PRIMECLUSTER Global File Services Configuration and Administration Guide 4.1 (Linux)

Chapter 13 Migration to the GFS Shared File System

This chapter describes how to migrate from the ext2/ext3 file system to the GFS Shared File System.

Note the following items when migrating from the existing ext2/ext3 file system to the GFS Shared File System:

When files with holes on the ext2/ext3 file system are transferred to the GFS Shared File System, some area is reserved on the storage device and such files no longer have holes.

A file with a hole means a file containing a part to which no data block has been assigned.

File system migration first requires that files and directories on the ext2/ext3 file system be backed up on another location (for example, on a storage device or another file system). Then, a new GFS Shared File System should be configured, and the files and directories can be expanded. Take the following procedures:

Be sure the relevant ext2/ext3 file system is not in use.
Save all of the files on the ext2/ext3 file system on a backup device or another file system using a command such as tar(1) and cpio(1).
Create the GFS Shared File System, as described in "Creation", "Flow from file system creation to mount/unmount."
Expand the saved files on the created GFS Shared File System.

The following shows an example of migration on a same partition.

# cd /extmnt                                    <- /extmnt is the mount point of ext2/ext3 from which migration is performed.
# tar cvpf - . > /data/backup.tar            <-Back up files.
# cd /
# umount /extmnt
 
Perform GDS settings and management partition settings.
(For details about GDS settings, see "PRIMECLUSTER Global Disk Services Configuration and Administration Guide.")
 
# sfcmkfs -o node=mikan,mango /dev/sfdsk/gfs/dsk/volume1     <- Configure GFS.
# sfcmount /dev/sfdsk/gfs/dsk/volume1 /sfcfs                <- Mount on GFS.
# cd /sfcfs                                             <- Move to the GFS Shared File System mount point.
# tar xvf /data/backup.tar                              <- Expand backup files on the GFS Shared File System.

[Figure Migration from ext2/ext3]

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