E.5 Adding a Shared Disk/Scaling Out

Under DFS, adding partitions to scale-out the system can provide either or both improvement in processing performance, and increased file system size of a shared disk device.

When adding partitions, unmount the targeted DFS.

The procedure for adding partitions to the DFS is described below using the following environment as an example:

Logical file system name:	pdfs1
Mount point:	/mnt/pdfs
Representative partition:	/dev/disk/by-id/scsi-1FUJITSU_300000370106
File system ID:	1
Master server:	master1,master2
Slave server, development server, collaboration server:	slave1, slave2, slave3, slave4, slave5, develop, collaborate
Existing partition:	/dev/disk/by-id/scsi-1FUJITSU_300000370107
Additional partition:	/dev/disk/by-id/scsi-1FUJITSU_300000370108

If the targeted DFS is mounted, unmount it.
Unmount the DFS at all slave servers, development servers and collaboration servers.
```
# umount pdfs1 <Enter>
```
Unmount the DFS at the master server.
```
# pdfsumntgl /dev/disk/by-id/scsi-1FUJITSU_300000370106 <Enter>
```

Check the file system information.

From the file system information recorded in the management partition, check the configuration of the targeted file system.

# pdfsinfo /dev/disk/by-id/scsi-1FUJITSU_300000370106 <Enter>
/dev/disk/by-id/scsi-1FUJITSU_300000370106:
FSID special                                             size Type mount
   1 /dev/disk/by-id/scsi-1FUJITSU_300000370106 (864)   25418 META -----
   1 /dev/disk/by-id/scsi-1FUJITSU_300000370106 (864)    5120  LOG -----
   1 /dev/disk/by-id/scsi-1FUJITSU_300000370106 (864)  232256 DATA -----
   1 /dev/disk/by-id/scsi-1FUJITSU_300000370107 (880) 7341778 DATA -----

Add the partition.

Add /dev/disk/by-id/scsi-1FUJITSU_300000370108 as a file data area.

# pdfsadd -D /dev/disk/by-id/scsi-1FUJITSU_300000370108 /dev/disk/by-id/scsi-1FUJITSU_300000370106 <Enter>

Check that the partition was added.

From the file system information, check that the partition was added.

# pdfsinfo /dev/disk/by-id/scsi-1FUJITSU_300000370106 <Enter>
/dev/disk/by-id/scsi-1FUJITSU_300000370106:
FSID special                                             size Type mount
   1 /dev/disk/by-id/scsi-1FUJITSU_300000370106 (864)   25418 META -----
   1 /dev/disk/by-id/scsi-1FUJITSU_300000370106 (864)    5120  LOG -----
   1 /dev/disk/by-id/scsi-1FUJITSU_300000370106 (864)  232256 DATA -----
   1 /dev/disk/by-id/scsi-1FUJITSU_300000370107 (880) 7341778 DATA -----
   1 /dev/disk/by-id/scsi-1FUJITSU_300000370108 (896) 6578704 DATA -----

Regenerate the DFS configuration information file.
Execute the pdfsmkconf command at the master server.
```
# pdfsmkconf <Enter>
```
Information
A configuration information file is generated, as pdfsmkconf_out/client.conf.fsid under the directory where the pdfsmkconf command is executed, for each file system ID, fsid.
Convert the configuration information file name to a logical file system name.
Convert the file system ID fsid to a logical file system name.
```
# cd pdfsmkconf_out <Enter>
# mv ./client.conf.1 client.conf.pdfs1 <Enter>
```
Distribute the configuration information file to each of the slave servers, development servers and collaboration servers.
```
# scp -p ./client.conf.pdfs1 root@slave1:/etc/pdfs/client.conf.pdfs1 <Enter>
# scp -p ./client.conf.pdfs1 root@slave2:/etc/pdfs/client.conf.pdfs1 <Enter>
```
Note
Place the configuration information file under /etc/pdfs at each of the slave servers, development servers and collaboration servers.
Mount the DFS and restart operation.
Mount the DFS, starting from the master server.
```
# pdfsmntgl /dev/disk/by-id/scsi-1FUJITSU_300000370106 <Enter>
```
Mount the DFS at all slave servers, development servers and collaboration servers.
```
# mount pdfs1 <Enter>
```