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I/O errors during backup

Posted By: JACQUES LAPEIRE
Date: Friday, 16 January 2009, at 8:54 a.m.

Hi Guys,
on an old installation I inherited, I have the following issue :
Informix Dynamic Server 7.31 UC6
Mips Platform running Reliant Unix.
2 I/O errors (with a history) appear during the backup with ontape.
But backup seems to complete anyway.
116942 20:02:26 Level 0 Archive started on rootdbs, patient
116943 20:05:03 I/O read chunk 1, pagenum 14047, pagecnt 1 --> errno = 5
116944 20:05:03 I/O read chunk 1, pagenum 14047, pagecnt 1 --> errno = 5
116945 20:07:57 Checkpoint Completed: duration was 10 seconds.
116946 20:09:27 Logical Log 26683 Complete.
116947 20:09:28 Logical Log 26683 - Backup Started
116948 20:09:38 Logical Log 26683 - Backup Completed
116964 21:09:42 Logical Log 26684 Complete.
116965 21:09:44 Logical Log 26684 - Backup Started
116966 21:09:53 Logical Log 26684 - Backup Completed
116975 21:50:52 Archive on rootdbs, patient Completed.
First question, is this backup reliable ?
(onstat -g arc indicates 20u02 which is the startime of the backup)
The history of the I/O errors :
Complete database (only 2 dbspaces) is on slice 0 of a LUN (RAID5)
Some time ago the OS reported read errors on D200 (part of RAID5),
but no actions were taken, application ran fine.
A couple of days ago, the disk D500 (part of same RAID5) completely failed,
raid was in degraded mode.
After a while informix was blocked, last logical log in use, logical logs
could not be backed up (read error).
Got informix running again by changing LTAPEDEV to /dev/null (lost some
logical logs), removed the logical log causing the problem, and took a level0 backup.
OK informix running again.
Then raid-intervention replace D500, got 3 read errors but raid was rebuild to optimal state.
During 2 days no error-messages.
Yesterday evening D200 (with the original read-error) was also replaced and raid was rebuild to optimal state.
But backup afterwards generates error-messages again.
To exclude the OS and HW, we will try a dd-command to read the entire slice
If the problem is informix-related, are there any suggestions, other than unloading and re-initialising the database ?
Thx for any reactions,
Jacques Lapeire

Messages In This Thread

I/O errors during backup
JACQUES LAPEIRE -- Friday, 16 January 2009, at 8:54 a.m.
- Re: I/O errors during backup
  Art Kagel -- Friday, 16 January 2009, at 11:00 a.m.

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