ADIC Time Clock 6-00028-01 Rev A Manual de usuario descargar pdf (Pagina 427)

100

101

Managing the AMASS File System

6-00028-01 Rev A Fine-tune Block Size B-5

Correlate with

READ-BLOCK

LIMIT

A SCSI drive writes to tape in a fixed block segment determined

by the READ-BLOCK LIMIT of the drive. This means that at the

end of every write, the last block segment may hold less than

one full block of data. Although this may not, at first, impact

performance, it does waste tape resources if the “average” file

size is small and the -b blocksize has been configured for larger

file sizes. This concept is illustrated below.

Tip

The configurable -b blocksize should evenly divide into the

MAXIOSZ value. This concept is illustrated below.

MAXIOSZ

Size of each tape block

divides evenly into MAXIOSZ.

1/4

Tape

Block

Size

1/4

Tape

Block

Size

1/4

Tape

Block

Size

1/4

Tap e

Block

Size

Last segment may be less than full of

client’s data.

Subsequent writes start in this contiguous segment.

If many partially filled segments exist, space is

wasted on the tape.

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ADIC Time Clock 6-00028-01 Rev A Manual de usuario Pagina 427

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