Moving Boot Partition from Old SAN to New SAN Assistance

joemillano · 11-29-2012, 09:54 AM

Hi ,

I have inherited this and so I may be sketchy on some information so please excuse!

I have seen other threads where suggestion is to ask Datacenter or Venors. At the moment our Datacenter doesnt have the Linux experience and Im in process of contacting Vendor but would like to ask community first.

I can supply more info if applicable.

We have 2 SANS in our Datacenter

SAN1 - HPXP OPEN-V
SAN2 - 3PAR
Server - HP G5
OS - Linux - Oracle Enterprise Linux ( RHEL 5 )

Our Storage guys have ( with server down ) done a copy of "raw" data from SAN1 to SAN2 , they unpresented SAN1 chunk and presented SAN2 chunk.

I changed the "Boot" disk in EMulex Controller on boot. This had been set to SAN1.

I booted and at Linux LVM startup I get :

fsck.ext3 - No Such Filesystem when trying to open /dev/mapper/mpath0p1
( and then for other mounts also )

I can remove the entry from fstab and server boots using a HP-initrd-2.6.18-164.el5.img-1 image instead of correct /boot

I believe I need to change WWID on Server but I am not 100% sure.

Any advice apreciated.

smallpond · 11-30-2012, 09:59 AM

There are multiple layers in the storage stack, so typically you want to start at the bottom and work your way up to find the problem. It would help if you can boot from a DVD in rescue mode. Below commands are issued as root from the bash command line.

1) Are you seeing the remote fibre channel node WWN?

Code:

cat /sys/class/fc_remote_ports/*/port_name

2) Are you seeing the disk partition?

Code:

cat /proc/partitions

3) Your fstab entry is /dev/mapper/mpath0p1 so it looks like you have multipathing to the drive. Check /etc/multipath.conf and make sure there is an entry for your 3par array.

4) Once the above is working, see if the volume group shows up snd is available.

Code:

vgs

5) And same for logical volume

Code:

lvs