Adaptec 1542B - AHA Storage Controller Fast SCSI 10 MBps Instalační příručka stáhnout pdf (Strana 64)

Known Problems and Limitations

If a SCSI disk drive is not deﬁned to be part of any physical pack within a system

drive, it is automatically labeled as a standby drive. If any SCSI disk drive within

a system drive fails, data on a standby drive may be lost due to the standby

replacement procedure. This replacement procedure will overwrite the standby

drive if the failed disk drive is conﬁgured with any level of redundancy (RAID

levels 1, 5, and 6) and its size is identical to the size of the available standby drive.

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 website.

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 and by IBM for

the DMC960. 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 Manual for Solaris 2.6 (Intel Platform Edition) ♦ April 1998

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Adaptec 1542B - AHA Storage Controller Fast SCSI 10 MBps Instalační příručka Strana 64