RE: my first raid disaster on reboot :o( update

From: Ken Walker (
Date: 09/08/05

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    To: debian-user <>
    Date: Thu, 8 Sep 2005 15:06:28 +0100 

    Many thanks for your reply.

    The reference to raid0 was the copied example given at the web page i

    / , /urs, /tmp, /home and such are on two 9gig scsi drives , all partitions
    including swap are raid1 and they boot and mount fine now. There under md1
    md2 md4 md5 and the system boots from md0.

    It's just getting md7 and md8 to mount at boot :o(

    I'm using the whole of each ide drive, no partitioning. So i used /dev/hda -

    output of mdstat is all U's :o)

    even when i mount md7 and md8 manually mdstat says its a happy bunny


    -----Original Message-----
    From: Alvin Oga []
    Sent: 08 September 2005 2:39 pm
    To: Ken Walker
    Cc: debian-user
    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.

    > 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
    > 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

    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

    > The SCSI is split up into / /usr /var /swap /tmp and /home, each set
    > a raid1.


    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
    > 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.

    > 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

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