Seagate ST11200N Información técnica descargar pdf (Pagina 104)

Other Considerations (Advanced Topics)

Since NetBackup uses only one minor number, you can modify the driver and support up

to 128 tape devices. The st.h source file, found in the Linux source directory

/drivers/scsi, must be modified to change the number of devices that will be

supported as shown in the following table:

Number of Tape

Devices Supported

Original Value New Value

#define ST_NBR_MODE_BITS 2 #define ST_NBR_MODE_BITS 1

128

#define ST_NBR_MODE_BITS 2 #define ST_NBR_MODE_BITS 0

Improving Performance

The st tape driver has internal buffers that have a default size of 32K. Performance may be

enhanced if they are set to match the default block size used by bptm. The default block

size for bptm is 64K. Edit the st_options.h file as shown in the following table:

Original Value New Value

#define ST_BUFFER_BLOCKS 32 #define ST_BUFFER_BLOCKS 64

You also may need to change the following entry to have a smaller value depending on

the available system memory:

#define ST_MAX_BUFFERS 4

Follow the operating system guidelines for incorporating these source changes into your

system.

Using the Debug Mode

The st tape driver can be put into a debug mode. This mode will echo each command and

its result to the syslog. See your operating system documentation for details.

Using an Emulex HBA

If NetBackup is unable to mount tapes when using an Emulex HBA in a fibre channel

configuration, it may be necessary to modify the lpfc.conf.c file.

90 NetBackup Media Manager Device Configuration Guide for UNIX, Windows, and Linux

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