HP StorageWorks P9000 User Manual page 82

Pair Status
Hlde
*Holding indicates that differential data to be used for a delta resync operation does not exist in the storage system,
or the storage system cannot judge whether the delta resync operation can be performed without the differential data.
When the differential data to be used for a delta resync operation does not exist in the secondary site of Cnt Ac-S Z
even if you update the data from the host on the primary site, the differential data might have been discarded due to
the following:
The cache or shared memory was added to or reduced from the storage system during the maintenance work.
The storage system was powered off during the maintenance work.
The Cnt Ac-J Z pair or Cnt Ac-S Z pair was suspended, and then the pair has been resynchronized.
The journal volume could not be accessed because the disaster or failure occurred in the secondary site of Cnt Ac-S
Z.
When a problem is fixed, differential data are stored in the Cnt Ac-S Z secondary site again if you update the data
in the primary site.
The status in which the delta resync operation can be executed without the differential data for the delta resync means
that the data update to the primary site is not executed or the both data of the Cnt Ac-S Z secondary site and the Cnt
Ac-J Z secondary site are coincident because the data update is stopped. To make the above mentioned condition,
make the configuration to execute the delta resync operation to support the remote command devices, and then change
the status of all Cnt Ac-J Z pair and Cnt Ac-S Z pair which belong to the desired journal in the primary site to PAIR by
the resynchronizing operation.
Even if the "delta resync operation" without the deferential data is executable, the pair status will change 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 disk system after the recovery from
the condition of the differential data discarding.
If you cannot connect to the secondary site of Continuous Access Synchronous due to failures or disasters, the transition
from Holding to Hold is not performed correctly.
Additional information on pair status
When a pair is split or suspended, the primary system notifies the host(s) with a service
information message (SIM). If SNMP is installed and operational for P9500, this SIM results
in an SNMP trap indicating the reason for suspension.
Transitional statuses occur when a request to change Continuous Access Journal Z pair status
to Suspended or Simplex has been accepted, but is not complete. Transition states are not
reported to the host.
The user and the primary or secondary systems can initiate the Suspended status change.
Only the user can perform release a pair.
If a user performs an operation, the final status is reported at the end of the operation.
If an error causes the status to change to Suspended, the status is reported at the beginning
of the transition.
A pair in Flush mode (remaining local update data is flushing to the secondary system) remains
in Suspending or Deleting status until data in the master and restore journals is the same and
the pair is completely split or released. To calculate the time during which the pair remains
Suspending or Deleting, use the following equation:
C x (u / 100) x 1,024 / V (The unit is seconds)
82 Monitoring the system
Description
An error occurred on the pair in Hold status.
When the status of P-VOL is Hlde, incoming write data for the Cnt Ac-S Z S-VOL is
not stored in the master journal volume.
Operations allowed on pairs in Hlde status are:
- Recovering pair status to standby (Hold)
- Pair-delete
- Changing pair options