Hp StorageWorks XP Remote Web Console Software Uživatelský manuál stáhnout pdf (Strana 48)

Pair Status Description

SEQCHK

The secondary storage system encountered a

non-time-stamped journal data for a URz pair

using the System timer type option. This status can

be displayed at the primary storage system and

secondary storage system, but the primary storage

system may not have the most current information.

Always use the pair status information displayed at

the secondary storage system for disaster recovery.

Hold

The pair is pr

epared for delta resync operation.

When the sta

tus of primary data volume is Hold, the

write data f

or the TCz Synchronous R-VOL is stored in

the master j

ournal volume.

Only the del

ta resync operation, releasing operation,

or changin

g pair option operation are allowed on

the pairs i

nHoldstatus.

Hlde An error occurred on the pair in Hold status. When

the status of primary data volume is Hlde, the write

data for the TCz Synchronous S-VOL will not be stored

in the master journal volume.

Only recovering pair status to standby (Hold)

operation, releasing operation, or changing pair

option operation are allowed on the pairs in Hlde

status.

Suspend Types

“Suspe

nd Types” on page 48 lists and describes the URz suspend types, which indicate the reason for the

suspen

sion. A URz pair can be suspended by the user at any time after the initial copy operation is

complete. The user must suspend a URz pair in order to perform ICKDSF maintenance on the primary

data volume or to access the secondary data volume (read only mode).

When a

URzpairissuspended by theuser, theprimary storagesystem and secondarystorage system

ensure synchronization by either completing or discarding any pending update copy operations

according to the user-speciﬁed drain/purge suspend option.

A URz pair is suspended by the primary storage system when the following suspension conditions

are detected. A URz pair can also be suspended by the secondary storage system (see

“Sus

pension Condition” on page 50).

• When the primary storage system detects that the user has released the volume pair from the

secondary storage system (e.g., to access an secondary data volume at the secondary site),

• When

the primary storage system detects an error condition related to the secondary storage

system, secondary data volume, or a URz journal data operation,

• When the secondary storage system cannot execute DFW (DASD fast write) to the secondary

data volume (only if DFW required is selected), or

• Whe

n the primary storage system is unable to communicate with the secondary storage system.

r more information on URz journal data operations, see “Suspension Condition”onpage50.

en a URz pair is suspended, the primary storage system stops performing update copy operations

to the secondary data volume. Moreover, the primary storage system and secondary storage system

keep track of any journal data that were discarded during suspension, and the primary storage system

continues accepting write I/Os for the primary data volume and keeps track of the primary data volume

tracks which are updated while the pair is suspended.

suspended URz secondary data volume has an additional status called the consistency status which is

displayed only at the secondary storage system. The consistency status of a suspended URz secondary

data volume indicates its update sequential consistency with respect to the other secondary data

olumes in thesamegroup.

Overview of Universal Replicator Operations

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