HP StorageWorks MSL Library Extender user guide (AQ746-96005, September 2009)

Slot numbering and mailslot configurations
Magazine and mailslot numbering begins with the lower Library and continues with the master Library.
For storage slot numbering, see Table 2.
Table 2 Storage slot numbering
Slot numbers (without mailslots enabled)Extended library configuration
Master LibraryLower LibraryMaster LibraryLower Library
25–721–24MSL4048MSL2024
49–961–48MSL4048MSL4048
25–1201–24MSL8096MSL2024
49–1441–48MSL8096MSL4048
The mailslots in both Libraries can be configured for use in the extended library. For mailslot numbering,
see Table 3.
Table 3 Mailslot numbering
Mailslot numbers (with all mailslots enabled)Extended library configuration
Master LibraryLower LibraryMaster LibraryLower Library
M2–M4M1MSL4048MSL2024
M4–M6M1–M3MSL4048MSL4048
M2–M16M1MSL8096MSL2024
M4–M19M1–M3MSL8096MSL4048
Tape drives
Tape drives are numbered starting with the lower Library and continuing with the master Library.
Any tape drive in the extended library can host the SCSI Library interface. The default is the lowest
tape drive in the lower Library.
Power supply redundancy
Both Libraries must have a working power supply for the extended library to operate. To have total
power supply redundancy, both Libraries must have working redundant power supplies. In an extended
library, if only one Library has redundant power supplies installed, the extended library will continue
to operate in case of a power supply failure in that Library. An extended library containing an
MSL2024 cannot have total power supply redundancy because the MSL2024 only has one power
supply.
Features and overview12