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System Option
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Displays the
system options. The number next to each item is the system
option number.
Values:
- Swap & Freeze (1)
- Quick Restores and then saves the current data. Used
with the Quick Restore, inhibits the Update Copy
operation after performing Quick Restore, and the paired
S-VOL in "PAIR" status is not updated.
- Host I/O Performance (2)
- Use this option to give weight to I/O response rather
than the copy time. This option controls copy operations
and improves the host I/O response.
- HOST I/O priority mode (9 to 13)
- Use this option for the host I/O that causes copy
processing for SI pairs to make the copy
processing for SI 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.
- Nondisruptive Migration Data Consistency
(16)
- Use this option to keep the latest data in the migration
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.
- Copy Pace Ext. Slower1 (20), Copy Pace Ext. Slower2
(21), Copy Pace Ext. None (22)
- Reducing the copy volume in "PAIR" status curbs the
influence to the I/O performance of the host server.
This item is available to all pairs in "PAIR" status.
The order of Copy
Pace Ext. Slower1, Copy
Pace Ext. Slower2, and Copy
Pace Ext. None determines the host
server’s I/O performance.
- Quick/Steady Split Multiplexing (ShadowImage/ShadowImage for Mainframe)
(24)
- Accelerates ShadowImage pair split. The
multiplicity (the number of jobs for which copy
processing can be executed concurrently) of copy
processing for each pair is changed from 1 to 24.
- Reverse Copy Multiplexing (ShadowImage/ShadowImage for Mainframe)
(25)
- Accelerates resynchronization (secondary to primary) of
ShadowImage pairs. The multiplicity (the
number of jobs for which copy processing can be executed
concurrently) of copy processing for each pair is
changed from 1 to 24.
- Normal Resync Multiplexing (ShadowImage/ShadowImage for Mainframe)
(26)
- Accelerates resynchronization (primary to secondary) of
ShadowImage pairs. The multiplicity (the
number of jobs for which copy processing can be executed
concurrently) of copy processing for each pair is
changed from 1 to 24.
- Disable the alert notification of shared memory space
warning (30)
- Inhibits the alert notification of SIM reference 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.
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Status
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Shows whether the system option is currently enabled or disabled.
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Enable button
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Click to enable the selected option.
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Disable button
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Click to disable the selected option.
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