Default size of shared data buffers

Article:HOWTO56152  |  Created: 2011-07-25  |  Updated: 2012-01-24  |  Article URL http://www.symantec.com/docs/HOWTO56152
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Default size of shared data buffers

The default size of shared data buffers for various NetBackup operations is shown in Table: Default size of shared data buffers.

Table: Default size of shared data buffers

NetBackup operation

Size of shared data buffers

UNIX

Size of shared data buffers

Windows

Non-multiplexed backup

64K (tape), 256K (disk)

64K (tape), 256K (disk)

Multiplexed backup

64K (tape), 256K (disk)

64K (tape), 256K (disk)

Restore, verify, or import

same size as used for the backup

same size as used for the backup

Duplicate

read side: same size as used for the backup

write side: 64K (tape), 256K (disk)

read side: same size as used for the backup

write side: 64K (tape), 256K (disk)

NDMP backup

64K (tape), 256K (disk)

64K (tape), 256K (disk)

On Windows, a single tape I/O operation is performed for each shared data buffer. Therefore, this size must not exceed the maximum block size for the tape device or operating system. For Windows systems, the maximum block size is generally 64K, although in some cases customers use a larger value successfully. For this reason, the terms "tape block size" and "shared data buffer size" are synonymous in this context.

See Default number of shared data buffers

See How to change the number of shared data buffers

See How to change the size of shared data buffers


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