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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 for each pair is changed from 1 to 24.
- Reverse Copy Multiplexing (ShadowImage/ShadowImage for Mainframe) (25): Accelerates the resynchronization of ShadowImage or ShadowImage for Mainframe pairs. The number of jobs for which copy processing can be executed concurrently for each pair is changed from 1 to 24.
- Normal Resync Multiplexing (ShadowImage/ShadowImage for Mainframe) (26): Accelerates the resynchronization (primary to secondary) of ShadowImage or ShadowImage for Mainframe pairs. The number of jobs for which copy processing can be executed concurrently for each pair is changed from 1 to 24.
- Disable the alert notification of shared memory space warning (30): Inhibits alert notification of SIM code 603000.
For more information about the system options, see
System options.
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