Seagate ST11200N Technical Information PDF herunterladen (Seite 21)

Preventing Possible System Problems

When system memory is limited, Solaris unloads unused drivers from memory and

reloads drivers as needed. Tape drivers are a frequent candidate for unloading, since they

tend to be less heavily used than disk drivers. Depending on the timing of these unload

and load events for the st (Sun), sg (VERITAS), and fibre channel drivers, various

problems may result. These problems can range from devices “disappearing” from a SCSI

bus to system panics.

VERITAS recommends adding the following forceload statements to the

/etc/system file. These statements prevent the st and sg drivers from being unloaded

from memory.

forceload: drv/st

forceload: drv/sg

Other statements may be necessary for various fibre channel drivers, such as the

following example for JNI drivers. This statement prevents the named driver from being

unloaded from memory.

forceload: drv/fcaw

Understanding the SCSI Passthru Drivers

NetBackup Media Manager provides its own driver for communicating with

SCSI-controlled robotic peripherals. This driver is called the SCSA (Generic SCSI passthru

driver), also referred to as the sg driver.

Note Since NetBackup uses its own passthru driver, the Solaris sgen scsi passthru driver

is not supported.

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.

◆ By NetBackup and Storage Migrator for SAN error recovery.

◆ By NetBackup and Storage Migrator for Quantum SDLT performance optimization.

◆ By NetBackup and Storage Migrator for SCSI reserve/release.

◆ To set the optical drive type (as explained in “Setting the HP Optical Drive Type in

Nonvolatile Memory” on page 25).

◆ By the NetBackup device configuration GUIs to collect robot and drive information.

Chapter 2, Sun Solaris 7

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Seagate ST11200N Technical Information Seite 21