ADIC Time Clock 6-00028-01 Rev A Manual de usuario descargar pdf (Pagina 426)

100

101

Managing the AMASS File System

B-4 Fine-tune Block Size 6-00028-01 Rev A

• Read the drive manufacturers published data on your drive’s

performance and block size

Some of these parameters are described below.

Correlate with File

Size

To improve performance on file systems with large files, it is

generally better to have AMASS write to a tape with a large

block size. On the other hand, on file systems with smaller files,

it is generally better to have AMASS write to a tape with a

smaller block size. This concept is illustrated below.

Correlate with

MAXIOSZ

Calculating a block size for tape media must be correlated with

the MAXIOSZ parameter. The MAXIOSZ is defined when

installing AMASS and is the maximum size, in bytes, that

AMASS uses to transfer data to and from the cache. The

MAXIOSZ value varies depending on the operating system

AMASS is installed on. For more information on MAXIOSZ,

refer to “MAXIOSZ” in Installing AMASS.

Writing large files to a tape with a large block size

takes less time, thus improves performance.

Writing smaller files to a tape with a smaller block

size does not waste space on the tape.

Tape Media

Caution

If you change the MAXIOSZ value after using AMASS, you may not

be able to read or write to previous volumes that were formatted

with the old MAXIOSZ parameter. At the very least, you will see a

significant decrease in throughput.

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