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Continuous Access XP user guide for the XP1024/XP128 101

Analyzing consistency of Continuous Access XP Asynchronous S-VOLs

Table 21 shows how to determine the consistency of a Continuous Access XP Async S-VOL based on its

pair status and consistency status. For Continuous Access XP Async S-VOLs with a consistency status of LU,

the volume is not consistent with other volumes in the same group, and further analysis is required to

determine the currency of each of these S-VOLs. Determine currency of these S-VOLs using the sense

information transferred via host failover software or comparing contents of the S-VOL with other files

confirmed to be current (such as database log files). These S-VOLs should be recovered using files

confirmed to be current.

Remember that the Continuous Access XP Async time-stamp and C/T information indicates MCU service

processor time, not host system time.

NOTE: Actual data recovery must be done using recovery point data in the database redo log.

PAIR Data

Status

Current. This S-VOL is synchronized with its P-VOL.

Never Needs to be analyzed. This S-VOL requires further analysis to determine its

level of currency.

PSUE -

initial copy failed

Data

Status

Never

Inconsistent. This S-VOL is not synchronized because not all cylinders have

been copied from the P-VOL yet. This S-VOL must be initialized (or copied

from the P-VOL at a later time).

PSUS -

S-VOL by

operator

Data

Status

Never

Suspect. This S-VOL is not synchronized with its P-VOL if any write I/Os were

issued to the P-VOL after the pair was split. This pair should be restarted

using the Entire Volume initial copy option, but the None option can be used

if you are sure no data on the P-VOL changed.

PSUS/PSUE -

all other types

Data Current. This S-VOL is synchronized with its P-VOL.

Status

Never

Suspect. This S-VOL is not synchronized with its P-VOL if any write I/Os were

issued to the P-VOL after the pair was split or suspended. Restore consistency

of this S-VOL and update it, if required. The time of suspension indicated on

the Pairdisplay pane helps determine the last time this S-VOL was updated.

Table 20 Determining Continuous Access XP Synchronous S-VOL currency based on its pair status and

P-VOL fence-level setting (continued)

Status of S-VOL Fence level Currency of S-VOL

Table 21 Determining Continuous Access XP Async S-VOL consistency based on its pair status and

consistency status

Status of

S-VOL

Usable for

Recovery?

Description

PAIR

COPY

SMPL

These states do not usually occur during

Continuous Access XP Asynchronous

disaster recovery because the RCU suspends all

Continuous Access XP Async

S-VOLs when communications with the MCU is lost.

Continuous Access XP

Async S-VOLs in these states should not be used for disaster recovery.

Simplex volumes cannot be distinguished from S-VOLs already deleted by the

pairsplit-S operation.

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