Re: slow rman compression on exadata x8-m to zfs
- From: Mladen Gogala <gogala.mladen@xxxxxxxxx>
- To: Michael McMullen <ganstadba@xxxxxxxxxxx>, "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 7 Dec 2021 21:42:55 -0500
On 12/7/21 12:53, Michael McMullen wrote:
Backups are run from a separate vm, but it doesn't matter. rman
target=/ gives the same result.
I've set compression on the zfs. Just trying to find a root cause.
Hi Mike,
You should also get Oracle involved and open a SR. Oracle provides very
comprehensive support for their engineered systems. You should also do
strace on the rman processes and see where do they spend time. You can
also use perf record -p <pid> to record where the processes are spending
time. It looks like the most of your rman channel processes are
sleeping. 500 MB/sec is what only a single channel should be able to
do. You should be able to find out by using ps -ef|grep rman Please run
rman with debug=all log=/tmp/rman_debug.log parameters.
To tell the truth, this looks like a bug in rman, changing behavior when
compression is used.
Regards
--
Mladen Gogala
Database Consultant
Tel: (347) 321-1217
https://dbwhisperer.wordpress.com
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