User's Manual

HP StorageWorks File System Extender Software user guide 279

The following tables list the values that the variable can take:

Example

Operation fine-tuning options

HSM_USE_MAM

This debugging variable cannot be used with the fsesystem --enable-dbg command. It can only be

specified in the trace.cfg file.

The HSM_USE_MAM option is designed to ease debugging related to Medium Auxiliary Memory (MAM)

chips, which are integrated in the LTO Ultrium tape cartridges. You can prevent FSE from using the MAM

functionality by specifying the option as follows:

HSM_MEDIA_LOGGING

This debugging variable cannot be used with the fsesystem --enable-dbg command. It can only be

specified in the trace.cfg file.

Specifying this variable, you can prevent FSE from logging the actions performed on the FSE media, which

are normally logged into the FSE event log. Use the following line to disable media logging:

NOTE: Excessive logging may result in an FSE system performance becoming noticeably degraded. It

may be a good idea to disable media logging when you expect that many media operations will be

logged in a short period of time.

HSM_CALL_TIMEOUT

This debugging variable cannot be used with the fsesystem --enable-dbg command. It can only be

specified in the trace.cfg file.

In the FSE interprocess communication, the default timeout period for all omniORB (CORBA) calls is 2

days. For various reasons, you may want to change the default period to a different value. The timeout

value must be specified in milliseconds. Value 0 means no timeout.

Example

HSM_PT_DIRECT

This debugging variable cannot be used with the fsesystem --enable-dbg command. It can only be

specified in the trace.cfg file.

By default, the FSE implementation uses direct SCSI pass-through mode for controlling SCSI devices. Some

SCSI and Fibre Channel host bus adapters (HBAs) are not compatible with this mode, which may result in

problems using the attached devices. The variable HSM_PT_DIRECT in trace.cfg allows such HBAs to

be used in the FSE implementation. You can switch communication with devices from direct SCSI