HP XP P9500 Storage - Manual (Page 68)

S-VOL access P-VOL
access Description RAID Manager status RWC status
If the delta resync operation is run on a pair in HOLDING
status, the operation could fail. If you specify Entire for the
delta resync Failure field on the Change Journal Option
dialog box, differential data is copied to an S-VOL.
- Read/Write
1
(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
4
This status results when the journal volume becomes full and
suspends. Pair status changes from COPY, PAIR or PFUL to
PFUS. The Cnt Ac-J pair is suspended and the copy operation PFUS (No parallel
RWC status)
option is
enabled.
stops. Make sure to review configuration of the logical 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 81) 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 (No parallel
RWC status)
1. Accessing the P-VOL depends on the status of the Cnt Ac-S pair that shares the volume.
2. 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.
If the configuration is a 3 Cnt Ac-J DC, the host cannot write data regardless of whether the status of the mirror is not HOLD.
3. 2: 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. If the configuration is a 3 Cnt Ac-J DC, the host cannot write data regardless of the status of the mirror that is not
HOLD.
4. 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 primary
site.
The delta resync operation can be executed without differential data if the primary 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.
To execute the delta resync without differential data, set up remote command devices for the delta resync configuration (see
“Assigning remote command devices ” (page 148) ). Then change the status of Cnt Ac-J and Cnt Ac-S pairs that belong to the
journal in the primary site to PAIR by the resynchronizing operation.
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
68 Monitoring the system