Change Settings window

TrueCopy® User Guide
Version
9.8.5
Audience
anonymous
Part Number
MK-98RD9022-16

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.

(VSP 5000 series) TCz and URz only.

  • LDKC: "00" is displayed, cannot be changed.
  • CU: For TCz: the CU number of the volume.

    For URz: 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 TCz 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 (TCz). 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 URz only.

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

    For URz: 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.

  • (VSP 5000 series) 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.

  • (VSP 5000 series) 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.
  • (VSP 5000 series) 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.
  • (VSP G/F350, G/F370, G/F700, G/F900, VSP E series) (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.

CFW Data (VSP 5000 series)

TCz only.

Whether CFW (DASD fast write) data is copied to the S-VOL.

  • Primary Volume Only: Data not copied (default).
  • Secondary Volume Copy: Data is copied.

Note:

  • To apply the pair option that is set on the P-VOL to the S-VOL, split and then resynchronize the TCz pair.
  • Do not specify Primary Volume Only if system option mode (SOM) 1091 is ON. If you do, I/O to the S-VOL might terminate abnormally.
  • Do not set SOM 1091 to ON if you changed the CFW data setting after you created the TCz pair. If you do, I/O to the S-VOL might terminate abnormally.

DFW to Secondary Volume (VSP 5000 series)

TCz only.

Whether the primary system splits the pair when the secondary system cannot copy DFW data to the S-VOL

  • Require: Splits the pair.
  • Not Require: Does not split.

Some combinations of the DFW setting and the primary volume fence level setting might cause an eternal I/O error in a host application when the P-VOL is updated. Track pairs for which DFW is set to Require to make sure that this item is not blocked.

IBM PPRC commands do not support this item. If you use the CESTPAIR TSO command to create a TCz pair, this item is set to Not Require.

Host I/O Time Stamp Transfer (VSP 5000 series)

TCz only.

  • Enable: The host I/O time stamp is transferred from P-VOL to S-VOL (default).
  • Disable: The host I/O time stamp is not transferred from P-VOL to S-VOL.

Whether the host I/O time stamp is transferred from P-VOL to S-VOL.

Error Level

UR and URz 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.
  • (VSP 5000 series) Volume: Only the failed pair is split.

CFW (VSP 5000 series)

URz only.

Whether to copy cache fast write (CFW) data to the S-VOL.

  • Primary Volume Only: Does not copy. Default.
  • Secondary Volume Copy: Copies.