0 would mount.
and what is /dev/md0 ???
- its not defined above
> So i copied the original mdadm.conf back and rebooted, and all the
raids
> apart from md7 and md8 started.
presumably you have /dev/md0, /dev/md1, .. etc.. etc
copying mdadm.conf files is not a good idea unless
its all configured the same way ...
> The system booted up properly this time but again without md7 or md8,
it did
> its corrupt superblock or ext2 file system complaints.
:-)
moving files around and/o incorrect mdadm commands
> DEVICE /dev/sdb1 /dev/sdc1
> ARRAY /dev/md0 level=raid0 num-devices=2
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
raid0 means 2-small-disk is combined to look like 1 big-disk
\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\
- ie, there is no redundancy
> ARRAY /dev/md0 level=raid0 num-devices=2
> UUID=410a299e:4cdd535e:169d3df4:48b7144a
> DEVICE /dev/sdb1 /dev/sdc1
>
> Which way round should it be?
if you're referring to the order of array, uuid and device, it shouldn't
matter unless things changed that it is order sensitive
> I have also read that a mdadm.conf file isn't really needed, but can
be
> helpful, if i hide me mdadm.conf file will the system boot with md7
and md8.
i'd say you have some undefined ( unknown ) /dev/md devices
> I do have those two raids in my fstab file at the end as
>
> /dev/md7 /Cad100 ext3 defaults 0 2
> /dev/md8 /Cad200 ext3 defaults 0 2
and where is / /tmp and /var etc defined
the system should boot with /dev/md7 and /dev/md8 commented out,
otherwise you ahve system problems ... in additiona to corrupted raid
devices
> The SCSI is split up into / /usr /var /swap /tmp and /home, each
set as
> a raid1.
goood
but here you said raid1 ... the previous config files you showed
referred
to raid0
> The IDE's are set up as raid1 on the ide channels, such that hda is
mirrored
> with hdc and hdb is mirrored with hdd.
its a good start .. but it will nto guarantee that you cn boot,
because you do NOT have a master disk on the 2nd raid pair
( some bios' is picky )
> I had to move the system today so powered down with shutdown -h now.
good
> On reboot i just get / mounted ( i think ) and everything else says
mdx
> corrupt superblock or such and not a valid ext2 fs.
corrupt superblock means your eitehr your fs is corrupt or your raid
is broken ( not really working raid )
> all the mirrors were set us as ext3 and when it was up and running
> /proc/mdstat said all was well.
what is its output ??
c ya
alvin
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