Hp StorageWorks XP Remote Web Console Software Instrukcja Użytkownika Pobierz pdf (Strona 76)

• The consistency time of an extended consistency group is the latest time stamp of the restored

data in the group in which consistency is guaranteed.

In the example shown in Figure 18 on page 75, the consistency time of the extended consistency

group is 15:00.

• The consistencytimeofajournalgroup is thelatesttimestamp of therestoreddata.

In the example shown in Figure 18 on page 75, the consistency times of journal groups 1 to 4

are as follows.

• The consistency time of Journal group 1 is 15:00.

• The consistency time of Journal group 2 is 14:02.

• The consistency time of Journal group 3 is 14:03.

• The consistency time of Journal group 4 is 14:04.

• The consistency time of a data volume pair is the latest time stamp of the data that has been

restored when the pair becomes suspended.

In the example shown in Figure 18 on page 75, if a pair in the journal group 1, 2, 3 or 4 is

suspended immediately after data are restored, the consistency time of the pair will be as follows.

• If a pair in Journal group 1 is suspended, the consistency time will be 15:00.

• If a pair in Journal group 2 is suspended, the consistency time will be 14:02.

• If a pair in Journal group 3 is suspended, the consistency time will be 14:03.

• If a pair in Journal group 4 is suspended, the consistency time will be 14:04.

If a failure occurs in a primary storage system and then you wish to recover from the failure, please

restore journal data with time stamps later than the consistency time of the extended consistency

group to secondary data volumes. For example, in the case described in Figure 18 on page 75,

the consistency time of the extended consistency group is 15:00, and therefore you must restore

the following data to secondary data volumes.

• Datawiththe time stamp15:02 in journalgroup 2

• Datawiththe time stamp15:03 in journalgroup 3

• Datawiththe time stamp15:04 in journalgroup 4

If a failure occurs in a secondary storage system and then you wish to recover from the failure,

please compare the consistency times of all journal groups in the extended consistency group, and

then identify the oldest consistency time. Next, please restore all data with time stamps later than

the oldest consistency time, to the secondary data volume. For example, in the case described in

Figure 18 on page 75, the consistency time of journal group 2 is the oldest among journal groups

1 to 4. Since the consistency time of journal group 2 is 14:02, you must restore the following data

to secondary data volumes.

• Datawiththe time stamp15:00 in journalgroup 1

• Datawiththe time stamp15:02 in journalgroup 2

• Data with the time stamp 14:03, and data with the time stamp 15:03 in journal group 3

• Data with the time stamp 14:04, and data with the time stamp 15:04 in journal group 4

Con

nections Among Secondary Storage Systems

If y

ou use more than one primary subsystem and more than one secondary subsystem, you must establish

connections among the secondary subsystems. To do this, you must conﬁgure paths and ports. Also, you

must create remote command devices by using Universal Volume Manager.

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