HDvM - SN
status
CCI status Description
P-VOL
access
S-VOL
access
• When you release the pair from the
secondary system, that system changes
the S-VOL status to SMPL. The primary
system detects this and changes the P-
VOL status to PSUS. The pair must be
released from the primary system in
order to change P-VOL status to SMPL.
• CCI PSUS status indicates that although
the paired status is retained, the user
split the pair. This status is only for the
P-VOL. While the pair is split, the storage
system keeps track of updates to the P-
VOL in the differential bitmaps.
PSUE
(See also
Split types
on page
7-5.)
PSUE • If the primary system cannot keep the
pair synchronized for any reason, it
changes the status of the P-VOL and S-
VOL (if possible) to PSUE.
• The pair is not synchronized.
Read/Write.
Read only if
Primary
Volume
Fence Level
is Data.
Read Only
1
When pair status is COPY, neither cache nor control memory can be added to or removed from the
storage system. When either of these tasks is to be performed, first split any pairs in COPY status, and
then resynchronize when the cache or control memory operation is completed.
Split types
This topic discusses pairs that are split by user operation (PSUS ), and pairs
that are suspended by the system because of failure (PSUE).
• You can split a pair when the initial copy operation is complete.
¢
You must split a pair to access the S-VOL (when S-VOL write is
enabled).
¢
When you split a pair, the primary system ensures synchronization by
completing any pending update copy operation before changing the
status to PSUS.
• Pairs are split by the primary system only, for any of the following
reasons:
¢
You released the pair from the secondary system.
¢
An error condition related to the secondary system, the S-VOL, or an
update-copy operation.
¢
The primary system cannot communicate with the secondary system.
Split types appear in the Status field on the View Pair Properties window. The
following table describes the split types.
Monitoring and maintaining the TC system
7-5
Hitachi TrueCopy® User Guide for Hitachi Virtual Storage Platform Gx00 and Fx00 Models
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