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BAR_MAX_BACKUP

Posted in 2014

Summary

User increased BAR_MAX_BACKUP from 1 to 4 for parallel backup streams and asked how to verify it's working. Resolution: Check online.log and BAR_ACT_LOG for multiple "Level 0 Archive started" messages (one per dbspace) instead of a single combined message, use "onstat -g ntt|grep ontape" to see 4 threads, or run "ps -ef | grep onbar". With BAR_MAX_BACKUP=1, archives show all dbspaces in one line; with 4, each starts separately.

Auto-generated by DrWatson from the posts below — may be imperfect; read the full thread.

Topics: General Discussion

LESTER POLICARPIO — — source: IIUG Forums & Mailing Lists

Hi, Good Day we tried increasing the value of BAR_MAX_BACKUP from default (1) to 4 to increase the number of streams when running the backup to speed up the process. My question now is how can I really verify that the value was indeed changed I mean other than backup should be faster how can I check that it is already using 4 streams than the default value 1. Many Thanks in Advance

↪ replying to LESTER POLICARPIO
NITIN MATHUR — — source: IIUG Forums & Mailing Lists

Hi, If you run onstat -g ntt|grep ontape you will see 4 threads. Also you can check online log which tells that multiple dbpsace backups started. regards, Nitin

↪ replying to LESTER POLICARPIO
Stuart Brooks — — source: IIUG Forums & Mailing Lists

Look in your online.log and BAR_ACT_LOG. You should see messages such as: Level 0 Archive started on dbspace01 Level 0 Archive started on dbspace02 Level 0 Archive started on dbspace03 Level 0 Archive started on dbspace04 When one dbspace completes another should start. Also in you BAR_ACT_LOG you should see 4 process successfully forked messages. Or just "ps -ef | grep onbar" --- Ardenta Limited is ISO/IEC 20000-1 certified. We are proud to be named IT Supplier Of The Year 2014 and 2013 at eGR B2B Awards. Ardenta Limited is a company registered in England and Wales. Registered number: 4181041. Registered office: Saxon House, Downside, Sunbury on Thames, Middlesex, TW16 6RT. -----Original Message----- From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of LESTER POLICARPIO Sent: 07 November 2014 02:29 To: ids@iiug.org Subject: BAR_MAX_BACKUP [34118] Hi, Good Day we tried increasing the value of BAR_MAX_BACKUP from default (1) to 4 to increase the number of streams when running the backup to speed up the process. My question now is how can I really verify that the value was indeed changed I mean other than backup should be faster how can I check that it is already using 4 streams than the default value 1. Many Thanks in Advance ******************************************************************************* Forum Note: Use "Reply" to post a response in the discussion forum.

↪ replying to Stuart Brooks
LESTER POLICARPIO — — source: IIUG Forums & Mailing Lists

Hi, thanks you for the feedback if the result should really be like below when stream is set to 4 Level 0 Archive started on dbspace01 Level 0 Archive started on dbspace02 Level 0 Archive started on dbspace03 Level 0 Archive started on dbspace04 then I would like to ask what should be the normal result when the stream is only set to 1? should it be? Level 0 Archive started on dbspace01, dbspace02,dbspace03,dbspace04 Thanks in advance appreciate all the help the you have given

↪ replying to LESTER POLICARPIO
LLOYD SERRAO — — source: IIUG Forums & Mailing Lists

Lester, You are right, when BAR_MAX_BACKUP is set to 1 you will see the below output. Level 0 Archive started on dbspace01, dbspace02,dbspace03,dbspace04 Thanks, Lloyd

↪ replying to LLOYD SERRAO
LESTER POLICARPIO — — source: IIUG Forums & Mailing Lists

Hi, Confirmed!! Many thanks to all Cheers,

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