Change Settings window

Use this window in the pair creation wizard to change options that affect how the pair is created.

Item

Description

Base Secondary Volume

Selections for the initial S-VOL.

TC, UR and GAD only.

  • Port ID: Port identifier.
  • Host Group ID/iSCSI Target ID: Host group identifier or iSCSI target identifier.
  • LUN ID: LUN identifier.
  • Interval: The interval for allocating S-VOLs to P-VOLs.
  • LDKC: "00" is displayed, cannot be changed.
  • CU: For TC-MF: the CU number of the volume.

    For UR-MF: the CU number of the remote system, ranging from 00 to FF.

  • LDEV: LDEV number, ranging from 00 to FF.

Primary Volume Fence Level

TC or TC-MF only

Whether the P-VOL can be written to when the pair is split due to error.

  • Data: The P-VOL cannot be written to.
  • Status: The P-VOL can be written to only if the primary system can change S-VOL status to PSUE (TC) or Suspend (TC-MF). If the primary system cannot change S-VOL status, the P-VOL cannot be written to.
  • Never: The P-VOL can be written to.

Initial Copy Type

Whether data is copied to the S-VOL when the pair is created.

  • Entire Volume: Data is copied. The default.
  • None: Data is not copied. If you choose this option, you must confirm the data be equal between the P-VOL and S-VOL.
  • Delta: Data is not copied. UR or UR-MF only.

    For UR: The status is changed to HOLD or HOLDING as a pair for delta resync.

    For UR-MF: The status is changed to Hold or Holding as a pair for delta resync.

Copy Pace

Number of tracks to be copied per remote I/O during the operation. The default is 15. The range is different depending on the volume emulation type.

  • OPEN-V (TC and GAD): The range is 1 to 4.
    • 1 is slow. This setting limits the impact on host I/O to maintain storage system performance.
    • 2 and 3 is medium.
    • 4 is fast. This setting increases the impact on host I/O and might result in decreased storage system performance.

    If you enter a number from 5 to 15, the speed of 4 (fast copy pace) is used.

  • Other than OPEN-V (TC): The range is 1 to 15.
    • 1 to 5 are a slow copy pace, and are used to reduce impact on host I/O.
    • 6 to 10 are a medium copy pace.
    • 11 to 15 are a fast copy pace, and the host I/O performance might be degraded.
  • TrueCopy for Mainframe: You can specify 3 or 15 from the list.
    • 3 is slow. This setting limits the impact on host I/O to maintain storage system performance.
    • 15 is fast. This setting increases the impact on host I/O and might result in decreased storage system performance.
  • (TC and GAD) The range is 1 to 4.
    • 1 is slow.

      This setting limits the impact on host I/O to maintain storage system performance.

    • 2 and 3 is medium.
    • 4 is fast.

      This setting increases the impact on host I/O and might result in decreased storage system performance.

    If you enter a number from 5 to 15, the speed of 4 (fast copy pace) is used.

ALUA Mode

GAD only. Whether ALUA Mode is enabled:

  • Enabled: The LDEV is used in ALUA mode.
  • Disabled: The LDEV is not used in ALUA mode.

Initial Copy Priority

Scheduling order for the initial copy operation: range = 1 to 256, default = 32. Not displayed for GAD.

Error Level

UR and UR-MF only.

Whether to split all pairs in the mirror if a failure occurs during this operation:

  • LU: Only the failed pair is split. UR only.
  • Mirror: Pairs in the mirror are split.
  • Volume: Only the failed pair is split.
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