User's Manual

hp StorageWorks File System Extender User Guide 229

Example

HSM_LA_SERIAL_UNLOAD

This variable makes unloads from drives to library slots serialized. By default the unloads (medium ejects)

are made in parallel.

Example

HSM_FRI_SAFETYBUF_TAPE

When migrating data, BEA checks for free space on tape to be able to copy the FRI file to the end of the

medium. Since the drives only estimate the free space, there should be a safety buffer. This ensures that FRI

fits into the available space.

NOTE: The value is set in megabytes (only numeric characters are allowed).

Example

HSM_BEA_VERIFY_HEADER

Media header checks drop the performance of LTO drives dramatically. This variable enables the looser

verification of IDs in the volume header for tape media that do not have medium cartridge memory at the

time of migration. The IDs are verified only when the medium is exchanged.

The default value is “yes” or “true“. If this variable is set to "no" or "false" then the IDs in the header are

verified only if any one of the following conditions is met:

• The medium was loaded by the job.

• Any of the drive IDs was changed (vendor ID, product ID, serial number).

• A medium change notification was reported by the SCSI subsystem.

In all other cases it will be assumed that the medium has already been verified by the previous operation.

CAUTION: Data might get written to the wrong medium if it is exchanged manually and if an operation

that sends medium change notification from SCSI subsystem to the FSE implementation has been

performed. It is therefore hazardous to set this variable to “no” or “false” and perform manual drive

operations later on.

Example

Debugging HSM file system filter

To see the messages or debug trace information that the HSM file system filter left among the kernel

messages, proceed as follows.

Linux specific

On an FSE client, to see the messages or debug trace information the HSM file system filter left among the