beautypg.com

Suspended truecopy asynchronous pairs, 12 truecopy asynchronous suspension conditions, Suspended – HP StorageWorks XP Remote Web Console Software User Manual

Page 39: Truecopy asynchronous pairs, Table 11

background image

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

This manual is related to the following products: