< Previous  | TOC | Index | Next  >

Creating a snapshot on a Storage Foundation Cluster File System

The following example shows how to create and mount a snapshot on a two-node cluster using SFCFS administrative interface commands.

 To create a snapshot on a cluster file system

1. Create a VxFS file system on a shared VxVM volume:

# mkfs -t vxfs /dev/vx/rdsk/cfsdg/vol1

version 7 layout

104857600 sectors, 52428800 blocks of size 1024, log size 16384

blocks

unlimited inodes, largefiles not supported

52428800 data blocks, 52399152 free data blocks

1600 allocation units of 32768 blocks, 32768 data blocks

2. Mount the file system on all nodes (following previous examples, on system01 and system02):

# cfsmntadm add cfsdg vol1 /mnt1 all=cluster

# cfsmount /mnt1

The cfsmntadm command adds an entry to the cluster manager configuration, then the cfsmount command mounts the file system on all nodes.

3. Add the snapshot on a previously created volume (snapvol in this example) to the cluster manager configuration:

		# cfsmntadm add snapshot cfsdg snapvol /mnt1 /mnt1snap \ 

		system01=ro
 
 
 
Note
  The snapshot of a cluster file system is accessible only on the node where it is created; the snapshot file system itself cannot be cluster mounted. 

4. Mount the snapshot:

# cfsmount /mnt1snap

5. A snapped file system cannot be unmounted until all of its snapshots are unmounted. Unmount the snapshot before trying to unmount the snapped cluster file system:

# cfsumount /mnt1snap