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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v19527723_v42806492

Article URL http://www.symantec.com/docs/HOWTO56152

Default size of shared data buffers

Default size of shared data buffers

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