ltfs - Linear Tape File System support
SUNWsamfs
Oracle HSM can manage Linear Tape File Systems (LTFS) media. These volumes are only used for accessing customer data; Oracle HSM does not currently use LTFS volumes for archives.
For a volume to be considered as LTFS media, its must have the following Oracle HSM attributes: 1) it is unlabeled, 2) it is non-SAM, 3) it is marked as LTFS, and 4) it must be formatted with an LTFS file system.Oracle HSM has the ability to access the contents of LTFS media through a QFS file system. The contents of the media can be accessed on demand or bulk-loaded.
The
samltfs
command has two subcommands enabling content access. The first,
attach,
copies the file system meta-data from the LTFS volume into a empty
directory on an Oracle HSM file system. The attached file meta-data in
the Oracle HSM file system is associated with the LTFS media and the
associated file. It is managed like any other Oracle HSM file. When
the file is accessed on the Oracle HSM file system, the file is staged
from the LTFS media. After the file's contents have been staged,
the association with the LTFS media remains. It is also treated
like any other file with regard to the archival and space management
policies for the Oracle HSM file system.
samltfs
command provides an
ingest
subcommand. It behaves similiarly to the
attach
subcommand, but after the media's contents are attached to the Oracle HSM
file system, the contents are immediately scheduled to be staged.
If the customer wishes to access the contents of a piece of LTFS media
without copying the contents into an Oracle HSM file system, the
samltfs
command provides a
load
subcommand. This subcommand loads the specified LTFS media on a drive
and mounts its file system. The customer can directly access the media's
contents through the mounted file system. The
unload
subcommand is used to unmount the media and unload the media from the
drive.
If the customer needs to manage the LTFS media, the
samltfs
command provides three additional subcommands. The
mkltfs
subcommand is used to partition the media and create its file system.
Conversely, the
unltfs
subcommand will erase the file system from the media and restore its
partitions. If the customer suspects that the LTFS media is corrupted,
the
ltfsck
subcommand will perform a basic file system check.
The Oracle HSM
import
(1m)
command has the capability of identifying LTFS media when the media is
imported. No special support is necessary to export LTFS media.
The System Log (syslog) is used to record mount and processing status.
It uses syslog's
user
facility.
The following or similar needs to be added to
∕etc∕syslog.conf
making sure the two fields are separated by a tab:
user.debug ∕var∕adm∕sam-ltfs.log
That log's aging needs to be addressed based on the customer's requirements.
LTFS support is not enabled by default. At a minimum a ltfs
mount point
must be specified in the defaults configuration. See defaults.conf
(4)
for more information.
Here is an example defaults.conf
entry for ltfs
which sets the number of concurrent tape accesses to 10 and the unload timeout
to 10 minutes (600 seconds):
# # This is part of file: ∕etc∕opt∕SUNWsamfs∕defaults.conf # ltfs = ∕mnt∕ltfs 10 600
defaults.conf
The configuration file for the StorageTek QFS and Oracle HSM software.
build_cat
(1m),
chmed
(1m),
dump_cat
(1m),
chmed
(1m),
import
(1m),
samltfs
(1m),
mcf
(4),
defaults.conf
(4).
Oracle HSM Documentation Library