IDS Forum

Re: Ontape to backup Logical logs - Query

Posted By: Art Kagel
Date: Wednesday, 18 February 2009, at 11:39 a.m.

In Response To: Ontape to backup Logical logs - Query (VIKAS HIVARKAR)

So, to clarify, your question is "Now that ontape instances create a
uniquely named temp file, can I run multiple copies of 'ontape -a' to backup
the logs in parallel to get them on disk faster?"

I would confidently say that the answer is no. Logical log archives are
always sequential, one log at a time. A single ontape -a instance will
indeed back up all logs that are ready to back up and will indeed also pick
up logs that complete while it is running, but it's a single sequential
process.

Art

On Wed, Feb 18, 2009 at 4:57 AM, VIKAS HIVARKAR <vikas.hivarkar@gmail.com>wrote:

> Hello,
>
> IDS 11.10.FC3 on solaris 10.
>
> #Please consider this as a query and not a problem yet.
> #I know the my logical logs are small in size(500+, 20M each) for taking
> some
> hectic transactions BUT not possible to to increase the log size atleast
> for
> now.
>
> In 11.10.FC2W4 i faced a bug with parallel ontapes running for backing up
> the
> logical logs & resulting in Loss of logical logs files.
> (ontape to directory feature used. Alarmprogram.sh to backup the logs)
>
> One of the workaround was to check if ontape is running, some thing like:
> "ps -aef | grep "ontape -a -d" |grep -v grep |" in the alarmprogram.sh
> script
> before a new ontape is invoked.
>
> I did all this in order to avoid new ontape when one is already in
> progress.
>
> Now I have 11.10.FC3 with the bug fix, the first thing i checked in my
> testings was the name for temp file which now i see unique for every temp
> file
> generated/used by ontape before writing to permanent file on the disk.
>
> I also see that now IDS is not allowing another ontape to run untill one is
> already running: (May be i am not correct on this).
> ------ontape's output---------
> Performing automatic backup of logical logs.
>
> Logbackup failed - A Log backup is already in progress.
>
> Program over.
>
> Performing automatic backup of logical logs.
>
> Logbackup failed - A Log backup is already in progress.
> -----------------------------
> Thanks to detailed explanation by Martin, I understand that the ontape
> which
> is already running would backup all the logs that are filled & are
> available
> to be backed up, infact it would check if another log is near to complete
> so
> that it can also be backed up. So Every logical log file would be backed
> up.
>
> BUT it worries me when i see:
>
> 3180dd9e8 342 U-B---- 64216 5:3290053 10000 10000 100.00
> 3180dda50 343 U-B---- 64217 5:3300053 10000 10000 100.00
> 3180ddab8 344 U-B---L 64218 5:3310053 10000 10000 100.00
> 3180ddb20 345 U-B---- 64219 5:3320053 10000 10000 100.00
> 3180ddb88 346 U------ 64220 5:3330053 10000 10000 100.00
> 3180ddbf0 347 U------ 64221 5:3340053 10000 10000 100.00
> 3180ddc58 348 U------ 64222 5:3350053 10000 10000 100.00
> 3180ddcc0 349 U------ 64223 5:3360053 10000 10000 100.00
> 3180ddd28 350 U------ 64224 5:3370053 10000 10000 100.00
> 3180ddd90 351 U------ 64225 5:3380053 10000 10000 100.00
> 3180dddf8 352 U------ 64226 5:3390053 10000 10000 100.00
> 3180dde60 353 U------ 64227 5:3400053 10000 10000 100.00
> 3180ddec8 354 U------ 64228 5:3410053 10000 10000 100.00
> 3180ddf30 355 U------ 64229 5:3420053 10000 10000 100.00
> 3180ddf98 356 U------ 64230 5:3430053 10000 10000 100.00
> 3180de028 357 U------ 64231 5:3440053 10000 10000 100.00
> 3180de090 358 U------ 64232 5:3450053 10000 10000 100.00
> 3180de0f8 359 U------ 64233 5:3460053 10000 10000 100.00
> 3180de160 360 U------ 64234 5:3470053 10000 10000 100.00
> 3180de1c8 361 U------ 64235 5:3480053 10000 10000 100.00
> 3180de230 362 U------ 64236 5:3490053 10000 10000 100.00
> 3180de298 363 U------ 64237 5:3500053 10000 10000 100.00
> 3180de300 364 U------ 64238 5:3510053 10000 10000 100.00
> 3180de368 365 U------ 64239 5:3520053 10000 10000 100.00
> 3180de3d0 366 U------ 64240 5:3530053 10000 10000 100.00
> 3180de438 367 U------ 64241 5:3540053 10000 10000 100.00
> 3180de4a0 368 U------ 64242 5:3550053 10000 10000 100.00
> 3180de508 369 U------ 64243 5:3560053 10000 10000 100.00
> 3180de570 370 U------ 64244 5:3570053 10000 10000 100.00
> 3180de5d8 371 U------ 64245 5:3580053 10000 10000 100.00
> 3180de640 372 U---C-- 64246 5:3590053 10000 4107 41.07
> 3180de6a8 373 U-B---- 63661 5:3600053 10000 10000 100.00
> 3180de710 374 U-B---- 63662 5:3610053 10000 10000 100.00
> 3180de778 375 U-B---- 63663 5:3620053 10000 10000 100.00
> 3180de7e0 376 U-B---- 63664 5:3630053 10000 10000 100.00
>
> What if now the engine goes down?
>
> Sure Ontape is running and would backup all these files.
> Sure my logical log size needs to be increased atleast to 100M(i had to
> convience a lot to increase it from 5M to 20 M and still working to get it
> atleast 100M).
> Sure IDS is working as it designed to work.
>
> With the fix as unique names for temp files i was under wrong impression
> that,
> now ontape(s) now can run parallely with out over writing each others temp
> files and backup the logs, instead of one running and doing all the work.
>
> May be i'm totally wrong here hence Any information regarding this is
> appreciated.
>
> Regards,
> Vikas
>
> P.S: Better to read than to fall in guesstimation but i dont know if there
> are
> any documents released/written explaining the change made.
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>

--
Art S. Kagel
Oninit (www.oninit.com)
IIUG Board of Directors (art@iiug.org)

Disclaimer: Please keep in mind that my own opinions are my own opinions and
do not reflect on my employer, Oninit, the IIUG, nor any other organization
with which I am associated either explicitly or implicitly. Neither do
those opinions reflect those of other individuals affiliated with any entity
with which I am affiliated nor those of the entities themselves.

--00163683222a81906a0463340fcb

Messages In This Thread

• Ontape to backup Logical logs - Query
  VIKAS HIVARKAR -- Wednesday, 18 February 2009, at 4:57 a.m.
  • Re: Ontape to backup Logical logs - Query
    Martin Fuerderer -- Wednesday, 18 February 2009, at 5:27 a.m.
    • Re: Ontape to backup Logical logs - Query
      VIKAS HIVARKAR -- Wednesday, 18 February 2009, at 6:30 a.m.
      • Re: Ontape to backup Logical logs - Query
        rroussey@comcast.net -- Wednesday, 18 February 2009, at 1:54 p.m.
  • RE: Ontape to backup Logical logs - Query
    Penza Kenneth at MITA -- Wednesday, 18 February 2009, at 8:32 a.m.
  • Re: Ontape to backup Logical logs - Query
    Art Kagel -- Wednesday, 18 February 2009, at 11:39 a.m.

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