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IDS Forum

Re: IDS 9.21 Backup/Recover strat with HDR

Posted By: Martin Fuerderer
Date: Friday, 1 July 2005, at 9:20 a.m.

In Response To: IDS 9.21 Backup/Recover strat with HDR (TANYA GALLEGOS)


since you now use ON-Bar, with which storage manager do you use it ?

- ON-Bar:
- can do backup and restore in parallel, which generally will be faster
than serial ontape.
- can work unattended, especially helpful for log backup.
- you have to use a storage manager.
- you can use ISM, but it doesn't do remote operation, so restore
for secondary (HDR) will be "imported restore" which is somewhat

- ontape:
- no storage manager needed.
- transfer of backup to secondary and restore is simple.
- only serial operation, nothing is parallel.
- continuous log backup with ontape will (periodically) halt and require
user interactivity to change tapes (LTAPEDEV).
- 2 GB limit for files may hit you (I see you're already aware of this).

- changes necessary:

- switching from current ON-Bar to ontape:
- you probably backup the logs via ALARMPROGRAM and ON-Bar (now),
so you should change ALARMPROGRAM parameter in onconfig file
(e.g. from .../ to .../
This change will require a server restart, but not a long down time.
- alternatively you can directly edit the shell script currently
configured in
ALARMPROGRAM. This can be done without server down time.
Though eventually you should change ALARMPROGRAM to reflect
the reality, but that can be done during some other, planned down
- LTAPE... and TAPE... onconfig parameters are mainly used by ontape
only. The only significant value for the server is, whether LTAPEDEV
"/dev/null" or not. Since you do not have "/dev/null" now, you can
LTAPEDEV to any value (other than "/dev/null") without effect on
That means LTAPE... and TAPE... parameters can be changed without
requiring server down time.

- switching ON-Bar from backup to tape to backup to disk:
- I've not done this particular thing before, but I think it will
changes in storage manager only. Therefore no server down time
should be required.

Hopefully this gives you some ideas.

As already recommended by others, I strongly advice to
test things, possibly with a small HDR pair of test instances.
Include the restore for secondary in your tests, so you get a good
picture (and a step-by-step procedure) of how to do that in your
particular environment.

-- wrote on 01.07.2005 00:08:22:
> I have IDS 2000 9.21.UC4 running on SUNOS 5.8. I'm using HDR, currently
have onbar running for nightly
> level 0 archive and logical log backups. Its writing to a small
unsupported Legatto tape drive.
> I need to change the Backup and Recovery strategy from tape to disk and
am looking for the best/easiest transition.
> I have disk space now, but not sure if it will be better to switch to
ontape or stay with onbar and use ISM.
> I have limited down time, no test system and need to be sure I can back
out if necessary.
> We're working on scripts to break the archive into 2 gig files and
> an alarmprogram script.
> I believe I need to change the tapedev and ltapedev parameters and
utilize the ISM parameters in both onconfig
> files. Short down time required.
> If anyone has some advice or direction it would be greatly appreciated.

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