For instructions on setting virtual IDs, see the Hitachi Command Control
Interface Command Reference .
Related topics
• GAD and global storage virtualization on page 1-9
Monitoring GAD status
GAD operations are managed based on the following information:
• Pair status
• I/O mode of the P-VOL and S-VOL
• GAD status, which is a combination of pair status and I/O mode
Related topics
•
GAD status on page 1-10
•
GAD status transitions on page 1-11
• I/O modes on page 1-12
•
Relationship between GAD status, pair status, and I/O mode on page
1-13
• Global-active device and server I/O on page 1-14
GAD status
The following table lists and describes the GAD statuses.
GAD status Description
Data
redundancy
Updated
volume
Volume with
latest data*
Simplex The volume is not a pair volume. No Not applicable Not applicable
Mirroring The pair is changing to Mirrored status.
This status is issued when you do the
following:
• Prepare a quorum disk.
• Copy data from the P-VOL to the
S-VOL.
No P-VOL and S-
VOL
P-VOL
Mirrored The pair is operating normally. Yes P-VOL and S-
VOL
P-VOL and S-
VOL
Suspended The pair is suspended. I/O from the
server is sent to the volume with the
latest data.
When a failure occurs or the pair is
suspended, the status changes to
Suspended.
No P-VOL or S-
VOL
P-VOL or S-
VOL
Blocked I/O is not accepted by either pair
volume. This status occurs when:
No None P-VOL and S-
VOL
1-10
Overview of global-active device
Hitachi Virtual Storage Platform G1000 Global-Active Device User Guide
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