Re: Puzzling System Action -- MIDRANGE-L

1) When you start mirroring on ASP, which contains RAIDed drives, system
will consider RAIDed drives already proctected and will leave them alone.
Only non-RAID protected drives will be paired.
In other words, if you have ASP containing only RAID-protected drives,
starting mirroring for them will not change anything.
If you really want mirrored protection, stop RAID-protection for drives in
ASP, and then start mirroring.

4 and 5) QDBJRN (in QRECOVERY) is an internal system journal, which
protects system dictionary files (QADBxxx). System takes care of this
journal automatically, so normally user does not need to do anything about
it. If you want to reset sequence numbers, try to do it in a restricted
state.

6) When SMAPP is active (EDTRCYAP), system may write internal - invisible -
entries to journals. These entries record changes to not-journaled access
paths.These entries cannot be accessed by user, but they do consume
sequence numbers.

Best regards
    Alexey Pytel



Dave Mahadevan <mahadevan@fuse.net> on 04/26/99 12:43:39 PM

Please respond to MIDRANGE-L@midrange.com

To:   midrangel <MIDRANGE-L@midrange.com>
cc:    (bcc: Alexei Pytel/Rochester/IBM)
Subject:  Puzzling System Action





Folks:

First a few facts:

I added 9337 EMC equivalent painted RAID 5 into a new asp on system
running V3R2 with the latest cum ptf.  I asked for mirror and it did
Device Parity and when working DPY/Active.  I copied a library into the
new asp.  It was done when there was almost no activity on the system.
I checked the copied library.  About two thirds were copied fine.  The
others had been copied with 0 records.  History log showed that some
these files with 0 records had been extended by at least one increment!
No error messages on the log excepting some info messages on QDBJRN as
follows.

 Size of member HPGMFILE increased 1 increments.
 Journal receiver QDBJRN0596 created in library QRECOVERY.
 Journal receivers QDBJRN0595 and *N detached.
 Sequence number not reset. First sequence number is 43625.
 Size of member MPENSION increased 1 increments.

IPLed the system.  Still records 0 in these files.

Ok.  Decided to get back to it later.   Now did some updating on a file
and added records to another file in a library in another asp.  No
commitment control.  Records were added to one file but records were not
updated on the second file.  Added records did not show up on read but
were in the file on a DSPPFM.   I have access path maintenance set to
*IMMED.  No user complaints of any other updates etc.  Completely
puzzled.  Asked for an IPL and went home.  Checked the files after IPL,
everything was updated and added records showed up on read.  These files
are not journaled.  Decided to take no chance, ran QDBRCLXR  and
RCLSTG.  No error messages.
 Message . . . . :   Data base objects destroyed by reclaim storage
operation.
 Cause . . . . . :   0 directories, 0 formats, and 0 recovery objects
were
   destroyed by the reclaim storage operation.  The data base objects
that were
   destroyed either were damaged, or associated with damaged or
destroyed data
   base files.
RCLSTG processing complete. 105352 objects processed. 53 deleted.

And about a dozen of the following before the RCLSTG message above:

 Journal receivers QDBJRN0612 and *N detached.
 Sequence number not reset. First sequence number is 180819.
 Journal receiver QDBJRN0614 created in library QRECOVERY.
 Journal receivers QDBJRN0613 and *N detached.
 Sequence number not reset. First sequence number is 196074.

Questions:

1.  Why did not the mirroring half the availalble disk space on the
RAID5 asp?

2.  Why did not the copy lib work on some files with no error messages
(yes I checked thoroughly)?

3.  Why did not the files update and added records show up (this program
has been used hundreds of times and updated/added records show up
immediately).

4.  Although everything is ok now, I have a quezy feeling about this
episode.  What is the purpose of the QDBJRN?

5.  How do I reset the sequence number on this QDBJRN.  I used the
CHGJRN with *GEN and *RESET which produced the following CPF7018:
                         Additional Message Information

 Message ID . . . . . . :   CPF7018       Severity . . . . . . . :   40
 Message . . . . :   Resetting sequence number not allowed. Reason code
1.
 Cause . . . . . :   The sequence number for journal QDBJRN in library
   QRECOVERY cannot be reset because of reason code 1. The reason codes
and
   their meanings follow:
     1 -- A file being journaled to journal QDBJRN has changes that have
not
   been forced to auxiliary storage, or one or more access paths are
being
   journaled and either a clear physical file member (CLRPFM) command or
a
   reorganize physical file member (RGZPFM) command is in progress for
one or
   more of the members that the access paths are built over.
I do have some files journaled.  Does this required a restricted system?

6.  Why did the sequence numbers on the QDBJRN jump by almost 100,000?

7.  Anybody had good/bad experience with EMC HX3SR RAID5 (equivalent to
9337-242 & 9337-243)?  I love EMC ...  good and cost effective.

Please reply your comments, criticisms, suggestions, words of wisdom,
work arounds,  workins,  workouts  etc. to the list so others can
benefit too. :-)

--
Thank You.

Regards

Dave Mahadevan.. mailto:mahadevan@fuse.net


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