HP XP P9500 Storage - Manual (Page 24)

The Basic HyperSwap function performed from TPC-R may fail, when the FREEZE command process
does not complete within 20 seconds. We recommend the following conditions to complete the
FREEZE command process within 20 seconds.
•
(Number of Host paths) x (Number of LPARs) x (Number of CGROUPs (Number of CUs)) ≤
160
•
Number of pairs ≤ 4,096
Figure 3 Configuration of Cnt Ac-S Z synchronous pair M-VOLs and R-VOLs using TPC-R
Cache failure
When a cache failure occurs on the storage system, recover the cache failure, and then
resynchronize the Cnt Ac-S Z pair from TPC-R. Resynchronizing the Cnt Ac-S Z pair before recovering
the cache failure causes the resynchronization to fail. In this case, TPC-R issues a pair-deletion
command and resynchronizes the Cnt Ac-S Z pair automatically. All data in the M-VOL is recopied
to the R-VOL.
Unregistered error code for TPC-R
When using Basic HyperSwap, an unregistered error code for TPC-R might be displayed. In this
case, recover the Cnt Ac-S Z pair using the method described in the following table.
Table 9 Unregistered error code for TPC-R
Recovery procedure Description Operation Error code
Remove the failure on the
cache, and then retry the Cnt
Ac-S Z pair creation operation. The Cnt Ac-S Z pair creation failed because
it was executed when a failure occurred in
the cache. Pair creation 0F0E
Remove the failure in the
cache, and then retry the Cnt The Cnt Ac-S Z pair resynchronization
operation failed because it was executed Pair
resynchronization
Ac-S Z pair resynchronization
operation. when a failure occurred in the cache.
Although the Cnt Ac-S Z pair is deleted and
recreated (a whole copy) by the recovery
operation of TPC-R from the Cnt Ac-S Z pair
resynchronization failure, the recovery
operation fails.
24 Requirements and specifications