[Linux-cluster] Backup GFS File system

[rhurst at bidmc.harvard.edu]

Are you cloning the disk(s)?  If so, are you backing up the volumes on
another server, outside of the cluster?  That is our implementation, and
we came up with a process that allows for that.  You need to install the
GFS/CS components on that server, but do not need to run it (ccs /
cman / fence, etc).  I marked the volumes with the lock_nolock protocol
for mounting, although there is a way to use mount arguments to override
what is on the volume (man gfs_mount).

Here's a snippet of a script we execute on the backup media server,
after the clone is completed:


CLONE_NAME="watson-clone"
VG="/dev/VGWATSON"

for RETRY in `seq 3 -1 0`; do
        DEVICE="`sudo ${POWERMT} display dev=all | grep -B 3 ${CLONE_NAME} | grep name=emcpower | awk -F= '{print $2}'`"
        [ -n "${DEVICE}" ] && break;
        sleep 5
done
if [ -z "${DEVICE}" ]; then
        echo "NO PowerPath device found for ${CLONE_NAME}"
        exit -1
fi
sudo ${PARTED} /dev/${DEVICE} set 1 lvm on
sudo ${VGRENAME} ${VG} ${VG}-CLONE 2> /dev/null
sudo ${VGCHANGE} -a y --ignorelockingfailure ${VG}-CLONE 2> /dev/null
sudo ${GFS_TOOL} sb ${VG}-CLONE/lvol0 proto lock_nolock <<-EOD
y
EOD
sudo ${GFS_TOOL} sb ${VG}-CLONE/lvol1 proto lock_nolock <<-EOD
y
EOD
sudo mount -t gfs ${VG}-CLONE/lvol0 /bcv/ccc/watson
sudo mount -t gfs ${VG}-CLONE/lvol1 /bcv/ccc/watson/wav
sudo mount -t ext3 ${VG}-CLONE/lvoldata /bcv/ccc/watson-data
sudo mount -t ext3 ${VG}-CLONE/lvoldb1 /bcv/ccc/watson-data/sys/db1



On Tue, 2007-05-22 at 14:56 +0100, Ben Yarwood wrote:

> I intend to create a backup of my GFS6.1 file systems (3 Node cluster) on a single backup machine and wanted to check some facts.
> 
> 
> 1.  To run a GFS filesystem with nolock as the lock protocol, do I need the rest of the cluster infrastructure?
> 
> 
> 2.  If I do need the rest of the cluster architecture, can you have a one node cluster?
> 
> 
> 3.  In the event of the primary storage failing and the backup being used, I can convert the lock protocol to dlm using gfs_tool
> e.g. gfs_tool sd /dev/sdx proto lock_dlm ?
> 
> 
> Thanks
> Ben
> 
> 
> 
> 
> 
> 
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Robert Hurst, Sr. Caché Administrator
Beth Israel Deaconess Medical Center
1135 Tremont Street, REN-7
Boston, Massachusetts   02120-2140
617-754-8754 ∙ Fax: 617-754-8730 ∙ Cell: 401-787-3154
Any technology distinguishable from magic is insufficiently advanced.
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