Pair Status Before And After A Split Operation; Consistency Group 127 - Hitachi G200 User Manual

Setting
Write access prohibited
No option selected
Setting
Read access permitted
Read/Write access permitted
No option selected

Pair status before and after a split operation

Pairs in the same consistency group must be in PAIR status when you begin
the split operation in order to maintain consistency. Otherwise, when the
operation completes, pair status will be inconsistent.

Consistency group 127

When you create pairs using Device Manager - Storage Navigator, you can
assign the pairs to only one consistency group, CTG 127. (You can also use
CCI to assign pairs to CTG 127.) With CTG 127, you can ensure the following:
• When a pair is split or suspended for any reason, you can ensure that all
P-VOLs in the group become suspended.
• If data paths between the secondary and primary system fail, you can
ensure that all S-VOLs are placed in PSUE status.
For more information, see
suspended on page
To assign pairs to CTG 127
1 Turn Function Switch 30 On.
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2 Create the pairs and assign them to CTG 127.
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Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
CTG 127 behavior and restrictions when a pair is
3-24.
Turn on the switch in the primary and secondary systems to get the
desired result in each system.
Turn on the switch in the system where you want the behavior: either
consistent P-VOL suspensions for the primary system, or consistent S-
VOL PSUE status for the secondary system.
In CCI, assign the pairs to this group number when you create the
pairs.
In Device Manager - Storage Navigator, pairs are automatically
assigned to CTG 127 when the pairs are created and function switch
30 is On.
Planning for TrueCopy
TC P-VOL
Read Write
Y N
Y Y
TC S-VOL
Read Write
Y N
Y Y
Y N
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