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RE: onbar restore blocked on checkpoint

Posted By: JOHAN BACKLUND
Date: Tuesday, 18 March 2008, at 12:20 p.m.

In Response To: RE: onbar restore blocked on checkpoint (Martin Fuerderer)

Hi,
> I would (again) like to know in more detail, what onbar
> is doing when the logical log restore phase begins
> (or should begin). At one point (I think) you said that
> there is no message in the ON-Bar activity log file,
> but this sounds a bit strange.
Sorry for the confusion, but I meant that there were no error messages reported in the ON-Bar activity log. The last lines in the ON-Bar activity log shows:
2008-03-18 13:55:38 2900 2900 Completed restore logical log 493.
2008-03-18 13:55:38 2900 2900 Begin restore logical log 494 (Storage Manager copy ID: 0 792714572).
2008-03-18 13:55:57 2900 2900 Completed restore logical log 494.
2008-03-18 13:55:58 2900 2900 Begin restore logical log 495 (Storage Manager copy ID: 0 793388666).
2008-03-18 13:56:15 2900 2900 Completed restore logical log 495.
...where log 495 is the last log that should be restored.
> To me it is not clear whether onbar was able to restore
> any logical log files or no log files were restored at all.
> Does the hang occur before any log file is restored?
> Or after some log files, but not all those necessary, were
> restored? Or does the hang occur after all necessary
> log files were restored?
The hang occurs after all necessary log files have been restored. In the last lines of online.log there is:
13:56:16 Maximum server connections 0
13:56:16 Checkpoint Completed: duration was 0 seconds.
13:56:16 Checkpoint loguniq 495, logpos 0x1374290, timestamp: 0x1ec3f9fc
13:56:16 Maximum server connections 0
13:56:20 Logical Recovery has reached the transaction cleanup phase.
...and that is where it all stops and leaves the instance in this state:
IBM Informix Dynamic Server Version 10.00.TC6X2 -- Fast Recovery (CKPT REQ) -- Up 04:33:37 -- 1149120 Kbytes
Blocked:CKPT
>In the latter case it would most probably be a problem
>in the server. In the other two cases it may well be a
>problem of onbar (and/or the SM or its configuration).
I've been trying to dig through the thread stacks and I do see the threads waiting for the checkpoint to complete (the ontape thread). However, I do not see the checkpoint() function being called by the main_loop thread which I think is the normal sign of a checkpoint in action - the main_loop thread is just sitting there with
0x00ab876a (oninit)_mt_yield(0x1, 0x0, 0x50879c00, 0x0)
0x004050a3 (oninit)_main_loop(0x0, 0x0, 0x0, 0x0)
0x00ae1814 (oninit)_startup
> To get more info from onbar it is possible to switch on
> some tracing by setting the onconfig file parameter
> BAR_DEBUG to a value like 6 (medium tracing).
> You also need to set parameter BAR_DEBUG_LOG
> to an absolute file pathname, so that the information
> can be written to that file.
I will make a new run again first thing tomorrow with increased debug levels on both Onbar and TSM.
cheers
Johan

Messages In This Thread

onbar restore blocked on checkpoint
JOHAN BACKLUND -- Monday, 17 March 2008, at 9:18 a.m.
- Re: onbar restore blocked on checkpoint
  JOHAN BACKLUND -- Monday, 17 March 2008, at 12:05 p.m.
  - RE: onbar restore blocked on checkpoint
    Everett Mills -- Monday, 17 March 2008, at 12:41 p.m.
    - Re: RE: onbar restore blocked on checkpoint
      JOHAN BACKLUND -- Tuesday, 18 March 2008, at 3:49 a.m.
      - Re: RE: onbar restore blocked on checkpoint
        NORMA JEAN SEBASTIAN -- Tuesday, 18 March 2008, at 8:59 a.m.
        
        RE: onbar restore blocked on checkpoint
        JOHAN BACKLUND -- Tuesday, 18 March 2008, at 9:47 a.m.
        
        RE: onbar restore blocked on checkpoint
        Martin Fuerderer -- Tuesday, 18 March 2008, at 11:23 a.m.
        
        Re: RE: onbar restore blocked on checkpoint
        NORMA JEAN SEBASTIAN -- Tuesday, 18 March 2008, at 11:31 a.m.
        
        RE: onbar restore blocked on checkpoint
        JOHAN BACKLUND -- Tuesday, 18 March 2008, at 12:20 p.m.

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