TAPE Backup Slower On ACFS Compared To Local Filesystem

(Doc ID 2322826.1)

Last updated on OCTOBER 31, 2017

Applies to:

Oracle Database - Enterprise Edition - Version 12.1.0.2 and later
Information in this document applies to any platform.

Symptoms

TAPE Backup Slower on ACFS compared to Local Filesystem

We are currently using ACFS filesystems on RAC server to take RMAN backup.

For RMAN backup, we are not seeing any issues, however, while we run the TAPE backup on ACFS, we are seeing the throughput compared to local filesystem is much slower. Which is causing TAPE backup to run for much much longer for bigger databases.

Based on our analysis done with TAPE backup team, bottleneck seems to be on ACFS side, where we are getting slow speed while copying the data to TAPE.

File transfer speed on Local file system - 65-70 MB/sec
File transfer speed on ACFS - 20-25 MB/Sec

Server Details -

RAC with ACFS (12.1.0.2 RAC DB)
Linux asrac12345.com 3.10.0-327.36.3.el7.x86_64 #1 SMP Thu Oct 20 04:56:07 EDT 2016 x86_64 x86_64 x86_64 GNU/Linux

Non-RAC with Local FS (11.2.0.2 DB)
Linux asdbs12345.com 3.10.0-327.36.3.el7.x86_64 #1 SMP Thu Oct 20 04:56:07 EDT 2016 x86_64 x86_64 x86_64 GNU/Linux


Cause

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