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Classics Forum

Ontape Backup Errors

Posted By: CHESLEY BRION
Date: Friday, 4 January 2013, at 3:09 p.m.

System
Solaris 2.6, Informix-Online Version 7.23.UC4, Ontape Utility

Background

We have been using this system since 1998. We support 13 instances, ranging in size from 4-6 GB. We use the ontape utility to do level 0 backups only. No problems, one tape per backup. The TAPESIZE parameter set to 200 GB. The TAPEBLK parameter set to 16 KB. Using an Eliant tape drive, Exabyte 160 mxl tapes, capacity 7 GB uncompressed and 14 GB compressed. We do not expect much relief from compression, so we always planned in the 4-6 GB range.

Recently, we added another instance, size just over 6 GB. Ontape fails after 90 per cent complete, error number 28 (end of tape). We would expect that since the TAPESIZE parameter does NOT reflect the actual tape size.

We set the TAPESIZE to 6 GB, trying to force ONTAPE to a Request Tape 2 scenario. Did not work. Same failure, same errno. Tested using TAPESIZE set to 100 MB. ONTAPE worked as expected, issued the TAPE FULL message and requested Tape 2.

We set the TAPESIZE to 5 GB (more than 10% reduction from 7 GB), trying to force ONTAPE to a Tape 2 request scenario. Did not work. Same failure, same error no 28.

We set the TAPESIZE to 4 GB, again, well under the capacity of the Tape 160 mxl (7GB). ONTAPE went to the Tape 2 Scenario at 90% complete. We installed Tape # 2 and the backup completed successfully.

My questions:

1) why would the tape full condition not force the Request Tape #2 scenario versus the tape full scenario?
2) how does ONTAPE determine that the maximum amount of data has been written to tape?
3) is there a means to determine how much space will be needed to do a level 0 (and level 1) backup?

- using oncheck, adding up chuck sizes or data page sizes?
4) when does ONTAPE check the remaining amount of space on the tape?
5) when an initial extent size is set for a table, the entire extent space is allocated to the table. Is the entire extent backed up or just that portion currently used by the table?

Thanks in advance..Chet

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