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Drives in Tape Arrays 55
Drives in Tape Arrays
SCSI connection between the tape drive and the host server so that the drive is
the only device on the SCSI bus. It is possible to daisy-chain two tape drives
together within the tape array, but this should only be done if the drives are
on an Ultra4 (320) SCSI bus. Do not daisy-chain more than two drives
together, as this will degrade their individual performance with respect to
transfer rate.
Do
not
attach the drive to the same SCSI bus as your disk drive or RAID
controller.
Replacing a Drive
HP Ultrium removable drives can be removed and replaced without powering
down the tape array and without interrupting operations to the other drives in
the array. However you should be aware of the following:
3
In Berkeley mode, the tape position will remain unchanged by a device
close operation.
3
In AT&T mode, a device close operation will cause the tape to be
repositioned just after the next tape filemark (the start of the next file).
If all drives in the tape array are powered up when the system is turned on,
the host will be aware of those drives. You can remove any of those drives
and replace it with another drive without disrupting the system.
If a drive is not powered up or you place a drive in an empty slot after the
system has been powered up, the system will have to be reset before the host
will recognize the drive.
Removable drives allow modules to be replaced while powered up as long as
no data is being transmitted from the system to the module or vice versa. The
SCSI IDs are controlled by the tape array, not by the drives themselves, so if
you remove a drive and replace it with another the ID will not change.