Help with ES v3 Raid1 (Mirror)

[Cleber P. de Souza]

You could run mdadm --detail --scan > /etc/mdadm.conf to save the
array setting in the disk.
There are others options that you can put into this file as to be
alerted during raid failure.
See man mdadm.conf.

On 2/1/06, Marc Leveille <marc.leveille at nrc-cnrc.gc.ca> wrote:
> This worked, but I had an issue. I'll explain. I ran your process and
> after step 8 I was able to mount this device and write to it. after
> re-booting it failed during start-up with the same error. The only thing
> that I can see is that if you set the 1 2 option in the fstab it tells
> the system to run fsck at boot. when this runs it seems to distroy
> something, because when I remove the line in fstab and reboot, I can no
> longer mount it because of wrong fs type.
>
> I will re-run your process but use 0 0 in fstab before restarting.
>
> Marc
>
> On Wed, 2006-02-01 at 17:20 -0200, Cleber P. de Souza wrote:
> > Hi Marc.
> >
> > I think you forgot somethings.
> > After you fdisk a disk, you must restart the system so the new changes
> > have efect.
> > So I suggest you follow this steps:
> >
> > 1) fdisk sdb setting fd to the partition, as you did;
> > 2) restart the system;
> > 3) execute sfdisk -d /dev/sdb | sfdisk /dev/sdc (copy partition
> > structure from sdb to sdc);
> > 4) restart again;
> > 5) run the command to make the raid devices (mdadm ...), as you did;
> > 6) mkfs.ext3 /dev/md0
> > 7) e2fsck -f /dev/md0
> > 8) add lin in fstab.
> >
> > Ready.
> >
> >
> >
> > On 2/1/06, Marc Leveille <marc.leveille at nrc-cnrc.gc.ca> wrote:
> > > I have tried this all morning without success. I also tried making the
> > > raid device using sdb1 and sdc1 as oppesed to sdb and sdc. Here is what
> > > I am doing in exact steps because sometimes one little thing can mess
> > > things up.
> > >
> > > 1- Fdisk sdb and create a primary partition with full size of drive and
> > > set type to FD (Linux Raid). write and exit
> > > 2- same as step 1 but for sdc.
> > > 3- run the command to make raid device. "mdadm --create /dev/md0
> > > --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1
> > > 4- mkfs.ext3 /dev/md0 (completes with noe errors)
> > > 5- e2fsck -f /dev/md0 (works with no errors)
> > > 6- add line in fstab
> > > /dev/md0   /home/apps  ext3    defaults  1 2
> > >
> > > reboot and get
> > >    FSCK.ext3 /dev/mdo the superblock could not be read or does not
> > > describe a correct EXT2 Filesystem.......bla bla and asks to run E2FSCK
> > > -B 8193
> > >
> > > e2fsck: invalid arguement whilt trying to open /dev/md0
> > >
> > > thanks
> > >
> > > Marc
> > >
> > > On Wed, 2006-02-01 at 13:40 -0200, Cleber P. de Souza wrote:
> > > > OK.
> > > > Put your success of failure here later.
> > > > I had this problem one time making raid from a existing Red Hat system
> > > > and solve in this way.
> > > >
> > > > On 2/1/06, Marc Leveille <marc.leveille at nrc-cnrc.gc.ca> wrote:
> > > > > Hi, I never ran e2fsck -f /dev/md0 after making fs on /dev/md0.
> > > > >
> > > > > I will try this this morning.
> > > > >
> > > > > Marc
> > > > >
> > > > > On Wed, 2006-02-01 at 10:15 -0200, Cleber P. de Souza wrote:
> > > > > > Hi Marc.
> > > > > >
> > > > > > After run mdadm --create you must also run mkfs.ext3 /dev/md0 and
> > > > > > e2fsck -f /dev/md0.
> > > > > > So you will get OK.
> > > > > >
> > > > > >
> > > > > >
> > > > > > On 1/26/06, Marc Leveille <marc.leveille at nrc-cnrc.gc.ca> wrote:
> > > > > > > Hi, I'm trying to setup a Raid1 mirror between 2 hard drives. I have the
> > > > > > > following.
> > > > > > >
> > > > > > > 1- SDA 36gig System disk
> > > > > > > 2- SDB 36gig blank
> > > > > > > 3- SDC 36gig blank
> > > > > > >
> > > > > > > I'm trying to Mirror SDB to SDC by doing the following.
> > > > > > >
> > > > > > > 1- By using FDisk I created SDB1 and SDC1 on each drive.
> > > > > > > 2- I then makefs ext3 for each partition.
> > > > > > > 3- Then I used mkadm --create /dev/md0 --level=1
> > > > > > > --raid-devices=2 /dev/sdb1 /dev/sdc1
> > > > > > >
> > > > > > > I ran watch cat /proc/mdstat until the process was completed.
> > > > > > > 4- when it was complete I tested the mount using mount -t
> > > > > > > ext3 /dev/md0 /home/apps and it mounted and I was able to open it.
> > > > > > > 5- I then edited fstab with /dev/md0 /home/apps ext3 defaults 1 2 and
> > > > > > > rebooted.
> > > > > > > 6- I now get the following error at boot.
> > > > > > >
> > > > > > > FSCK.ext3 /dev/mdo the superblock could not be read or does not describe
> > > > > > > a correct EXT2 Filesystem.......bla bla and asks to run E2FSCK -B 8193
> > > > > > >
> > > > > > > 7- I used Vi and comented out the mount in fstab and re-booted. I tried
> > > > > > > to manually mount the drive the same way as (Item #4) and it now fails
> > > > > > > Mount: Wrong FS Type.
> > > > > > >
> > > > > > > Any ideas as to what I need to do. Sould I use ext3 ?
> > > > > > >
> > > > > > > thanks
> > > > > > >
> > > > > > > Marc
> > > > > > >
> > > > > > > --
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> > > > > >
> > > > > >
> > > > > > --
> > > > > > Cleber P. de Souza
> > > > > >
> > > > >
> > > > > --
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> > > > --
> > > > Cleber P. de Souza
> > > >
> > >
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> > Cleber P. de Souza
> >
>
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--
Cleber P. de Souza