[dm-devel] Configuring multipath for root device

[Pradipmaya Maharana]

Ok, so this is what the scene is :

linux-g78h:~ # ls -al /dev/disk/by-id/
total 0
drwxr-xr-x 2 root root 220 Jan  7 12:44 .
drwxr-xr-x 5 root root 100 Jan  7 12:44 ..
lrwxrwxrwx 1 root root   9 Jan  7 12:44 edd-int13_dev80 -> ../../sda
lrwxrwxrwx 1 root root  10 Jan  7 12:44 edd-int13_dev80-part1 -> ../../sda1
lrwxrwxrwx 1 root root  10 Jan  7 12:44 edd-int13_dev80-part2 -> ../../sda2
lrwxrwxrwx 1 root root  10 Jan  7 12:44 edd-int13_dev80-part3 -> ../../sda3
lrwxrwxrwx 1 root root   9 Jan  7 12:44 scsi-2221b000155f5d2d4 -> ../../sdb
lrwxrwxrwx 1 root root  10 Jan  7 12:44 scsi-2221b000155f5d2d4-part1
-> ../../sda1
lrwxrwxrwx 1 root root  10 Jan  7 12:44 scsi-2221b000155f5d2d4-part2
-> ../../sda2
lrwxrwxrwx 1 root root  10 Jan  7 12:44 scsi-2221b000155f5d2d4-part3
-> ../../sda3
lrwxrwxrwx 1 root root   9 Jan  7 12:44 usb-ASUS_CB-5216A_DEF10A4090DF
-> ../../sr0
linux-g78h:~ #
linux-g78h:~ # uname -a
Linux linux-g78h 2.6.16.46-0.12-smp #1 SMP Thu May 17 14:00:09 UTC
2007 i686 i686 i386 GNU/Linux
linux-g78h:~ #
linux-g78h:~ # cat /etc/grub.conf
setup --stage2=/boot/grub/stage2 (hd0,0) (hd0,0)
quit
linux-g78h:~ #
linux-g78h:~ # cat /boot/grub/menu.lst
# Modified by YaST2. Last modification on Mon Jan  7 19:40:30 UTC 2008
default 0
timeout 8
##YaST - generic_mbr
gfxmenu (hd0,0)/message
##YaST - activate

###Don't change this comment - YaST2 identifier: Original name: linux###
title SUSE Linux Enterprise Server 10 SP1
    root (hd0,0)
    kernel /vmlinuz-2.6.16.46-0.12-smp root=/dev/sda2 vga=0x31a
resume=/dev/sda3 showopts
    initrd /initrd-2.6.16.46-0.12-smp

###Don't change this comment - YaST2 identifier: Original name: failsafe###
title Failsafe -- SUSE Linux Enterprise Server 10 SP1
    root (hd0,0)
    kernel /vmlinuz-2.6.16.46-0.12-smp root=/dev/sda2 vga=normal
showopts ide=nodma apm=off acpi=off noresume nosmp noapic maxcpus=0
edd=off 3
    initrd /initrd-2.6.16.46-0.12-smp

###Don't change this comment - YaST2 identifier: Original name: linux###
title SUSE Linux Enterprise Server 10 SP1 ORG
    root (hd0,0)
    kernel /vmlinuz-2.6.16.46-0.12-smp root=/dev/sda2 vga=0x31a
resume=/dev/sda3 showopts
    initrd /initrd-2.6.16.46-0.org.12-smp


So, I modified the fstab and menu.lst to replace all /dev/sdaX with
/dev/scsi-2221b000155f5d2d4-partX. It won't boot.

Any comments?

Thanks and Regards,
Pradipmaya.

On Jan 7, 2008 1:57 PM,  <malahal at us.ibm.com> wrote:
> Pradipmaya Maharana [pradipmaya at gmail.com] wrote:
> > I did exactly what you said for SLES 10.1,
> > - Create custom partition
> > - Created partitions for /boot, / and swap of 100MB, 5GB and 1024MB
> > respectively on /dev/sda. So /dev/sda1 is for "/boot", /dev/sda2 for
> > "/" and /dev/sda3 for "swap"
> > - Under fstab option, selected Mount by device-id for each of the partition
> > - Reboot is fine
> > - But as I said earlier, mount, fstab, everything shows devcie names, not id
> >
> > Any way to mount it by device-id?
> > Is there a way that it can be chaned after installation? Or re-install
> > is the only way.
>
> I would just replace sd* names by their equivalent by-id names in fstab
> and grub.conf. Do 'ls -l /dev/disk/by-id/*' to get the by-id names
> corresponding to your named partitions'
>
> No need to re-install.
>
>
>
> -Malahal.
>
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