Re: Onbar backup using Tivoli Storage Manager
- From: Martin Fuerderer <MARTINFU@xxxxxxxxxx>
- Date: Tue, 18 Sep 2007 11:14:14 +0200
Hi,
when you are using ON-Bar as backup and restore tool, then
ON-Bar will always send all backup objects to the storage
manager (SM) and will retrieve restore objects from the SM.
What the SM does with these objects is a configuration matter
within the SM.
I do not know TSM well enough to tell you the TSM configuration
for backup to and restore from disk, but I'm sure TSM can
somehow be configured to keep objects on disk rather than
on tapes. (Usually it is a matter of device and pool definitions.)
When you are using ontape as backup and restore tool, then
ontape will always use the TAPE... and LTAPE... parameter
definitions from your onconfig file. Generally the parameters
TAPEDEV and LTAPEDEV can be tape devices or files.
You are then responsible for handling the files (before ontape
overwrites them after requesting a new "tape").
In IDS 11.10 there is a new feature that allows you to specify
a directory for TAPEDEV and a (different) directory for
LTAPEDEV. In that case ontape will "make up" filenames
for the different objects (level-0, level-1, level-2 archives and
logical logs). These files will then be placed in the respective
directory. Thus you are no longer responsible yourself for
the files to prevent ontape from overwriting them. However,
you are still responsible for managing the files so that the
file system does not get full ...
Apart from these possibilities, there also is external backup
and restore (EBR). This is for dbspace objects only and
external backups are always like level-0 backups.
There is no external backup and restore for logical logs.
When using EBR you would combine that with logical log
backup/restore using either ON-Bar or ontape. EBR is
available since quite some time (not just since IDS 11.10).
It is recommended to not mix the backup restore tools.
It generally is better (and easier) to decide for one (ON-Bar
or ontape) and then use that consistently. It is possible
to mix things, but makes it more complicated, not only the
backup, but also the restore routine. And normally you want
to keep the latter rather simple, because often it is exercised
in a rather stressful situation.
Regards,
Martin
--
Martin Fuerderer
IBM Informix Development Munich, Germany
Information Management
IBM Deutschland GmbH
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informix-list-bounces@xxxxxxxx wrote on 17.09.2007 21:16:48:
Hi guys,
Is it possible to send logs backup of informix to disk using TSM?
How can this task be achieved? I understand that ontape uses LTAPEDEV
and whenever you use onbar and a storage manager to backup Informix,
TAPEDEV and LTAPEDEV are ignored and all the
mechanism control is being given to the storage manager.
Using onbar with TSM, how does one configure Informix or TSM to
send the logs to a location other than the storage device attached
to the TSM server. Is this doable?
From past experience with other storage manager, I will definemy pool, volume , device and type within the storage manager to
take care of that piece, but recently I am told by someone from
IBM that the same results can be obtained by configuring
informix itself to direct the logs to another location.
Is this a mixed up between onbar and ontape backups. Please advise!
Ideas and thoughts are greatly appreciated.
Regards,
Josue P._______________________________________________
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