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System Option
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Displays the system options. The number next to each system option indicates the system option number.
Values:
- Swap & Freeze (1): Use this option to suppress the storage system's update copy operations. After a Quick Restore and the pair is in DUPLEX status (for
SIz,
FCv2, or FCSE) or PAIR status (for
SI or
HTI), the S-VOL (target volume for
FCv2 or FCSE) remains unchanged, and differential data is not copied to the new S-VOL.
Default status:
Disabled
- HOST I/O Performance (2): Suppresses copy operations at all times, regardless of the workload. This system option increases I/O performance.
Default status:
Disabled
- Copy Pace: Maximizes host server I/O performance by suppressing copy processing only if the pair status is DUPLEX (for
SIz,
FCv2, or FCSE) or PAIR (for
SI or
HTI).
Processing-suppression/performance-improvement levels:
- (FCv2,
SIz, and FCSE only)
FC Slower Copy1 (3): Reduces background copying multiplicity (number of
FCv2 or FCSE relationships for which you can perform background copying concurrently) to one half, which improves host I/O response.
- (FCv2,
SIz, and FCSE only)
FC Slower Copy2 (4): Reduces background copying multiplicity (number of
FCv2 or FCSE relationships for which you can perform background copying concurrently) to one quarter, which improves host I/O response.
- (FCv2,
SIz, and FCSE only)
FC Ext. Slower Copy1 (17): When the MP operating ratio of the MP
to which the source volume or target volume in a
FCv2 or FCSE relationship is allocated exceeds 65%, background copy operations are suppressed, thereby improving the host I/O response.
- (FCv2,
SIz, and FCSE only)
FC Ext. Slower Copy2 (18): When the MP operating ratio of the MP
to which the source volume or target volume in a
FCv2 or FCSE relationship is allocated exceeds 50%, background copy operations are suppressed, thereby improving the host I/O response.
- Copy Pace Ext. Slower1 (20)
Default status:
Disabled
- Copy Pace Ext. Slower2 (21)
Default status:
Disabled
- Copy Pace Ext. None (22)
Default status:
Disabled
The I/O performance of the host server is improved most effectively with Copy Pace Ext. None, followed by Copy Pace Ext. Slower2, and then Copy Pace Ext. Slower1.
- Nondisruptive Migration Data Consistency (16): Use this option to keep the latest data in the source storage system instead of distributing data in both the destination and source storage systems during data migration.
- Quick/Steady Split Multiplexing (ShadowImage/ShadowImage for Mainframe)
(24): Accelerates
ShadowImage or
ShadowImage for Mainframe pair split. The number of jobs for which copy processing can be executed concurrently of copy processing for each pair is from 1 to 24.
- Reverse Copy Multiplexing (ShadowImage/ShadowImage for Mainframe)
(25): Accelerates the resynchronization of
ShadowImage or
ShadowImage for Mainframe pair. The number of jobs for which copy processing can be executed concurrently of copy processing for each pair is from 1 to 24.
For more information about the system options, see
System options.
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