User guide

Therefore, even though a standby drive is physically connected, the system denies
access to it so no data can be accidentally lost.
Other than the standby rebuild of disk drives, which is described in the
manufacturer’s user’s guide, these controllers do not support “hot-plugging”
(adding or removing devices while the system is running).
To add or remove devices, shut down the system, add or remove the devices,
reconfigure the HBA using the vendor’s configuration utility, and
reconfigure-reboot (b-r) your system.
The driver does not support variable-length tape drives or multivolume backup or
restore for tape drives connected to the controller.
Due to a Mylex firmware limitation, on older cards, SCSI tape and CD-ROM
devices will not function reliably when attached on a channel that also contains
SCSI hard disk drives. However, on newer PCI SCSI cards such as the DAC960PG
and DAC960PJ, this limitation has not been observed. The latest firmware for any
Mylex card can be obtained from their Web site.
A tape block size greater than 32 Kbytes cannot be used. To be certain of correct
SCSI device operation on all cards, use SCSI tape and CR-ROM devices only on an
otherwise unused channel and with a fixed block size of 32 Kbytes or less.
Long tape commands (erasing a large tape) may fail because the Mylex controllers
have a one-hour timeout maximum for the command.
Enable tag queuing only for SCSI disk drives that are officially tested and
approved by Mylex Corporation for the DAC960 controller family. Otherwise,
disable tag queuing to avoid problems.
The command mt erase works but may report the following error message when
it gets to the end of the tape:
/dev/rmt/0 erase failed: I/O error
This message can be ignored.
Device Reference Pages 61