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IDS Forum

backup_filter gzip ontape duration llog backupsize

Posted By: ALEKSANDAR IVANOVSKI
Date: Saturday, 11 March 2017, at 8:32 a.m.

Dear Group,
I've got informix 11.7 in heritage that did not have any logical log backups whatsoever. Furthermore it was running nightly full ontape backup, which lasted 1H and 10min and makes a file around 600GB. Since there is a disc capacity constraint the next night the backup is overwritten. So in my opinion if something goes wrong with the engine within this 70minutes, we are completely out?
What I did is added another ontape L0 backup before it, using a pigz compression which leads me to a ~70GB compressed file in 90min. , which is perfect.
Idea behind having 1 large and 1 small file is in case of restore need, not to have to wait on decompression.

Now I added llog backups to disk. I put compression in the onconfig file gzip and gunzip, so the llog backups are now much much smaller.
However once i run ontape, (without pigz) it takes 4hours (since i guess there is a congesstion on the gzip process). Have set LTAPESIZE to 2097152, just following the documentation (othervise the alarm won't fire wiht this setting set to 0)
http://www.informix-dba.com/2010/07/informix-backup-and-restore-bare.html

Now my questions are:
1. is this parameter actually taken into consideration if i am doing disk backups?
2. is there any tweak to continue using pigz for nightly backups, but use gzip in the filter settings of onconfig. My final point is to have gzip-ed llogs and fast nightly backup on disk.
3. is there any way I can do a script which will delete all these small llog backups once they are not needed any more (I cannot find a way once the new ontape file is there that logs lower than xx id can be deleted)?

Thank you
Aleksandar

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