RE: how to resetup fake-raid
So it looks like I can not even access the md device the system created on boot.
Does anyone have a guide or tips to migrating from the older dmraid to mdadm for fake-raid?
fdisk -uc /dev/md127 (showing the block device is inaccessible)
Unable to read /dev/md127
dmesg (pieces of dmesg/booting)
[ 4.214092] device-mapper: uevent: version 1.0.3
[ 4.214495] device-mapper: ioctl: 4.15.0-ioctl (2009-04-01) initialised: dm-devel@redhat.com
[ 5.509386] udev[446]: starting version 163
[ 7.181418] md: md127 stopped.
[ 7.183088] md: bind<sdb>
[ 7.183179] md: bind<sda>
Thanks.
-M
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> To: debian-user@lists.debian.org
> Subject: how to resetup fake-raid
> Date: Thu, 11 Nov 2010 08:10:55 -0500
>
>
> Hello,
>
> I am trying to re-setup my fake-raid (RAID1) volume with LVM2 like setup previously. I had been using dmraid on a Lenny installation which gave me (from memory) a block device like /dev/mapper/isw_xxxxxxxxxxx_ and also a /dev/OneTB-RAID1, but have discovered that the mdadm has replaced the older and believed to be obsolete dmraid for multiple disk/raid support.
>
> Automatically the fake-raid LVM physical volume does not seem to be set up. I believe my data is safe as I can insert a knoppix live-cd in the system and mount the fake-raid volume (and browse the files). I am planning on perhaps purchasing another at least 1TB drive to backup the data before trying to much fancy stuff with mdadm in fear of loosing the data.
>
> A few commands that might shed more light on the situation:
>
>
> pvdisplay (showing the /dev/md/[device] not recognized yet by LVM2)
>
> --- Physical volume ---
> PV Name /dev/sdc7
> VG Name XENSTORE-VG
> PV Size 46.56 GiB / not usable 2.00 MiB
> Allocatable yes (but full)
> PE Size 4.00 MiB
> Total PE 11920
> Free PE 0
> Allocated PE 11920
> PV UUID wRa8xM-lcGZ-GwLX-F6bA-YiCj-c9e1-eMpPdL
>
>
> cat /proc/mdstat (showing what mdadm shows/discovers)
>
> Personalities :
> md127 : inactive sda[1](S) sdb[0](S)
> 4514 blocks super external:imsm
>
> unused devices:
>
>
> ls -l /dev/md/imsm0 (showing contents of /dev/md/* [currently only one file/link ])
>
> lrwxrwxrwx 1 root root 8 Nov 7 08:07 /dev/md/imsm0 -> ../md127
>
>
> ls -l /dev/md127 (showing the block device)
>
> brw-rw---- 1 root disk 9, 127 Nov 7 08:07 /dev/md127
>
>
> update-initramfs -u (Perhaps the most interesting error of them all)
>
> update-initramfs: Generating /boot/initrd.img-2.6.32-5-xen-amd64
> mdadm: cannot open /dev/md/OneTB-RAID1-PV: No such file or directory
>
>
> Thanks for any ones help :)
>
>
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