*OpenVMS] VAXSHAD02_072 VAX V7.2 SHADOWING ECO Summary
TITLE: *OpenVMS] VAXSHAD02_072 VAX V7.2 SHADOWING ECO Summary
Modification Date: 05-DEC-00
Modification Type: Modification: Corrected abstract on ftp site.
Modification Date: 05-DEC-00
Modification Type: Updated Kit Supersedes VAXSHAD01_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. All rights reserved.
PRODUCT: Volume Shadowing
OP/SYS: OpenVMS VAX
SOURCE: Compaq Computer Corporation
ECO INFORMATION:
ECO Kit Name: VAXSHAD02_072
ECO Kits Superseded by This ECO Kit: VAXSHAD01_072
ECO Kit Approximate Size: 702 Blocks
Kit Applies To: OpenVMS VAX 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:
VAXUPDATE01_072
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 Volume Shadowing on OpenVMS VAX V7.2. This kit
addresses the following problems:
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:
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.
All trademarks are the property of their respective owners.
This patch can be found at any of these sites:
Colorado Site
Georgia Site
Files on this server are as follows:
vaxshad02_072.README
vaxshad02_072.CHKSUM
vaxshad02_072.CVRLET_TXT
vaxshad02_072.a-dcx_vaxexe
vaxshad02_072.CVRLET_TXT
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