Split And Suspend Types - HP StorageWorks P9000 User Manual

Split and suspend types

This section discusses pairs that are split by the user (PSUS), and pairs that are suspended by the
system (PSUE).
You can split a pair when the initial copy operation is complete.
You must split a pair must be to perform media maintenance on the P-VOL or to access
◦
the S-VOL (when S-VOL write is enabled).
◦ When you split a pair, the primary system ensures synchronization by completing any
pending update copy operation before changing the status to PSUS.
Pairs are split by the primary system only, for any of the following reasons:
◦ The user released the pair from the secondary system.
◦ An error condition related to the secondary system, the S-VOL, or an update-copy
operation.
The primary system cannot communicate with the secondary system.
◦
PSUS types appear on the Detailed Information dialog box. The following lists the PSUS types and
descriptions.
Table 19 PSUS types
Types
P-VOL by Operator
S-VOL by Operator
by MCU
Release pair to RCU
by RCU
S-VOL Failure
MCU IMPL
Initial Copy Failed
54 Monitoring and maintenance
Applies to Description
P-VOL The user split the pair from the primary system using the P-VOL Failure in the
Suspend Type option in the Suspend Kind field. The S-VOL split type is, "by
MCU."
P-VOL S-VOL The user split the pair from the primary or secondary system using the S-VOL
in the Suspend Type option in the Suspend Kind field.
S-VOL The secondary system received a request from the primary system to split the
pair. The P-VOL split type is Split-P-VOL by Operator or Split-S-VOL by
Operator.
P-VOL The primary system detected that the S-VOL status changed to SMPL because
the user released the pair from the secondary system. The pair cannot be
resynchronized because the S-VOL does not have the PSUE/PSUS status.
P-VOL S-VOL The primary system detected an error condition at the secondary system
(RCU), that caused the primary system to suspend the pair. The S-VOL suspend
type is S-VOL Failure by MCU.
P-VOL S-VOL The primary system detected an error during communication with the
secondary system, or an error during update copy. In this case, the S-VOL
suspend type is usually S-VOL Failure. This suspend type is also used when
the number of paths falls below the minimum number of paths setting on the
RCU Option dialog box.
P-VOL S-VOL The primary system could not find valid control information in its nonvolatile
memory during IMPL. This condition occurs only if the primary system is
without power for more than 48 hours (for example, power failure and fully
discharged backup batteries).
P-VOL S-VOL The pair was suspended before the initial copy operation was complete. The
data on the S-VOL is not identical to the data on the P-VOL.