User's Manual

88 Managing media
The main purpose of a capacity disk in FSE is its availability as a secondary storage space. A capacity
disk should be dedicated to the FSE disk media and the FSE disk buffer. Generally, it is used as a large
archive storage, meaning that the frequency of user access to archived files is relatively low compared to
that of the HSM file system on the performance disk. The capacity disk is used during migrations and
recalls and should have enough space for holding the migrated generations of the HSM file system files.
The available space on the disk media in an FSE disk media pool should correlate to the available space
on the tape media in the FSE tape media pool assigned to the same FSE partition. The FSE tape media
pool is typically used for storing the first copies. Suppose that the tape media pool contains 20 LTO Ultrium
1 media (approximately 20 * 200 GB of available space); the corresponding disk media pool should
have 4 TB of available space.
NOTE: It is recommended that a separate disk partition is allocated for the FSE disk buffer to improve
robustness and to avoid potential data loss.
Local and remote file systems as disk media
FSE supports local file systems to be configured as disk media.
Linux specific
On Linux platform, it is possible to use remote file systems as disk media and to access them via the NFS or
CIFS protocol.
NOTE: If you are configuring a remote file system as a disk medium, you can mount only a complete file
system created for this purpose; mounting shared directories (subtree of a file system) is not supported.
Linux specific
On Linux platform, a file system that will be configured as a disk medium must be mounted to a
subdirectory of /var/opt/fse/dm, for example:
Mounting a file system includes adding appropriate file system entries to the /etc/fstab file. For
automating the mounting, see the man pages for the fstab and mount commands.
Remote file systems are mounted via the NFS protocol. Note that when using an NFS volume as a disk
medium, you must export a file system with the no_squash_root parameter to enable “root” to access
the file system.
You define this parameter in the /etc/exports file on the NFS server for this particular export. It is
recommended that you make such exports available only for the FSE server. The following is the example
of the appropriate entry in the /etc/exports file:
Windows specific
On Windows platform, a file system for a disk medium must be mounted to a subdirectory of
%InstallPath%\var\dm; for example:
The value of %InstallPath% depends on the choice made in the FSE installation process. It defaults to
C:\Program Files\Hewlett-Packard\FSE.
To configure a mount point for a file system that will be used as a disk medium, use the Disk Management
interface (click Start > Settings > Control Panel, double-click Administrative Tools and then Computer
Management, and select Disk Management).
/var/opt/fse/dm/dm000001
/var/opt/fse/dm/dm000002
/mnt/disk_medium linux_host.company.com(rw,no_squash_root)
C:\Program Files\Hewlett-Packard\FSE\var\dm\dm000001
C:\Program Files\Hewlett-Packard\FSE\var\dm\dm000002