Edit Local Replica Options window

Use this window to specify options that affect host server I/O performance. This is the first window of the Edit Local Replica Options wizard.

For more information, see the topic on system options that affect performance by selecting In-System Replication to navigate to the desired software and information.

Setting fields (VSP G1000, G1500, and VSP F1500)

The following table describes the setting fields for this window.

Item

Description

System Type

The system type.

Values:

  • Open: SI or HTI

  • Mainframe: SIz, FCv2, or FCSE

System Options table

The following table describes the items in this table.

Item

Description

System Option

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 to one half, thereby improving host I/O response.

  • (FCv2, SIz, and FCSE only) FC Slower Copy2 (4): Reduces background copying to one quarter, thereby improving host I/O response.

  • (FCv2, SIz, and FCSE only) FC Ext. Slower Copy1 (17): When the MP operating ratio of the MP blade or unit to which the source volume or target volume in a Compatible FlashCopy® V2 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 blade or unit to which the source volume or target volume in a Compatible FlashCopy® V2 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.

  • Non-disruptive 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.

  • (VSP G1000, G1500, and VSP F1500) ShadowImage/ShadowImage for Mainframe

  • Quick/Steady Split Multiplexing (24): Accelerates the resynchronization of ShadowImage pair split. 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 (25): Accelerates the resynchronization of ShadowImage pair split. The number of jobs for which copy processing can be executed concurrently of copy processing for each pair is changed from 1 to 24.

For more information about the system options, see the topic on setting system options by selecting In-System Replication to navigate to the desired software and information.

Status

Shows whether the option is currently enabled or disabled.

Enable button

Click to enable the option.

Disable button

Click to disable the option.