Hp XP Continuous Access Software Manual do Utilizador descarregar pdf (Página 53)

NOTE:

When Continuous Access XP Journal and Universal Replicator for z/OS coexist in the same local array,

each journal group must contain either Continuous Access XP Journal pairs or Universal Replicator for

z/OS pairs (not both).

Accessing Continuous Access XP Journal primary and secondary data volumes

To ensure maximum data integrity during normal Continuous Access XP Journal operations, the secondary

array rejects all write operations issued by a host to a Continuous Access XP Journal secondary data

volume. If you need a write operation to a Continuous Access XP Journal secondary data volume, you

must set the secondary data volume's write option (see Secondary data volume write option). When

resuming (Pairresync) the split pair, the secondary array sends the secondary data volume's track bitmap

to the primary array to ensure proper pair resynchronization.

Cache and nonvolatile storage (NVS)

Cacheandnonvolatilestorage(NVS)mustbeoperablefortheprimaryandsecondaryarraysofa

Continuous Access XP Journal data volume pair. If not, the Continuous Access XP Journal paircreate

operation fails. The remote array cache should be conﬁgured to adequately support Continuous Access

XP Journal remote copy workloads and local workload activity.

Duplicate volumes

Because the contents of a Continuous Access XP Journal pair's primary and secondary data volumes

are identical, the secondary data volume can be considered a duplicate of the primary data volume.

Because the host operating system does not allow duplicate volumes, the host system administrator must

take precautions to prevent system problems related to duplicate volumes. You must deﬁne the Continuous

Access XP Journal secondary data volume so it does not auto-mount or come online to the same host at

the same time as the primary data volume.

Continuous Access XP Journal does not allow the secondary data volume to be online (except while the

pair is split). If the secondary data volume is online, the Continuous Access XP Journal paircreate

operation fails.

CAUTION:

If the Continuous Access XP Journal secondary data volume is physically attached to the same host

servers as the Continuous Access XP Journal primary data volumes, the following problem can occur:

• When a Continuous Access XP Journal pair is deleted, if the host is then restarted, the system

administrator might be offered both volumes and asked which volume should be left ofﬂine. This can

be confusing and is prone to error.

If the Continuous Access XP Journal secondary and primary data volumes are connected to the same

hosts, HP strongly recommends that you deﬁne secondary data volumes to remain ofﬂine to avoid

this problem.

Port c

onﬁgurations

When c

onﬁguring a system for using Continuous Access XP Journal, ensure that ports are conﬁgured

correctly.

Table 16 and Table 17 explain cases of illegal port conﬁgurations. For example, as the ﬁrst row of

Table 16 indicates, if you use the CL1-A port as an RCU target port in the Continuous Access XP Journal

prima

ry site, you must not use the CL1-A or CL5-A port as a target port in the Continuous Access XP

Jour

nal primary site. Also, if you conﬁgure a system in a 3-data center (3DC) cascading conﬁguration

(see

Combining Continuous Access XP Journal with Continuous Access XP (3DC cascading conﬁguration))

Continuous Access XP Journal user guide

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