HP StoreEver MSL2024, MSL4048, MSL8048, and MSL8096 Tape Libraries User and Service Guide (AK378-96059, December 2012)

Table Of Contents
Table 38 Performance impact of various parallel SCSI and FC library connections (continued)
RecommendationsPerformance impactConnection type
For LTO-4 or LTO-5 tape drives, upgrade to
4 Gb Fibre Channel.
Fibre Channel: 2 Gb
LTO-4: MARGINAL. An LTO-4 tape drive
is unable to sustain maximum transfer
speeds with 2:1 compressible data.
Upgrade to 4 Gb or 8 Gb Fibre Channel.
LTO-5, LTO-6: POOR. Two gigabit fibre
is inadequate for an LTO-5 or LTO-6 tape
drive.
GOOD. When fully used, 4 Gb and 8 Gb
Fibre Channel have sufficient bandwidth for
all supported tape drives.
Fibre Channel: 4 Gb, 8 Gb
Table 39 SAS HBA speeds required for optimal performance
HBA speedLTO generation
3 Gb or 6 Gb SASLTO-4, LTO-5
6 Gb SASLTO-6
Media
Once the data gets to the tape drive, it must be written onto the tape. If there are no bottlenecks
and the library starts having performance problems:
Try a new cartridge. A marginal cartridge can cause performance problems when the tape
drive has to retry writing to bad spots on the tape.
Clean the tape drive. See “Tape cartridges” (page 57) for instructions.
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 112 (page 159).
Figure 112 Access holes for the right and left magazines
Right magazine release1.
Left magazine release2.
3. To manually release magazines, insert the end of a small metal pin or straightened paper clip
into the appropriate magazine access hole at the back of the device about 1.5 cm (0.6 inch),
while another person grasps the magazines on that side and pulls them out of the front of the
unit. For the MSL4048, MSL8048, and MSL8096, all magazines on a side are released and
should be removed at the same time. See Figure 113 (page 160).
Service and repair 159