Use the View/Modify Properties notebook to view or modify properties
for IBM® DS8000® Metro Global
Mirror with Practice sessions.
The properties are displayed on different tabs in the
notebook. Use the Session Options tab to set
properties that apply to the entire session. Use the individual role
pair option tabs to set properties that apply to specific role pairs.
For example, properties for the H1-H2 role pair are contained in the H1-H2
Options tab.
- Session Options
- Enter the properties for the session.
- Description
- Type the description for this session.
- Reset Secondary Reserves
- Select this option to remove any persistent reserves that might
be set on the target volumes of the copy sets when a Start command
is issued for the session.
Attention: This option causes
the session to overwrite all data that is on the target volume.
- Fail MM/GC if target is online (CKD only)
- Select this option to fail any session commands for a Metro Mirror
or Global Copy relationship if the target volume is in the Online
state. For more information about this state, refer to the documentation
for the storage system.
- This option applies only to count key data (CKD) volumes.
- H1-H2 Options
- Enter the properties for the role pair.
- Metro Mirror Suspend Policy
- Select one of the following options to specify the policy for
holding or releasing input/output (I/O) after a Metro Mirror relationship
is suspended. When a relationship is in a Suspended state, write operations
from the source volume are no longer mirrored to the target volume.
- Hold I/O after Suspend
- Click this option to prevent the source volume from receiving
new data after the relationship is suspended. Use this option if you
want to determine the scope of the suspension before new data is written
to the source volume. This option helps to ensure that the data on
the source and target volumes remains the same.
- To enable write operations to the source volume to continue, issue
the Copy Services Manager Release
I/O command for the session. If you do not issue this command,
write operations are enabled when the hardware timeout value on the
storage system expires.
- Release I/O after Suspend
- Click this option to enable the source volume to automatically
receive data after the relationship is suspended. Use this option
if you want to limit the effect on the applications that are writing
to the source volume. This option is enabled by default.
Attention: This option can cause the data on the source volume
to be different from the data on target volume.
- z/OS Management
- Select the following options to manage IBM z/OS® features
for the role pair.
- The z/OS Management options are displayed
only if Copy Services Manager is
installed on or connected to a z/OS host
system. You can add a z/OS host
connections in Copy Services Manager regardless
of the operating system on which the application is installed.
- When you are connected to a z/OS host
system, you can manage z/OS features
for volumes that are attached to the host system. In addition, you
can manage these features for volumes that are attached to other z/OS systems that are connected
to the host system through a sysplex.
- System or sysplex
- Select the z/OS system
or sysplex that you want to associate with the session. Commands for
z/OS features are issued to this system or sysplex. Volumes in the
session must be attached to the system or sysplex to enable the features.
- Enable Hardened Freeze
- Select this option to enable the z/OS Input/Output
Supervisor (IOS) to manage freeze operations.
- Requirement: This option requires the z/OS address spaces Basic HyperSwap® Management
and Basic HyperSwap API.
For instructions about how to start these address spaces, see the
information about preparing to use Basic HyperSwap from z/OS in the IBM Copy
Services Manager Installation and Configuration Guide.
- If you select this option, IOS can freeze volumes regardless of
whether the Copy Services Manager server
is started or stopped.
- In addition, this option enables you to include z/OS system volumes such as paging, database,
and IBM WebSphere® Application Server hierarchical
file system (HFS) as Metro Mirror volumes in the session. When you
select this option, IOS manages the freeze operations for all Metro
Mirror volumes in the session, which prevents Copy Services Manager from
freezing the volumes and possibly freezing itself. This option does
not enable IOS to manage freeze operations for Global Mirror volumes.
- If you select the Manage H1-H2 with HyperSwap option
for the session, this option is ignored. HyperSwap includes IOS for managing freeze
operations. The Enable Hardened Freeze option
ensures data integrity if Copy Services Manager freezes
and HyperSwap are not
enabled for a session.
- Manage H1-H2 with HyperSwap
- Select this option to trigger a HyperSwap operation, which redirects application
I/O to the target volumes when there is a failure on the host accessible
volumes. Copy Services Manager uses HyperSwap to
manage the H1-H2 sequence of a Metro Mirror or Metro Global Mirror
session.
- Disable HyperSwap
- Select this option to prevent a HyperSwap operation from occurring.
- Reset In Use By System on Secondary Volumes
- Select
this option to have the load of the configuration automatically reset the In Use By System state on
all secondary volumes (UCBNALOC = OFF). When this option is not selected, a load of the
configuration fails when secondary volumes are in the In Use By System state (UCBNALOC is ON). This
feature is only available after APAR OA53082 is applied to the z/OS system.
