Cache Failure; Unregistered Error Code For Tpc-R - HP StorageWorks P9000 User Manual

If Basic HyperSwap is performed from TPC-R, the MIH value of the host I/O and host operation
needs to be approximately one second.
If the Basic HyperSwap function is performed from TPC-R, the resources in the host system must be
ensured sufficiently. If the shortage of resources occurs, resynchronization for Cnt Ac-S Z synchronous
pair may fail with the messages of IOSHM0803E (HyperSwap Disabled) and IOSHM0201I (Reason
Code:40) in the host system. If the resynchronization failed, restore the resource shortage, and
then delete the failed M-VOL and R-VOL Cnt Ac-S Z pair in suspend status from the TPC-R. The pair
create operation must be initiated again after the failed pair deletion.
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.
TPC-R cooperation support 25