Backup/archive software and method
Each backup method has its own impact on performance, depending on how well it can keep
data streaming to the tape drive. In most cases, native applications don’t have the features
required to maximize performance for LTO tape drives. Hewlett Packard Enterprise recommends
using a full-featured backup or archive application with this library.
File-by-file backup or archive methods provide the best restore performance if you only need to
restore individual files. However, if the average file size is small, file-by-file methods will
significantly reduce performance.
Disk image, flash, or sequential backup methods provide the fastest performance because they
back up an entire disk, partition, or LUN, which minimizes disk seeking. The disadvantage is that
backup and restore operations work on an entire disk, partition, or LUN. You might not be able
to back up a subset of files or restore a single file. If you can restore a single file, the restore
process will be slow.
Database backup performance will vary based on the use model. To improve performance when
backing up data from a database:
•
Use specific backup agents for the database.
•
Use the latest versions of the databases.
•
Do not back up individual mailboxes.
•
Do not back up specific records or do a record-by-record backup.
•
Do not back up when the database is in heavy use.
Connection from the archive/backup host server to the library
For the best performance, the connection from the host server to the library must have enough
bandwidth to provide enough data to keep the tape drive streaming. Current LTO tape drives
take advantage of some of the fastest interfaces available so the type of interface used to connect
the library to the host server is not likely to be the cause of a performance issue. However, issues
with cables and connectors can limit performance.
Verify that the system is using cables that are listed in the QuickSpecs, are in good condition,
and do not exceed recommended cable lengths.
Data cartridges
The type and condition of the data cartridges also affect backup performance. For best
performance, use Hewlett Packard Enterprise cartridges that are the same LTO generation as
the tape drives. If you suspect a performance issue related to data cartridges, use the L&TT
media assessment test to evaluate the condition of the data cartridges.
Service and repair
Releasing the magazines manually
If you cannot remove the magazines via the OCP or RMI, do the following:
1.
Unplug the power cord from the device.
2.
From the back of the device, find the access holes for the right and left magazines. See
Figure 80 (page 146)
.
Service and repair
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