- Unbox Secondary Volumes
- Select
this option to have the load of the configuration automatically unbox all secondary volumes in the
configuration. When this option is not selected, a load of the configuration fails when secondary
volumes are in a boxed state. This feature is only available after APAR OA53082 is applied to the
z/OS system.
- On Configuration Error:
-
- Partition the system(s) out of the sysplex
- Select this option to partition a new system out of the sysplex when an error occurs because the
system cannot be added to the HyperSwap
configuration.
- Disable HyperSwap
- Select this option to prevent a HyperSwap operation
from occurring.
- On Planned HyperSwap Error:
- Partition out the failing system(s) and continue swap
processing on the remaining system(s)
- Select this option to partition out the failing system and continue
the swap processing on any remaining systems.
- Disable HyperSwap after attempting backout
- Select this option to enable IOS to back out the HyperSwap operation, if possible, if an
error occurs during HyperSwap processing. HyperSwap is disabled.
- On Unplanned HyperSwap Error:
- Partition out the failing system(s) and continue swap
processing on the remaining system(s)
- Select this option to partition out the failing systems and continue HyperSwap processing on the
remaining systems when a new system is added to the sysplex and the HyperSwap operation does not
complete.
- Requirement: If you select this option, you must restart
the system.
- Disable HyperSwap after attempting backout
- Select this option to enable IOS to back out the HyperSwap operation, if possible, if an
error occurs during HyperSwap processing. HyperSwap is disabled.
- H1-J3 Options and H2-J3 Options
- Enter the properties for the role pair.
- Consistency group interval time (seconds)
- Type how often, in seconds, the Global Mirror session attempts
to form a consistency group. A lower value possibly reduces the data
exposure of the session. However, a lower value also causes the session
to attempt to create consistency groups more frequently, which can
increase network traffic.
- Max Coordination Interval (milliseconds)
- Type in the maximum amount of time, in milliseconds, for the extended-distance
consistency-coordination interval. The default value for new sessions is 50 milliseconds.
Setting this field to 0 is equivalent to <auto> and indicates to the storage system to use the
default value.
- Max CG Drain Time (seconds)
- Type in the maximum amount of time, in seconds, that the consistent set of data is allowed
to drain at the remote site before failing consistency group formation. The default value for
new sessions is 90 seconds. Setting this field to 0 is equivalent to <auto> and indicates
to the storage system to use the default value.
- Recovery Point Objective Alerts
- Specify the length of time that you want to set for the recovery
point objective (RPO) thresholds. The values determine whether a Warning
or Severe alert is generated when the RPO threshold is exceeded for
a role pair. The RPO represents the length of time in seconds of data
exposure that is acceptable if a disaster occurs.
- Use the following options to set the RPO threshold values. For
both options, you can specify an RPO threshold in the range of 0 -
65535 seconds. The default is 0 seconds, which specifies that no alerts
are generated.
- Warning level threshold (seconds)
- Type the number of seconds that you want to set for the warning
level RPO threshold. If the RPO is greater than this value, an alert
is generated.
- If the value in this field is other than 0, it must be greater
than the value in the Consistency group interval time (seconds) field
and less than the value in the Severe level threshold (seconds) field.
- Severe level threshold (seconds)
- Type the number of seconds that you want to set for the severe
level RPO threshold. If the RPO is greater than this value, an alert
is generated and the session status changes to Severe.
- If the value in this field is other than 0, it must be greater
than the value in the Warning level threshold (seconds) field.
- H3-I3 Options
- Enter the properties for the role pair.
- No Copy
- Select this option if you do not want the hardware to write the
background copy until the source track is written to. Data is not
copied to the H3 volume until the blocks or tracks of the I3 volume
are modified.
- This option is available only for IBM
DS8000 version
4.2 or later.
- Incremental
- Select this option to apply incremental changes to the target volume. After the initial
FlashCopy operation, only data that changed on the source volume since the last FlashCopy operation
completed is copied to the target volume. This option is only valid if the source storage system
supports multiple incremental FlashCopy. If you select this option, a persistent FlashCopy
relationship is created.
- Reset target reserves (FB only)
- Select this option to reset the SCSI reserves on the FlashCopy target volumes.
- This option applies only to fixed block (FB) volumes.
Note: The SCSI reserves are reset only
when the Flash command is issued, after the Reset target reserves
(FB only) option is selected.
- Journal Options
- Reflash After Recover
Select this option to reflash a consistent set of data to the journal
volume after a Recover command is issued to the session. Reflashing to the journal volume ensures
that there is a consistent copy of the data to recover from if failures occur during
resynchronization. If you do not select this option, the journal volumes will not have a consistent
copy of the data after the recover operation. However, the space will be available when
space-efficient volumes are used.