If you resynchronize a pair specifying the P-VOL, I/O continues on the P-VOL.
If you resynchronize a pair specifying the S-VOL, data flow switches from the
S-VOL to the P-VOL, and then I/O continues on the new P-VOL.
If you suspend a pair specifying the P-VOL, I/O continues to the P-VOL. If you
suspend a pair specifying the S-VOL, I/O continues to the S-VOL.
Pair status
The following table lists and describes the pair statuses, which indicate the
current state of a global-active device pair. As shown in the table, the pair
statuses displayed by CCI and Command Suite are slightly different.
Pair status
Description
CCI HCS
SMPL SMPL The volume is not paired.
COPY INIT/COPY The initial copy or pair resynchronization is in progress
(including creation of a GAD pair that does not perform
data copy). A quorum disk is being prepared.
COPY The initial copy is in progress; data is being copied from
the P-VOL to the S-VOL (including creation of a GAD pair
that does not perform data copy).
PAIR PAIR The pair is synchronized.
PSUS PSUS The pair was suspended by the user. This status appears
on the P-VOL.
PSUE PSUE The pair was suspended due to a failure.
SSUS SSUS The pair was suspended by the user, and update of the S-
VOL is interrupted. This status appears on the S-VOL.
SSWS SSWS The pair was suspended either by the user or due to a
failure, and update of the P-VOL is interrupted. This status
appears on the S-VOL.
Related topics
• Monitoring GAD status on page 1-10
I/O modes
The following table lists and describes the GAD I/O modes, which represent
the I/O actions on the P-VOL and the S-VOL of a GAD pair. As shown in the
following table, the I/O modes displayed by CCI and Command Suite are
slightly different.
1-12
Overview of global-active device
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide
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