Help with ES v3 Raid1 (Mirror)

[Cleber P. de Souza]

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