HP XP7 Continuous Access Synchronous for Mainframe Systems User Guide (TK911-96003)

Virtual LVI
Virtual LVI volumes can be assigned to Cnt Ac-S Z pairs, with the following restrictions:
• The S-VOL must have the same capacity as the P-VOL.
• When performing Virtual LVI operations on an existing Cnt Ac-S Z P-VOL or S-VOL, you must
release the pair first to return the volume to Simplex status.
For more information, see thehe HP XP7 Provisioning for Mainframe Systems User Guide.
Auto LUN
The following table shows when Cnt Ac-S Z volumes may be used as Auto LUN volumes.
Used as Auto LUN volume?Volume/pair status
NoP-VOL/S-VOL in Pending status
YesP-VOL/S-VOL in Duplex status
YesP-VOL/S-VOL in Suspend status
Restrictions
The following restrictions must be followed when a Cnt Ac-S Z volume in Duplex status is used as
a Auto LUN volume:
• Set I/O rates less than 50 IOPS while migrating volumes; if more than 50 IOPS, volumes may
not be migrated.
• If a data path failure occurs, remove the failure then migrate the volume.
• If an external volume or a THP V-VOL is used, information from before the volume is migrated
displays in the secondary system Remote Web Console window. If the Auto LUN is completed
and the Cnt Ac-S Z pair is suspended and resynchronized, the volume’s information is updated.
• Do not migrate P-VOL and S-VOL at the same time, or a host I/O timeout will occur.
• Do not change the status of a volume during migration; the status may not change.
Volume Retention
Mainframe Array Management access attributes can be assigned to Continuous Access Synchronous
Z pair volumes. The following table shows how access attributes change.
Note that the Protect attribute cannot be successfully assigned because it causes pair suspension.
S-VOLP-VOL
DisabledEnabledDisabledEnabledDisabledEnabled.VRM
ProtectRead OnlyRead/Write enabledAccess
attribute
Pairs cannot
be created
Pairs cannot
be created
P-VOL
Read/Write
P-VOL/S-VOL
Read/Write
enabled
P-VOL/S-VOL
Read/Write
enabled
P-VOL/S-VOL
Read/Write
enabled
Read/Write
enabled
Enabled
enabled,
S-VOL Read
only
Pairs cannot
be created
Pairs cannot
be created
P-VOL
Read/Write
P-VOL
Read/Write
P-VOL/S-VOL
Read/Write
enabled
P-VOL/S-VOL
Read/Write
enabled
Disabled
enabled,enabled,
S-VOL Read
only
S-VOL Read
only
Virtual LVI 57