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* This is a newly released patch... *
* *
* Online links can be found at *
* http://ftp.support.compaq.com/patches/public/vms/vax/v7.2/vaxshad03_072.README
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TITLE: OpenVMS VAXSHAD03_072 VAX V7.2 SHADOWING ECO Summary

New Kit Date: 28-NOV-2001
Modification Date: Not Applicable
Modification Type: Updated Kit Supersedes VAXSHAD02_072
 
NOTE: An OpenVMS saveset or PCSI installation file is stored
       on the Internet in a self-expanding compressed file.
 
       For OpenVMS savesets, the name of the compressed saveset
       file will be kit_name.a-dcx_vaxexe for OpenVMS VAX or
       kit_name.a-dcx_axpexe for OpenVMS Alpha. Once the OpenVMS
       saveset is copied to your system, expand the compressed
       saveset by typing RUN kitname.dcx_vaxexe or kitname.dcx_alpexe.
 
       For PCSI files, once the PCSI file is copied to your system,
       rename the PCSI file to kitname-dcx_axpexe.pcsi, then it can
       be expanded by typing RUN kitname-dcx_axpexe.pcsi. The resultant
       file will be the PCSI installation file which can be used to install
       the ECO.
 

Copyright (c) Compaq Computer Corporation 2000, 2001. All rights reserved.

PRODUCT: Volume Shadowing

OP/SYS: OpenVMS VAX

SOURCE: Compaq Computer Corporation

ECO INFORMATION:

     ECO Kit Name: VAXSHAD03_072
     ECO Kits Superseded by This ECO Kit: VAXSHAD02_072
     ECO Kit Approximate Size: 756 Blocks
     Kit Applies To: OpenVMS VAX V7.2
     System/Cluster Reboot Necessary: Yes
     Rolling Re-boot Supported: Yes
     Installation Rating: INSTALL_2
                           2 - To be installed by all customers
                               using the following feature(s):

                                SHADOWING.

     Kit Dependencies:

       The following remedial kit(s), or later, must be installed BEFORE
       installation of this kit:

         VAXUPDATE02_072

       In order to receive all the corrections listed in this
       kit, the following remedial kits, or later, should also be installed:

         None

ECO KIT SUMMARY:

An ECO kit exists for Volume Shadowing on OpenVMS VAX V7.2. This kit
addresses the following problems:

ROBLEMS ADDRESSED IN VAXSHAD03_072 KIT:

  o A Host Based Raidset can hang when one member of a shadowset
     encounters an Operation Incomplete error.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o A system can crash with a SHADDETINCON bugcheck at
     SHDRIVER+93CD4

     Crashdump Summary Information:
     ------------------------------
     Bugcheck Type: SHADDETINCON, SHADOWING detects
                        inconsistent state
     Current Process: CTM$_00060006
     Current Image: $1$DGA5014:[CTM$TMROOT.]
                        [CTM_HAMMER]CTM_HAMMER_ALPHA_32.EXE;1
     Failing PC: FFFFFFFF.804A1CD4 SHDRIVER+93CD4
     Failing PS: 14000000.00000804
     Module: SHDRIVER
                        (Link Date/Time: 15-DEC-2000 15:08:57.95)
     Offset: 00093CD4

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o A system crash occurs with SHADDETINCON in SHDRIVER +
     000762A0.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o A system crash can occur with SHADDETINCON in the WATCHER node
     when a master member identifies that an IN_SET lock value
     block is not a member of the set on the WATCHER node.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o Multiple systems can hang on cluster shutdown.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o A system disk MVTIMEOUT is not managed correctly.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o A system crash occurs with SHADDETINCON in EXPEL_DEVICE when
     membership event status cannot be determined in
     end_mbr_change_vp.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o If SYSGEN system check is enabled, the first MOUNT of a system
     disk will crash the system.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o MountVerifcation messages can occur with no apparent cause.
     There is no way to identify what is causing these messages

       Images Affected: [SYS$LDR]SHDRIVER.EXE

Problems Addressed in VAXSHAD02_072:

  o The virtual unit hangs until MVTIMEOUT expires.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o If one of the existing members of the system disk shadow set
     cannot be found, a lock status race condition could occur.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o An INVEXCPETN crash occurs in SHIN$RESTORE_WLE_ENTRY when a
     write completes to a multi-member shadow set.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

 o An "Incompatible shadow set member" (SS$_INCSHAMEM) error
     message is displayed.

