Priority for initial copy operations and scheduling order
Though you can specify a maximum number of initial copies to run
concurrently, you are allowed to perform more initial copies than this when
creating pairs. If you do this, you will set the scheduling order for the
additional operations in the Initial Copy Priority field when creating the pair.
This topic provides two examples in which priority and the pre-set scheduling
order are discussed.
Example 1: more initial copies than previously specified
In this example, four initial copies are being created in the same operation,
but Maximum Initial Copy Activities is set at 2. In this scenario, the Initial
Copy Priority field in the Create TC Pairs window would be set as shown in the
following table.
P-VOL Value set for Initial Copy Priority
LUN 00 2
LUN 01 3
LUN 02 1
LUN 03 4
The order for the initial copy and the Priority for the P-VOLs are shown in the
following table.
Order for initial copy P-VOL
Value set for Initial Copy
Priority
1 LUN 02 1
2 LUN 00 2
3 LUN 01 3
4 LUN 03 4
In this case, because the value of Maximum Initial Copy Activities is 2, initial
copy operations for LUN 02 and LUN 00 are started. If either one of the initial
copy operations for LUN 02 and LUN 00 is completed, the initial copy for LUN
01 is started.
Example 2: initial copy started, new pairs added
The following table shows the Priority value when the initial copy is already
begun and two new pairs are then added. The P-VOLs are for the new pairs.
P-VOL Value set for Initial Copy Priority
LUN 10 2
LUN 11 1
Planning for TrueCopy
3-15
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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