OpenVMS VMS72_F11X-V0200 Alpha V7.2 F11BXQP ECO Summary

TITLE: OpenVMS VMS72_F11X-V0200 Alpha V7.2 F11BXQP ECO Summary
 
Modification Date:  07-OCT-1999
Modification Type:  Updated Kit:  Supersedes VMS72_F11X-V0100 

NOTE:  An OpenVMS saveset or PCSI installation file is stored
       on the Internet in a self-expanding compressed file.
       The name of the compressed file will be kit_name-dcx_vaxexe
       for OpenVMS VAX or kit_name-dcx_axpexe for OpenVMS Alpha.
 
       Once the file is copied to your system, it can be expanded
       by typing RUN compressed_file.  The resultant file will
       be the OpenVMS saveset or PCSI installation file which
       can be used to install the ECO.
 
Copyright (c) Compaq Computer Corporation 1999.  All rights reserved.

OP/SYS:     OpenVMS Alpha 

COMPONENT:  F11BXQP 

SOURCE:     Compaq Computer Corporation

ECO INFORMATION:

     ECO Kit Name:  VMS72_F11X-V0200
                    DEC-AXPVMS-VMS72_F11X-V0200--4.PCSI
     ECO Kits Superseded by This ECO Kit:  VMS72_F11X-V0100
                    DEC-AXPVMS-VMS72_F11X-V0100--4.PCSI
     ECO Kit Approximate Size:  896 Blocks
     Kit Applies To:  OpenVMS Alpha V7.2
     System/Cluster Reboot Necessary:  Yes
     Rolling Re-boot Supported:  Yes
     Installation Rating:  INSTALL_1
                           1 - To be installed on all systems running
                               the listed version(s) of OpenVMS.

     Kit Dependencies:

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

         VMS72_HARDWARE-V0100 Or VMS72_UPDATE-V0100

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

         None 


ECO KIT SUMMARY:

An ECO kit exists for the F11BXQP on OpenVMS Alpha V7.2.  This kit 
addresses the following problems: 

Problems Addressed in VMS72_F11X-V0200:

  o  Since the VMS72_F11X-V0100 kit only checks to see if the
     VMS72_UPDATE-V0100 kit has been installed, the installation
     fails if only the VMS72_HARDWARE-V0100 kit is installed.  Since
     the VMS72_HARDWARE-V0100 kit includes the VMS72_UPDATE-V0100 kit, 
     the installation should also check to see if the 
     VMS72_HARDWARE-V0100 kit is installed and continue the installation 
     if it has been.

     This kit corrects this problem by checking for both the
     VMS72_UPDATE-V0100 and VMS72_HARDWARE-V0100 kits.

     There are no functional changes in this kit.  If you have
     installed the VMS72_F11X-V0100 kit, you do not need to install
     this kit.


Problems Addressed in VMS72_F11X-V0100:

  o  An XQPERR bugcheck in LOCKERS can occur when the retry limit
     on the F11B$x lock is reached.

     This problem can occur when the owner of the $x lock is
     running at a high process process priority and a number of
     processes that are in a clustered system are also trying to
     validate this lock, but at a lower process priority.

     Image(s) Affected  -  [SYS$LDR]F11BXQP.EXE

  o  After releasing the current process's IPL/Fork lock, a
     system can crash with an SPLACQERR bugcheck

     Image(s) Affected  -  [SYS$LDR]F11BXQP.EXE

  o  A directory file becomes "corrupt" and DUMP/DIRECTORY
     displays a block similar to the following:

       Virtual block number 3574 (00000DF6), 512 (0200) bytes
       0000  Directory Entry:
       0000    Size:             508

       0002    Version limit:    32767
       0004    Type:             0  (FID)
       0005    Name count:       24
       0006    Name:             COSLR1201_01_JUPICC2.LIS
       001E    Version:  7859    FID:  (40993,5,0)
       0026    Version:  7858    FID:  (40990,1,0)
       002E    Version:  7857    FID:  (40988,3,0)
       ...
       01E6    Version:  7802    FID:  (40455,1,0)
       01EE    Version:  7801    FID:  (40454,1,0)
       01F6    Version: 32767    FID:  (16744447,65535,0)
       01FE  End of records (-1)

     The directory shuffle code creates the above erroneous
     directory entry for the following reasons:

       1.  So that a new directory buffer will have a valid
           structure (this allows VALIDATE_DIRBLK to write
           the block to disk); and

       2.  The entry will be spotted as incorrect (via VERIFY)
           if the system crashes in the middle of this shuffle.

     After the directory block (with the erroneous directory entry)
     is written to disk, the bad entry is removed.  A subsequent
     call to READ_BLOCK assumes that the block comes from the
     buffer cache and not from disk.  Under heavy load, this
     assumption may not be true as the directory block may have
     been kicked out of the cache.

     Image(s) Affected  -  [SYS$LDR]F11BXQP.EXE

  o  XQP DELETE code accepts an FCB (File Control Block) off the
     limbo queue if not IO$V_DELETE.  This prevents the
     invalidation of VIOC cache blocks as the result of a RENAME
     operation.   This causes a large amount of XQP (FCB) and VIOC
     (CFCB) non-paged pool usage as well as XQPERR bugchecks.

     Image(s) Affected - [SYS$LDR]F11BXQP.EXE

  o  Under the following circumstances,

       1.  A directory with multiple headers (e.g., from a large ACL)
           is deleted on one node (A) in a cluster; and

       2.  the directory had been previously accessed on another node
           (B) in the cluster,

     The files created with the previously deleted headers in step
     1 would show up on node B with the error:

       %SYSTEM-F-NOSUCHFILE, no such file.

     Image(s) Affected  -  [SYS$LDR]F11BXQP.EXE


INSTALLATION NOTES:

The images in this kit will not take effect until the system is
rebooted.  If there are other nodes in the VMScluster, 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.
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dec-axpvms-vms72_f11x-v0200--4.README
dec-axpvms-vms72_f11x-v0200--4.CHKSUM
dec-axpvms-vms72_f11x-v0200--4.pcsi-dcx_axpexe
vms72_f11x-v0200.CVRLET_TXT