HP StorageWorks File System Extender Software V3.4 CLI reference (T3648-96013, October 2006)

2.11 NAME 89

Each FSE command communicates with the FSE processes through the Manage-

ment Interface (fse–mif). To execute an FSE command, the Management Interface

must be running. If the connection to the Management Interface fails, check its

status by running the fse ––status command. In case the Management Interface

is not running, start it with the fse – –start command.

After a successful command execution fsepool notiﬁes the FSE administrator with

a suitable message, which is printed to the standard output stream (stdout). If

there was an error during the command execution, an appropriate error message

is printed to the standard error stream (stderr).

MEDIA POOL TYPES There are three FSE media pool types that can be spec-

iﬁed when conﬁguring a new FSE media pool: regular, WORM and backup.

Regular FSE media pool is used for storing data, which is migrated from an HSM

ﬁle system. FSE media that belong to this type of media pool can be overwritten,

reorganized, re–initialized and re–formatted.

WORM FSE media pool differs from a regular FSE media pool in one impor-

tant characteristic: it is impossible to overwrite data on the media that belong

to this kind of media pool. Such media are called WORM media. Data that

had already been migrated to a WORM medium cannot be overwritten, it can

only be appended to. A WORM medium cannot be reorganized, re–initialized

or re–formatted. WORM FSE media pool type is therefore suitable for storing

permanent archives and for other similar purposes.

Backup FSE media pool is essentially different from the other two FSE media

pool types. FSE media in this type of media pool do not store user data migrated

from an HSM ﬁle system; they hold backup copies of the FSE server state created

by the fsebackup command. To be able to backup and restore the FSE server,

there must be a backup FSE media pool conﬁgured, to allow backup FSE media

allocation by the fsebackup and fserestore commands. A backup pool should be

conﬁgured with only one volume. Backup media in this pool must be initialized.

For details about FSE backup, see the fsebackup man page.

Note:

There can be only one backup FSE media pool conﬁgured in an FSE imple-

mentation.

HP StorageWorks File System Extender Software CLI reference