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System Option
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Displays the local replica options. The number next to each option indicates the 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 option
increases I/O performance.
Default
status: Disabled
- HOST I/O priority mode (9 to 13): Use this option
for the host I/O that causes copy processing for SI and
SIz pairs to make the copy processing for
SI and SIz pairs fail so that the host I/O is
prioritized. This function is performed if the write pending
rate does not decrease and the host I/O does not finish
within the time period specified by the option. After the
copy processing fails, all data is copied as the
resynchronization. See
Information to know
before setting wait time.
- 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 unit 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 unit 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.
- Display Progress Rate (17): For Thin Image pairs with the cascade attribute
disabled, the pair synchronization rate displayed on
HDvM - SN (Synchronization Rate
(%) in the View Pair Synchronization
Rate window) or CCI is switched to the progress rate.
However, even if this option is enabled, the synchronization
rate is displayed only when the pair status is COPY, RCPY,
or SMPL(PD). If this option is enabled, the following
information is displayed depending on the pair status:
- If the pair status is COPY, RCPY, or
SMPL(PD), displays the progress rate for each
process.
- If the pair status is PAIR, PSUS, or
PSUE, displays the pair synchronization rate that
the current S-VOL data matches that of the next
generation of the S-VOL. If the S-VOL is the latest
one, the synchronization rate is computed by
comparing the S-VOL with the P-VOL.
- 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.
- Increase Background Copy Performance (ShadowImage/ShadowImage for Mainframe) (31): Increases (from 64 to 126) the maximum multiplicity of asynchronous copy processing run in the background when a ShadowImage pair is in the PAIR status.
For more information about these system options, see Local replica options.
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Status
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Shows whether the option is currently enabled or disabled.
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Enable button
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Click to enable the option.
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Disable button
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Click to disable the option.
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