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Conference smurf::dec_mls_plus

Title:dec_mls_plus
Moderator:SMURF::BAT
Created:Mon Nov 29 1993
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:534
Total number of notes:2544

491.0. "KZPSA Data Corruption Blitz" by SMURF::BAT (Segui la tua beatitudine) Fri Apr 25 1997 01:51

Date: Tue, 22 Apr 1997 17:47:44 -0400 (EDT)
From: John Donovan USG <donovan@zk3.dec.com>
To: "blitz.dis" <boren@bss.enet.dec.com>, comstock@helix.enet.dec.com,
        csc-contacts@guru.zk3.dec.com, DAVE.SPILLANE@REO.mts.dec.com,
        Dianna Ellis UNIX Presales <dianna@zk3.dec.com>,
        dominic@neasys.enet.dec.com, keilty@rhett.ENET.dec.com,
        kenyon@asimov.enet.dec.com, lemire@mse1.enet.dec.com,
        Allan Malcolm USG <malcolm@zk3.dec.com>, martin@decatl.enet.dec.com,
        mgreenfield@hydra.enet.dec.com, Neil Davies <ndavies@zk3.dec.com>,
        USEG Problem Management -- Brian Axtell <axtell@zk3.dec.com>,
        Henry Bone <bone@zk3.dec.com>, Ronald Uberti <uberti@zk3.dec.com>,
        Tom Hayden <hayden@zk3.dec.com>, rmt@zk3.dec.com,
        rutschow@csc32.enet.dec.com, safford@mse1.enet.dec.com,
        strauss@gidday.enet.dec.com, tasar@amcucs.enet.dec.com,
        TECH_INFO@CSSE.enet.dec.com, TIMA_MGR@tima.ENET.dec.com,
        useg@kamlia.zk3.dec.com, usg@kamlia.zk3.dec.com
Cc: John Donovan <donovan@zk3.dec.com>
Subject: KZPSA Data Corruption
Message-Id: <Pine.OSF.3.95.970422174432.9901M-100000@kamlia.zk3.dec.com>
Mime-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII



+---------------------------+TM
|   |   |   |   |   |   |   |
| d | i | g | i | t | a | l |      TIME   DEPENDENT   BLITZ
|   |   |   |   |   |   |   |      
+---------------------------+

 
      BLITZ TITLE: KZPSA Data Corruption         
                                                DATE:23 April 1997
      AUTHOR: John Donovan 			TD #:
      DTN:   381-1344
      ENET:  KAMLIA::DONOVAN			CROSS REFERENCE #'s:
      DEPARTMENT: USEG                           (PRISM/TIME/CLD#'s)  

      INTENDED AUDIENCE:                        PRIORITY LEVEL: 1
      (U.S./EUROPE/GIA)                         (1=TIME CRITICAL,
                                                 2=NON-TIME CRITICAL)
      =====================================================================

      PROBLEM:

      Disk data corruption can occur very intermittently under conditions
      of heavy I/O on a scsi device attached to a KZPSA SCSI Adapter.  This
      happens when a read or a write request to a disk inadvertently gets
      routed to some other disk attached to the same KZPSA.
   
      RESOLUTION/WORKAROUND:
       
      The official change is going into the pools now.  Until the official
      patch is available, there is a test patch available for the following
      releases:

	v3.2c, v3.2de-1, v3.2de-2, v3.2f, v3.2g, v4.0, v4.0a, v4.0b

      in:

	guru:/usr/guest/misc/osf/simport/*.tar

      ADDITIONAL COMMENTS:

      This simport patch MUST be installed on every system containing a
      KZPSA in order to prevent corruption of user data being written to
      or read from disk.

                     *** DIGITAL INTERNAL USE ONLY ***
    
\\ GRP=TIME_DEPENDENT CAT=HARDWARE DB=CSSE_TIME_CRITICAL
\\ TYPE=KNOWN_PROBLEM TYPE=BLITZ STATUS=CURRENT
T.RTitleUserPersonal
Name		DateLines
491.1just fyiSMURF::BATSegui la tua beatitudineFri Apr 25 1997 01:523
    If any customer reports this problem, we'll port the base OSF fixes to
    MLS+ and make available.  Else this will be held until the next patch
    kit release.
491.2Reactive only?RDGENG::SPILLANEDFri Apr 25 1997 12:268
    
    The Digital UNIX blitz states that the patch *must* be installed
    on all systems with KZPSA. Is the assessment such that it is
    acceptable that data corruption occurs prior to the fix being
    applied to MLS+ ?
    Customer's who have Digital UNIX and MLS+ and see the blitz
    message may ask the same question.
491.3But it needn't be installed on systems w/out KZPSASMURF::BATSegui la tua beatitudineFri Apr 25 1997 16:445
    No.  My assessment was:  if you have KZPSA, say so, we'll build
    it and send it out.  I have no idea what people have and do not have,
    and wasn't going to take the time to build something no one wanted.
    I'm sorry I'm so hardware naive, are you telling me that everyone has
    this?
491.4COMICS::CORNEJWhat's an Architect?Mon Apr 28 1997 08:377
    DOVER uses KZPSAs on V3.1a.  any idea as to when the fix will be
    available?
    
    Cheers,
    
    Jc
491.5then I'll let you know if it takes more than 2 shakesSMURF::BATSegui la tua beatitudineMon Apr 28 1997 22:212
    No, but I'll start on it now (or when the last interruption is popped
    off the stack).
491.6COMICS::CORNEJWhat's an Architect?Fri May 09 1997 09:336
    Your 2 shakes are up :-)
    
    Seriously,  any news?
    
    Jc
491.7Sitting in my out boxSMURF::BATSegui la tua beatitudineMon May 12 1997 15:543
    Yes, I have a patch backport, but I haven't had any time to test it.
    I hope to do so today and will let you know ASAP.
491.8and I've done a submit request: 6260 once reviewedSMURF::BATSegui la tua beatitudineTue May 13 1997 00:407
    There is a test patch available in:
    
    ftp psycho.zk3.dec.com
    anonymous
    cd pub/simport
    get simport.o
    get README