[CentOS] RAID + LVM Addition to CentOS 5 Install

[Nick Webb]

On 9/4/07, Ross S. W. Walker <rwalker at medallion.com> wrote:
> From: centos-bounces at centos.org
> [mailto:centos-bounces at centos.org] On Behalf Of Nick Webb
> >
> > Hi All,
> >
> > I have what I believe to be a pretty basic LVM & RAID setup on my
> > CentOS 5 machine:
> >
> > Raid Partitions:
> > /dev/sda1,sdb1
> > /dev/sda2,sdb2
> > /dev/sda3,sdb3
> >
> > During the install I created a RAID 1 volume md0 out of sda1,sdb1 for
> > the boot partition and then added sda2,sdb2 to a separate RAID 1
> > volume as well (md1).  I then setup md1 as a LVM physical volume for
> > volume group 'system'.  I left the sda3,sdb3 partitions available for
> > future use.
> >
> > Next I created swap, /, /usr, /var, etc. logical volumes in the system
> > volume group and continued with this install as normal.  Everything
> > went fine.  I was able to use the system, reboot, etc., without
> > problems.
> >
> > I then discovered that I needed more space in my /var volume than was
> > available in the system volume group.  So, I created another RAID
> > device, /dev/md2 (using sda3,sdb3), and created an LVM physical volume
> > on top of that.  Finally, I extended the system physical volume to
> > contain this new physical volume and expanded the size of the /var
> > volume.
> >
> > This worked fine, but on reboot I get a ton of errors from LVM saying
> > that volume with id xxxx-xxxx-xxxx... was not found and the system
> > automatically reboots.  This seems to happen for all volumes, not just
> > the ones I changed.  This error even happens for a separate volume
> > group (called 'extended') that is on a separate set of disks and was
> > existing prior to the CentOS 5 install.
> >
> > Any idea on some step I missed?  I know things are still fine on the
> > disks, as when I boot with the CentOS DVD with the 'linux rescue'
> > option all RAID & LVM volumes are available for use.  So from this it
> > seems I need to update some CentOS config file?
> >
> > Here are some config files:
> > http://pastebin.com/m6d5075dc
>
> Did you PV /dev/sda3 and /dev/sdb3 instead of /dev/md2 either before or
> after the RAID set was created?
>
> -Ross

I don't think so, the partition types are 'fd' and if I boot from the
rescue CD, everything seems to be working fine.

sh-3.1# fdisk -l

Disk /dev/sda: 18.2 GB, 18210036736 bytes
255 heads, 63 sectors/track, 2213 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1          32      257008+  fd  Linux raid autodetect
/dev/sda2              33        1122     8755425   fd  Linux raid autodetect
/dev/sda3            1123        2213     8763457+  fd  Linux raid autodetect

Disk /dev/sdb: 18.2 GB, 18210036736 bytes
255 heads, 63 sectors/track, 2213 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1   *           1          32      257008+  fd  Linux raid autodetect
/dev/sdb2              33        1122     8755425   fd  Linux raid autodetect
/dev/sdb3            1123        2213     8763457+  fd  Linux raid autodetect

Nick