TP-00347-01 19
Preparation
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 buses and assign SCSI IDs, as was
required for parallel SCSI devices.
The companion Ark Tape server purchased from Editshare will be configured with a compatible
SAS Host Bus Adapter (H
BA). Refer to the Ark Setup and User Guide for more information.
Supported speeds by drive generation are shown in the following table:
LTO G enerat io n Supported Speeds
LTO-5 1.5 Gb/s, 3Gb/s, 6Gb/s
LTO-6 1.5 Gb/s, 3Gb/s, 6Gb/s
LTO-7 1.5 Gb/s, 3Gb/s, 6Gb/s
LTO-8 1.5 Gb/s, 3Gb/s, 6Gb/s
A SAS tape drive is identified by a un
ique
identifier called a World Wide Name (WWN) or World
Wide Identifier (WWID). The library assigns the WWID to the drive bay. When a tape drive is
replaced, the WWID is re-assigned to the new tape drive.
The operating system tracks the WWID for the tape drive on each HBA channel. Each of the drive
conn
ectors on the fan-out cable is associated with an HBA channel. Once a tape drive has been
plugged in, it should remain on the same channel to retain the association between the HBA
channel and WWID.
Fibre Channel Requirements
For best performance, use the appropriate HBA for your tape drive. A lower throughput
HBA might result in performance degradation
when backing up highly compressible data
to a higher throughput tape drive.
In a SAN installation, all switches between the host and the library
must be of the
appropriate type. A lower throughput switch in the path may result in performance
degradation. Configure zoning so only the backup servers may access the library.
The Fibre Channel tape drive can be connected directly to the server with a host bus adapter (HBA).
The installation requires one Fibre Channel cable for ea
ch tape drive. The tape drives all utilize an
LC-style connector. Some drives will have two FC ports, but only one cable connection is needed
per drive. The cable can be connected to either drive FC port.
The companion Ark Tape server purc
hased from Editshare will be configured with a compatible FC
Host Bus Adapter (HBA). Refer to the Ark Setup and User Guide for more information.
Supported speeds by drive generation are listed in the following table:
LTO G enerat io n Supported Speeds
LTO-5 2 Gb/s, 4 Gb/s, 8 Gb/s
LTO-6 2 Gb/s, 4 Gb/s, 8 Gb/s
LTO-7 2 Gb/s, 4 Gb/s, 8 Gb/s
LTO-8 2 Gb/s, 4 Gb/s, 8 Gb/s
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