Planning The Sas Configuration; About Sas; Sas Cables And Connectors - HP StorageWorks MSL2024 User's And Service Manual
Tape libraries
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Also See for StorageWorks MSL2024:
- Quickspecs (26 pages) ,
- Getting started (13 pages) ,
- Product brief (4 pages)
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MSL8048 and MSL8096: The default SCSI address for all tape drives is 4.
NOTE:
Use the HP Library & Tape Tools to check your server's parallel SCSI configuration. The HP Library
& Tape Tools utility is available without cost at http://www.hp.com/support/TapeTools.
Planning the SAS configuration
The key steps in planning the SAS configuration are obtaining a suitable HBA and cable.
The Library uses two SCSI logical unit numbers (LUNs) and requires an HBA with multiple LUN support.
Most HP SAS RAID controllers support Tape Libraries; many non-HP SAS RAID controllers to not support
Tape Libraries. To verify the specifications of your HBA or find a list of compatible HBAs, review the
compatibility matrix on the Enterprise Backup Solutions web site at: http://www.hp.com/go/ebs.
CAUTION:
Do not connect the Library to a SAS RAID controller unless the EBS matrix shows that the controller
is qualified with the Library. The server might not be able to boot when the Library is connected to a
non-supported SAS RAID controller.
About SAS
Serial Attached SCSI (SAS) is a computer bus technology mainly used to transfer data to and from
storage devices, including disk drives and tape drives. SAS-1 (LTO-4) is designed to transfer data at
3 Gb/sec, which is comparable to the speed attained by Ultra320 SCSI. SAS-2 (LTO-5) is designed
to transfer data at 6 Gb/sec.
SAS cables and connectors
SAS uses serial connections, with a direct connection between the host server and each of the storage
devices. This eliminates the need to configure SCSI busses and assign SCSI IDs, as is required for
parallel SCSI devices.
Most SAS HBA ports have four SAS channels. A tape drive uses one channel, so each HBA port can
support up to four tape drives. You can use a cable with one connector on each end, but only one
channel will be used. The HP SAS fanout cable recommended for use with the Library can connect
up to four SAS tape drives to a single SAS HBA port. See
40
Installing the Tape Library
Figure 17
on page 41.
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