Hitachi TrueCopy for z/OS user guide (December 2005)

40 TrueCopy for the XP128/XP1024/XP10000/XP12000
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 102) and timeout group options (see ”Adding Consistency Groups
(Add CT Group)” on page 99) are used to control the TC390A suspension conditions. For troubleshooting
information for TC390A suspension conditions, see Table 29 on page 146.
MCU P/S-OFF R-VOL
(TC390A only)
The RCU received a request from the MCU to suspend the R-VOL due to
MCU power-off. The RCU stops expecting recordsets from that MCU.
by sidefile
overflow
M-VOL, R-VOL
(TC390A only)
The amount of sidefile exceeds the specified “current pending update
data rate” and the RCU data is not transferred within the specified
“offloading timer”.
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 10 Suspend types (continued)
Suspend Type Applies to Description
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 32.
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 35.
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.