        Images Affected: [SYS$LDR]SHDRIVER.EXE

 o A SHADDETICON error displays after removing or adding a
     shadowset member.

        Images Affected: [SYS$LDR]SHDRIVER.EXE

 o If a full merge is pending or in-process on a two member
     shadow set and a third member is then added to the shadow set,
     if there is a difference between the two SRC members and the
     master member is removed from the shadow set, it is possible
     that data may be corrupted.

        Images Affected: [SYS$LDR]SHDRIVER.EXE

 o When a path to a device is lost during a write operation, the
     SCB (system control block) can contain a stale master member
     index value. This will cause the system to crash with a
     SHADDETINCON bugcheck.

        Images Affected: [SYS$LDR]SHDRIVER.EXE

 o A system crash occurs in SHLK$MERGE_SIGNAL on a cluster node
     when another cluster node, holding MRGVAL lock, either crashes
     or is shut down.

        Images Affected: [SYS$LDR]SHDRIVER.EXE

 o Increase the merge factor for shadowing from 1,000 to 10,000.
     This change also displays the merge factor only during an
     actual merge operation.

        Images Affected: [SYSEXE]SHADOW_SERVER.EXE

Problems Addressed in VAXSHAD01_072:

  o The SHADOWSET goes into MOUNTVERIFYTIMEOUT and cannot be
     remounted. The process attempting the mount hangs.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o After entering an incorrect command involving a shadowset, the
     system crashes with SHADDETINCON.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o Disabling a FibreChannel cascade connection results in a
     system crash.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o Disabling a FibreChannel cascade connection corrupts a
     shadowset member. When the cascade connection is broken, two
     nodes can only see their local FC device. They enter
     Mountverifaction. One node will throw out its remote member
     and continue using the last member. The other node will then
     throw out its remote member, i.e., the disk that has just been
     used by the first node. This causes the first node to have
     zero members and the second node continues with a member that
     did not get the last set of writes.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o Bit 16 in SHADOW_SYS_DISK can be set by the user to eliminate
     using remote members of the shadowset for reads. Occasionally,
     use of bit 16 fails to eliminate remote members from being used.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o A CPUSPINWAIT bug check can occur if the read of the SCB of
     a shadow set member cannot pass the checksum test.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o DCD (Disk Copy Data) will not always be initiated properly.
     During an assisted operation, if the source member was
     dismounted or otherwise removed from the shadow set, the
     connection to the controller would not clean up correctly.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o A full copy operation that is interrupted by a mini merge may
     not be completed correctly.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o When a copy operation that interrupts a merge operation is
     terminating, it finds that there are no members marked for the
     merge and the thread crashes the system with a SHADDETINCON
     bug check.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o SHOW DEVICES shows zero percent merged status even though the
     shadow set status does not indicate that a merge is required.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o INCSHAMEM tracing is not enabled.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o Use of bit 16 in SHADOW_SYS_DISK bias reads of the local
     source shadow set member does not always work.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o When all members of the system disk shadowset are configured,
     if the boot device has gone off line, SCB reads fail with dev
     off line errors. This causes the system to crash with
     SHADBOOTFAIL.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o When one or more shadowset members is in a copy state, the
     system may with an INVEXCPTN bugcheck.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o System crash in XQP when an IO gets a SS$_DATACHECK during a
     Shadowset copy operation.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

  o System can crash with a SHADDETINCON bugcheck.

       Images Affected: [SYS$LDR]SHDRIVER.EXE

INSTALLATION NOTES:

This kit requires a system reboot. Compaq strongly recommends that
a reboot is performed immediately after kit installation to avoid
system instability

If you have other nodes in your OpenVMS cluster, they must also be
rebooted in order to make use of the new image(s). If it is not
possible or convenient to reboot the entire cluster at this time, a
rolling re-boot may be performed.

INSTALLATION INSTRUCTIONS:

Install this kit with the {Installation Utility} utility by logging
into the SYSTEM account, and typing the following at the DCL
prompt:

     SYS$UPDATE:VMSINSTAL VAXSHAD03_072 [location of the saveset]

The saveset location may be a tape drive, CD, or a disk directory
that contains the kit saveset.

All trademarks are the property of their respective owners.

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