HP StorageWorks XP Remote Web Console Software - Manual (Page 39)

Hitachi TrueCopy for z/OS user guide 39
Suspended TrueCopy Asynchronous pairs
TC390A operations involve additional suspension conditions related to the asynchronous recordset
operations. Both the MCU and RCU can detect TC390A suspension conditions and suspend TC390A
pairs. The following table describes the TC390A suspension conditions and indicates which CU detects the
condition and which volume pairs are suspended. The TC390A offloading timer asynchronous option (see
” Asynchronous copy option ” on page 108) and timeout group options (see ” Adding consistency groups
(Add CT Group) ” on page 105) are used to control the TC390A suspension conditions. For troubleshooting
information for TC390A suspension conditions, see Table 32 on page 156.
The MCU stores a cylinder bitmap in cache for each TC390A M-VOL and the RCU stores a cylinder bitmap
in cache for each TC390A R-VOL. When a TC390A pair is suspended, the cylinders that contain the
Table 11 Consistency status for suspended TrueCopy Async R-VOLs
Consistency
Status
Description
Volume This TC390A volume pair was probably suspended alone. Update sequence consistency
between this R-VOL and other R-VOLs in this consistency group is not ensured. This R-VOL cannot
be used for disaster recovery at the secondary system. This status is indicated when:
This volume pair was suspended due to a failure that did not affect the entire consistency group
and the Error Level pair option for this pair is set to Volume.
This volume pair was suspended by a user-initiated suspend pair operation with the TC390A
Suspend (Async) suspend option set to Volume.
Group This TC390A volume pair was suspended along with the other pair in its consistency group.
Update sequence consistency between this R-VOL and other R-VOLs in this consistency group is
ensured. This R-VOL can be used for disaster recovery at the secondary system after deleting the
TC390 volume pair from the RCU. This status is indicated when:
All volume pairs in this consistency group were suspended due to a failure that affected the entire
consistency group, not just one pair (for example, MCU-RCU communication failure).
The volume pair was suspended due to a failure that did not affect the entire group and the Error
Level TC390A pair option for this pair is set to Group.
This volume pair was suspended by a user-initiated suspend pair operation with the TC390A
Suspend (Async) suspend option set to Group.
Table 12 TrueCopy Asynchronous suspension conditions
Suspension Condition Detected by TC390A Pairs to be Suspended
The MCU could not send a pending recordset to the
RCU before the offloading timer asynchronous option
expired. See ” Inflow control of recordsets ” on page 31.
MCU All TC390A pairs with M-VOLs in the
MCU.
During MCU power-on, the MCU could not establish
communication with the RCU before the RCU ready
timeout group option expired. See ” Group options ” on
page 33.
MCU All TC390A pairs with M-VOLs in the
MCU.
The RCU could not settle a pending recordset before
the copy pending timeout group option expired.
RCU All TC390A R-VOLs in the consistency
group.
The RCU could not communicate with the MCU before
the copy pending timeout group option expired.
RCU All TC390A R-VOLs in the consistency
group.
The RCU could not receive the recordset successfully
due to a hardware failure.
RCU Only the affected R-VOL.
The RCU detected a logical error while selecting the
recordset to be settled.
RCU All TC390A R-VOLs in the group, or
only the affected R-VOL, depending on
the failure type and error level TC390A
pair option.
The RCU could not settle the recordset due to a
hardware failure, a track condition, or a logical error.
RCU