Host Connection Considerations - ADIC Scalar i2000 Installation Manual

Host Connection Considerations

There are limitations on the number of hosts that can access a single drive and I/O blade fibre port.
Limitations are summarized below:
• SCSI-attached drives support a maximum of two initiators on the same bus
• Fibre channel-attached drives support a minimum of one initiator
• Fibre channel I/O blade maximum host connections is 64 per fibre port
The Ultrium tape drive model T200F (fibre channel drive) is an arbitrated-loop-only device (also known as
an NL port). The drive supports Fibre Channel Arbitrated Loop (FC-AL) protocol, and uses Class 3 Service
frames. The drive also supports both public (switch-attached) and private loops.
In contrast to the SNC family of products where the device map LUN is the FC_LUN presented to hosts, the
Scalar i2000 uses a LUN ID which is configured by using the Library Management Console FC Host and
SCSI Host commands. Library partitions as well as drives are presented as devices to be mapped. SCSI
IDs or cabling may affect which SCSI device map LUN is associated with which FC Host or SCSI Host LUN
ID; therefore, caution is required to ensure that the device order is not altered when swapping drives, cables,
or locations. The partition should map to a higher priority LUN than the drives.
Scalar i2000 Installation Guide 63