Hitachi G200 User Manual page 89

Caution: In the USP V/VM and VSP models, LUN IDs are displayed as
hexadecimal numbers. In the VSP Gx00 models and VSP Fx00 models,
LUN IDs are displayed as decimal or hexadecimal numbers. If you
have selected the decimal notation, when assigning an S-VOL in a
USP V/VM or VSP storage system, make sure to convert the
hexadecimal LUN ID number to decimal.
b For Selection Type, select the method for assigning S-VOLs when
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multiple primary volumes are selected.
- With Interval, specify an interval the system skips between
secondary system LU numbers.
c - With Relative Primary Volume, the system assigns secondary
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system LU numbers based on proximity to P-VOL LU numbers.
7 Click Options to define the following optional settings:
.
a For Primary Volume Fence Level, specify whether the primary
.
system allows or rejects write operations to the P-VOL when the pair
is split due to an error.
- Data: The P-VOL cannot be written to.
- Status: The P-VOL can be written to if the primary system can
change S-VOL status to PSUE; otherwise it cannot be written to.
- Never: The P-VOL can always be written to.
b For Initial Copy Type, specify whether to copy data from P-VOL to
.
S-VOL during the operation.
- Entire Volume creates the pair and copies data to the S-VOL.
(Default)
- None creates the pair but data is not copied to the S-VOL. This
requires that data in the P-VOL and S-VOL are already identical.
c For Copy Pace, specify the number of tracks to be copied per remote
.
I/O during the operation. The default is 15 (fast copy pace). To
change the copy pace, enter a number from 1 to 4. This option affects
performance as follows:
- The speed of 1 is a slow copy pace, and is used to reduce impact on
host I/O.
- The speeds of 2 and 3 are a medium copy pace.
- The speed of 4 is a fast copy pace, and the host I/O performance
might be degraded.
If you enter a number from 5 to 15, the speed of 4 (fast copy pace) is
used.
d For Initial Copy Priority, specify the scheduling order for the initial
.
copy operation. The range is 1 to 256; 32 is the default.
If a time-out error occurs during this operation, the order specified in
Initial Copy Priority may not run as expected. A time-out error can
occur because of the CU configuration or data path error. Review the
error, delete the pair with an error, and then retry the operation.
8 Back again in the Primary Volume Selection box, select the primary
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volume to be copied first and click Add. The volume and pair information
moves to the Selected Pairs table.
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
TC pair operations
6-5