Hp StorageWorks XP Remote Web Console Software Instrukcja Użytkownika Pobierz pdf (Strona 78)

Disaster Recov

eryfor Multiple Primaryand SecondaryStorage Systems

Consistency of Data Update Sequence When a Disaster Occurs

When a failure occurs in some primary or secondary storage system, all journal groups in the extended

consistency group will be suspended and remote copy operations will be suspended. The consistency

of data update sequence will be maintained if a failure occurs in a primary storage system, but the

consistency will not be maintained if a failure occurs in a secondary storage system.

For example, in the case described in Figure 20 on page 78, if a failure occurs in the primary storage

system 1 at 10:00 a.m., journal groups 1 to 3 will be suspended due to the failure, and the data written

from the host before 10:00 a.m. will be restored to secondary data volumes in the secondary EXCTG,

while consistency of data update sequence is maintained. On the other hand, if a failure occurs in

the secondary storage system 1, journal groups 1 to 3 will be suspended due to the failure, and the

consistency of the data update sequence will not be maintained for secondary data volumes in the

extended consistency group.

Write data

Primary host

Extended consistency group

Master JNL VOL

Primary storage system 1

Primary data

volume

Master JNL VOL

Primary data

volume

Master JNL VOL

Primary storage system 3

Primary data

volume

Secondary data

volume

Restore JNL VOL

Secondary storage system 1

Secondary data

volume

Restore JNL VOL

Secondary storage system 2 Primary storage system 2

Secondary data

volume

Secondary storage system 3

Journal group 1

Journal group 2

Journal group 3

Restore JNL VOL

Figure 20 Example2: RemoteCopyOperationsAmong ThreePrimary Storage

Systems and Three Secondary Storage Systems

Disa

ster Recovery Procedure

The

following is an example of the procedure that should be followed when a disaster or failure occurs in

the

primary site in multi-primary and multi-secondary storage systems conﬁguration:

1. Swi

tch operations from the primary site to the secondary site.

2. Reverse the copy direction, so that data are copied from the secondary site to the primary site.

Preparing for Universal Replicator z/OS Operations

1 2 ... 73 74 75 76 77 78 79 80 81 82 83 ... 218 219

Komentarze do niniejszej Instrukcji

Brak uwag

Hp StorageWorks XP Remote Web Console Software Instrukcja Użytkownika Strona 78

Komentarze do niniejszej Instrukcji

Powiązane produkty i podręczniki dla Przechowywanie Hp StorageWorks XP Remote Web Console Software