[CentOS] RAID + LVM Addition to CentOS 5 Install

Ross S. W. Walker rwalker at medallion.com
Tue Sep 4 14:12:04 UTC 2007

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?


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