How to Configure RMAN I/O Block Size to Improve Backup and Recovery Performance [ID 107213.1]
Modified 19-OCT-2010 Type BULLETIN Status PUBLISHED
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This article describes a solution that was used to resolve this
issue for another Oracle customer. As it relates to a third-party
product, Oracle does not guarantee that this resolution will work
for all customers using this or any other third-party product. The
appropriate third-party vendor should be contacted if there are any
questions or problems relating to this resolution or these errors.
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PURPOSE
This document is to show how to configure rman i/o block size to improve
backup/recover performance.
SCOPE & APPLICATION
This is intended for all RMAN users.
How to configure RMAN I/O block size to improve backup/recover performance:
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The I/O block size is the 'unit' RMAN reads and writes to the tape device.
Larger block size can improve backup/recover performance, especially
if the the database is large.
The default I/O block size is operating system and third party backup software
dependent, but can be changed from within RMAN. Use the allocate channel step:
ALLOCATE CHANNEL t1 TYPE 'sbt_tape' PARMS ="BLKSIZE=4194304"
This will allocate a channel for backup/recover with I/O block size 4M.
I/O block size can also be specified from EBU: use parameter tape_io_size in
backup/recover script.
References:
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Oracle8i Backup and Recovery Guide
Search Words:
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BLKSIZE RMAN TAPE_IO_SIZE
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