Adaptec APA-358 User Manual download pdf (Page 76)

If the same tape is mounted more than once, TD-ROM will

reuse the index file originally loaded. The PURGE keyword

will force the disk index image to be reread from tape.

Note > The following parameters (MAX, NUMBUFS, and BUFSIZE) can

be used in conjunction with one another to increase TD-ROM performance.

This requires more memory consumption from a limited pool of system

memory. When changing the default values, do so gradually while

monitoring system performance and potential out-of-memory errors.

MAX= ####

Specifies the maximum transfer block to read from tape.

The default is 32768 bytes. The argument is rounded to the

nearest multiple of 32768. Higher values tend to improve

performance but result in increased memory use. Values

above 524288 are not recommended.

NUMBUFS=##

Specifies the number of local read buffers. By default,

TD-ROM only retains the last buffer of data in memory.

Setting NUMBUFS to higher values may increase TD-

ROM performance when mounting tapes created from

segmented or fragmented drives. Values above 8 are not

recommended.

Netware

BUFSIZE=#####

Specifies the size in bytes for each local read buffer. The

default value is 65536. Setting BUFSIZE to a larger value

can increase TD-ROM performance at the expense of

available memory. Values above 131,072 are not

recommended.

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Adaptec APA-358 User Manual Page 76