HP XP7 Storage - Manual (Page 64)

S-VOL access P-VOL access Description RAID Manager status RWC status
- Read/Write (No parallel RAID
Manager status) HLDE • An error occurred on a pair in HOLD status.
•
When P-VOL status is HLDE, incoming write data
for the Cnt Ac-S S-VOL is not stored in the master
journal volume.
• Operations allowed on pairs in HLDE status:
- Recover pair status to standby (HOLD)
- Pair delete
- Change pair options
Read Only,
unless write Read /Write This status results when the journal volume becomes
full and suspends. Pair status changes from COPY, PFUS
3
(No parallel
RWC status)
option is
enabled. PAIR or PFUL to PFUS. The Cnt Ac-J pair is suspended
and the copy operation stops. Make sure to review
configuration of the remote path and journal volume.
•
If a Thin Provisioning virtual volume (THP V-VOL) is
used as the Cnt Ac-J S-VOL, and the capacity of a
pool-VOL is nearly full, Cnt Ac-J status becomes
PFUS and the pair is suspended.
• If the journal option Inflow Control is set to Yes when
status changes to PFUS, the pair is not suspended
for the time set in the Data Overflow Watch field,
even when the journal volume becomes full. During
the time it takes for the journal data area to clear,
the response to host I/O is delayed.
See “Changing options used by journals ”
(page 75) for more information on Data Overflow
Watch.
Read/Write Read Only After Takeover, SSWS is the status of the S-VOL. With
this status, data can be written to the S-VOL. SSWS
3
(No parallel
RWC status)
1. The Cnt Ac-J S-VOL in HOLD status uses two mirrors. Accessing the S-VOL depends on the status of the mirror that is not HOLD.
2. HOLDING indicates either that differential data used for a delta resync operation does not exist or that the system cannot
judge whether the delta resync can be performed without the differential data.
When differential data does not exist in the secondary Cnt Ac-S site, even after the S-VOL is updated, the differential data
might be discarded due to the one of the following reasons:
• The cache or shared memory was added to or removed from the system during maintenance work.
• The system was powered off during maintenance work.
• The Cnt Ac-J or Cnt Ac-S pair was suspended and then resynchronized.
After the system is back to normal, differential data is stored again in the Cnt Ac-S S-VOL if you update the data in the local
site.
The delta resync operation can be executed without differential data if the local site has not received a data update or if data
in the Cnt Ac-S S-VOL and the Cnt Ac-J S-VOL is the same.
Even if the delta resync operation without differential data is executable, the pair status changes to HOLD regardless of the
differential data existing if the conditions of the differential data discarding are satisfied as mentioned above. To change the
status of the pair to HOLD, update the data in the primary system after the recovery from the condition of the differential data
discarding.
If you cannot connect to the remote site of Cnt Ac-S due to failures or disasters, the transition from HOLDING to HOLD is not
performed correctly.
3. In RAID Manager, the suspend status of the pair displays instead of HOLD/HOLDING/HLDE. If you run the delta resync
operation, the pair status of the last pair may display (PSUE, PFUS or SSWS).
64 Monitoring the Cnt Ac-J system