Manually cleaning a Db2 managed clustered file system

This topic guides you through the required steps to manually clean a Db2 managed clustered file system.

About this task

Using the db2idrop -g command to remove the IBM® Db2 pureScale® Feature from your environment removes the IBM Storage Scale cluster on all hosts except for the host on which the db2idrop command was run. Use this procedure to remove the IBM Storage Scale file system and cluster on the remaining host. All data on the IBM Storage Scale file system will be lost. After the db2idrop command has completed, the IBM Storage Scale cluster will be left over on installation-initiating host (IIH) only. Manual clean up is only required on the host acting as the IIH.

Procedure

List existing IBM Storage Scale file systems using the following command:
```
DB2DIR/bin/db2cluster -cfs -list -filesystem
```
where DB2DIR represents the installation location of your Db2 copy.
The output of this command should be similar to the following:
```
FILE SYSTEM NAME	MOUNT_POINT
----------------	-----------
db2fs1			/db2sd_20091027220651
```
Set the IBM Storage Scale quorum type from tiebreaker to majority:
```
db2cluster -cfs -set -tiebreaker -majority
```
To ensure there is no data on the file system before deleting it, mount the file system:
```
db2cluster -cfs -mount -filesystem db2fs1
```
Delete all files under the IBM Storage Scale file system, including hidden files (except snapshots). Refer to step 1 to find the mount point of the IBM Storage Scale file system.
```
cd /db2sd_20091027220651
rm `ls -a`
```

Delete the IBM Storage Scale file system.

db2cluster -cfs -delete -filesystem db2fs1Copy

The output of this command should be similar to the following:

The file system 'db2fs1' has been successfully deleted.
All cluster configurations have been completed successfully.

List the IBM Storage Scale domain name:
```
db2cluster -cfs -list -domain
```
The output of this command should be similar to the following:
```
Domain Name: db2cluster_20091027220622.ca.ibm.com
```
Stop the IBM Storage Scale cluster:
```
/usr/lpp/mmfs/bin/mmshutdown -a
```

Delete the IBM Storage Scale cluster:

db2cluster -cfs -delete -domain db2cluster_20091027220622.ca.ibm.com

The output of this command should be similar to the following:

Deleting the domain db2cluster_20091027220622.in.ibm.com from 
the cluster was successful.

After removing IBM Storage Scale cluster and file systems, delete the GPFS_CLUSTER and DEFAULT_INSTPROF variable records in the Global Registry.
```
db2greg -delvarrec service=GPFS_CLUSTER,variable=NAME,installpath=-
db2greg -delvarrec service=DEFAULT_INSTPROF,variable=DEFAULT,installpath=-
```
If you dropped the instance manually, you must also remove these variables from all nodes in the IBM Storage Scale cluster.