Seagate ST11200N Technical Information PDF herunterladen (Seite 99)

Using the Passthru Driver

◆ Establishes a default tape driver operating mode. If the operator changes the

default mode, NetBackup may be unable to correctly read and write tape media,

resulting in data loss.

In particular, never set MT_ST_ASYNC_WRITES, or MT_ST_SYSV to the value

one. Never set MTSETBLK to a non-zero value. Do not interfere with the execution

of make_scsi_dev at system boot (it is called by the S77netbackup startup

script).

See “Configuring SCSI Robotic Control Device Paths (2.4 kernel)” on page 87 and

“Adding Standard Tape Drives (2.4 kernel)” on page 88.

◆ For Linux distributions using the 2.6 kernel, avrd establishes a default tape driver

operating mode. If the operator changes the default mode, NetBackup may be unable

to correctly read and write tape media, resulting in data loss

◆ Verify that a SCSI low-level driver is installed for each HBA in your system. Refer to

your HBA vendor documentation.

◆ Follow the HBA Vendor's installation guide to install or load the driver in the

kernel.

◆ Configure the kernel for SCSI tape support, SCSI generic support.

◆ Probe all LUNs on each SCSI device and enable the SCSI low-level driver for the

HBA.

◆ Enable multi-LUN support for the kernel according to operating system

documentation.

◆ Linux kernels previous to 2.4.15 do not support sixteen byte SCSI commands. WORM

media is not supported with these HBA’s for either LTO-3 or SDLT drives. To

override this rule, run:

touch /usr/openv/volmgr/database/SIXTEEN_BYTE_CDB

◆ Multipath configurations (multiple paths to robots/drives) are supported only with

the 2.6 kernel or later, native path (/dev/nstN, /dev/sgN), and the sysfs file system

mounted on /sys.

Using the Passthru Driver

The SCSI passthru driver and SCSI passthru device paths are required by NetBackup for

full feature support. Performance will be degraded if SCSI passthru is not provided. The

passthru driver is used

◆ By avrd and robotic processes to scan drives.

◆ By NetBackup and Storage Migrator for locate-block positioning.

Chapter 6, Enterprise Linux 85

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Seagate ST11200N Technical Information Seite 99