Updated: 11 December 1998

Volume Shadowing for OpenVMS

Shadowing operations can display the following status messages on the system console (OPA0) and on terminals enabled to receive disk operator messages.

Shadowing messages always include the prefix %SHADOW-I-VOLPROC and can sometimes be followed by "Volume Processing in Progress." The messages are displayed in the following format:

%SHADOW-I-VOLPROC, message-text

• The %SHADOW prefix indicates that the shadowing software is the facility that produced the error.
• I is a one-letter code indicating the status or the severity of the error. The VOLPROC messages are always informational (I) errors.
• VOLPROC is an abbreviation for the volume-processing facility.
• The variable message-text is the description of the status message. For most volume-processing errors, the text includes the virtual unit number or member unit number of the disk or device causing the error.

The following example shows a complete volume-processing status message:

%SHADOW-I-VOLPROC, DSA13: shadow set has changed state. Volume processing in progress.

The following messages are returned by the VOLPROC in response to shadow set operations. The messages in this section are listed in alphabetical order beginning with the first word after the shadow set member name or the virtual unit name. For simplicity, the messages do not include the %SHADOW-I-VOLPROC prefix.

shadow-set-member: contains the wrong volume.
Explanation: The shadowing software discovered a volume label mismatch after failover.
User Action: Check the disk drives and unit numbers.

shadow-set-member: has aborted volume processing.
Explanation: The shadow set is dissolved. A shadow set member was not restored to operational status before the MVTIMEOUT system parameter setting expires; thus, the mount operation aborts for the shadow set.
User Action: Check error logs and the shadow set membership; the disk or controller might need repair.

shadow-set-member: has been write-locked.
Explanation: The data on the disk is protected against write I/O operations.
User Action: Remove the write lock on the volume.

shadow-set-member: has completed volume processing.
Explanation: The shadow set state change is complete.
User Action: Check the shadow set membership; the disk or controller might need repair.

shadow-set-member: is offline.
Explanation: A shadow set member is off line. The shadowing software attempts to fail over.
User Action: None.

shadow-set-member: shadow copy has been completed.
Explanation: A shadow copy operation has completed.
User Action: None.

shadow-set-member: shadow set has been reduced.
Explanation: The specified shadow set member has been removed.
User Action: If the member failed out of the set (not dismounted), look for the cause of the failure and repair it.

virtual-unit: all shadow set copy operations are completed.
Explanation: All pending shadow set copy operations have completed. The same logical block on any shadow set member contains the same data.
User Action: None.

virtual-unit: shadow copy has been started.
Explanation: Indicates the start of a shadow copy operation.
User Action: None.

virtual-unit: shadow master has changed. Dump file will be written if system crashes. Volume Processing in progress.
Explanation: The shadowing software has determined a new master disk for the system disk shadow set. You can write a dump file for this system only if the master is the same disk as the one the system booted from. This is because the boot drivers are not connected with the shadow driver, and different boot drivers from the ones that interact with the booted system disk might be needed to interact with the new master disk. For example, a system disk could be served and also locally connected, causing the served path to use different drivers from the local path.
User Action: None.

virtual-unit: shadow master has changed. Dump file will not be written if the system crashes. Volume processing in progress.
Explanation: Indicates that the disk from which you booted is no longer in the shadow set. If a system failure occurs, a dump file cannot be written to the removed disk.
User Action: Return the disk to the shadow set.

virtual-unit: shadow set has changed state. Volume processing in progress.
Explanation: The state of the shadow set is in transition. The membership of the shadow set is changing because of either the addition or removal of members from the shadow set, or failover to another device after a hardware error. Further messages give details if a change occurs.
User Action: None.

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