IBM TS7700 Series, Руководство пользователя

Страница: 29 / 117

August 15, 2017
© Copyright IBM Corporation, 2017 Page 29 of 117
•
Do not run host jobs that mount and write data to logical volumes which are being copy exported. If
the host job mounts and writes data to logical volumes being exported while TS7700’s database
backup is being written to the physical volumes, the logical volumes get exposed and are only in
cache.
The status file generated later does not contain the logical volumes as they are no longer active
logical volumes on the exported physical volume. But the logical volumes are marked as active in
the database backup as the backup was created before the logical volumes were exposed.
Inconsistency of the copy exported logical volumes occurs between the status file and the database
backup written to the physical volumes.
•
The physical volume is then moved to the “Export-Hold” category, or if the EJECT option is
specified in the OPTION1 record, to the eject category in the library manager associated with the
TS7700 processing the export.
Note: Prior to code level 8.4.1.57, if the EJECT option was specified and at the time the physical
volume was moved to the eject category the I/O station was full; the physical volume’s state is
moved back to READ-WRITE even though the volume will be ejected when the I/O station has
room. At code level 8.4.1.57, this is changed so that the volume maintains the copy export state and
is instead moved to the Export-Hold category. At code level 8.5.0.xx, the volume remains in the
eject category and is moved to the I/O station when space is available.
•
In addition to the status file records for the logical volumes that have been exported, an additional group
of status file records are written that provides information on all of the physical volumes in the TS7700
that have a state of copy-exported (so they include physical volumes exported during this specific export
operation as well as previous ones). The information includes the current percentage of active data on
each physical volume. The percentage of active data is based on the current information from the
TS7700 database, not the amount when the physical volume was previously exported. This information
may be used to determine when an exported physical volume should be returned to the source TS7700
because it has no active data on it. See the section on
Checking the Status of Copy Exported Physical
Volumes .
•
All hosts attached to the TS7700 (or Grid) are notified that the export operation has completed. A
console message is generated that includes the overall completion status of the export operation and
metrics about the execution of the operation. Refer to the
Export Completion Messages section.