Hitachi AMS 2000 User Manual page 138

Table 9-1: Pair Status Definitions (Continued)
Pair Status
Split Updates to the S-VOL are suspended; S-VOL data is
consistent and usable by an application for read/write.
Data written to the P-VOL and to the S-VOL are
managed as differential data in the local and remote
arrays.
Pool Full If the local data pool capacity exceeds 90%, while status
is Paired, the following takes place:
•
•
Paired.
•
•
differential data
If the remote data pool capacity reaches 100% while the
pair status is Paired, the following takes place:
•
Full.
•
If a pair in a group becomes Pool Full, the status all pairs
in the group becomes Pool Full.
To recover, add LUs to the data pool or reduce use of the
data pool. Then resynchronize the pair.
•
when the data pool depletion occurs in pool #0, all the
pairs which use the data pool are changed to Pool Full.
In addition, all the pairs (using pool #1) in CTG to
which the pairs changed to Pool Full belong are
changed to Pool Full.
Takeover Takeover is a transitional status after Swap Pair is
initiated. The data in the remote data pool, which is in a
consistent state established at the end of the previous
cycle, is restored to the S-VOL. Immediately after the
pair becomes Takeover, the pair relationship is swapped
and copy from the new P-VOL to the new S-VOL is
started.
Busy Busy is a transitional status after Swap Pair is initiated.
Takeover occurs after Busy. This status can be seen from
the Navigator 2 GUI, though not from CCI.
Inconsistent This status on the remote array occurs when copying
from P-VOL to S-VOL stops due to failure in the S-VOL.
The failure includes failure of the HDD that constitutes
the S-VOL, or the data pool for the S-VOL becomes full.
To recover, resynchronize the pair, which leads to a full
volume copy of the P-VOL to the S-VOL.
9–4
Hitachi AMS 2000 Family TrueCopy Extended Distance User Guide
Description
Pair status on the local array changes to Pool Full.
Pair status on the remote array at this time remains
Data updates stop from the P-VOL to S-VOL.
Data written to the P-VOL is managed as
Pair status on the remote array changes to Pool
Pair status on the local array changes to Failure.
Pool Full is changed in units of CTG. For example,
Monitoring and maintenance
Access Access
to P-VOL to S-VOL
Read/ Read/
Write Write
(mounta
ble) or
Read only
Read/ Read
Write Only
Read/
Write
Read/
Write
No Read/
Write