Store03 can be used as a backup for exporting the admin, grouphomes, scratch, software, userhomes and data directories.

Background info:

The internal LUNs 61-67, 75 of the storage are exported to store03 also. The server is configured to have the LUNs discovered and multipath is not use at all. In the /etc/lvm/lvm.conf is put a filter for LVM to take into consideration only the /dev/sd[b-m] devices for scanning. These correspond to the a path to the previously mentioned LUNs. If this is not done LVM will discover all physical volumes 4 times! This method does not use multipath on purpose as it proved to cause problems and is meant to easier to get it running.

How does it work:

WARNING: store01 was in production so it was not tested

• Really make sure that store01 is down
• Make sure the scsi devices are there: lsscsi
• Use pvscan, vgscan and lvscan to check the LVMs
• activate the volume groups:

   vgchange -ay 

• optionally use xfs_check and xfs_repair to check the filesystems
• uncomment the mount entries form fstab and mount everything:

   mount -a 

  . In case the same volumes are mounted from another node the file systems can be corrupted.
• start nfs, samba and nfslock:

     service nfs start
     service nfslock start
     service smbd start

• Assume the ip of store01 of:

   ifconfig eth0:0 10.128.40.11 netmask 255.252.0.0 

WARNING: In case the above for some reason does not work do not leave the volumes mounted !!!

NOTE: Please update the page if the above fail or if you had to perform additional actions.

-- RaduStoica - 09 Apr 2008