Hp StorageWorks XP Remote Web Console Software Instrukcja Użytkownika Pobierz pdf (Strona 64)

Cacheand NonvolatileStorage (NVS)

Cache and nonvolatile storage (NVS) must be operable for both the primary storage system and

secondary storage system of a URz data volume pair. If not, the URz add pair operation will fail. The

remote storage system cache should be conﬁgured to adequately support not only the local workloads

but also the UR

z remote copy workloads.

Duplicate Volumes

Since the contents of the primary data volume and secondary data volume of a URz pair are identical,

the secondary data volume can be considered a duplicate of the primary data volume. Since 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 URz secondary data

volume so they do notauto-mountorcomeonline tothe same host at the sametimeasthe primary

data volume (see WARNING below).

URz does not allow the secondary data volume to be online (except while the pair is split). If the

secondary data volume is online, the URz add pair operation will fail.

WARNING: If the URz secondary data volumes are physically attached to the same host server(s) as

the URz primary data volumes, the following problem can occur:

When a URz pair is released, the old secondary data volume is usually ofﬂine. If the host is then

restarted, the system administrator may be offered both volumes and asked which volume should be left

ofﬂine. This can be confusing and is prone to error.

If the URz secondary data volumes and primary data volumes are connected to the same host(s), HP

strongly recommends that the secondary data volumes are deﬁned to remain ofﬂine to avoid this problem.

Installing the Hardware

Initial installation of the URz hardware is performed by the user and the HP representative. To install the

hardware r

equired for URz operations:

1. User: Identify the locations of the URz primary and secondary data volumes (primary data

volumes and secondary data volumes), so that the URz hardware can be installed and

conﬁgure

dproperly.

2. User and HP Representative: Make sure that the primary storage system(s) and secondary

storage system(s) are conﬁgured for XP Remote Web Console operations (e.g., SVP connected

to LAN). Refer to the XP Remote Web Console user’s guide for information and instructions on

setting up XP Remote Web Console operations.

3. HP Repre

sentative: Make sure that the primary storage systems and secondary

storag

esystems areproperlyconﬁgured for URz operations (e.g., cache, NVS) (see

“Cache and Nonvolatile Storage (NVS)” on page 64. Make sure that the desired system option

modes are enabled (see Table 3 on page 37). Make sure that adequate cache is installed and

available for URz operations. You must also consider the amount of Cache Residency Manager

data to be stored in cache when determining the required amount of cache.

4. HP Representative: Make sure theprimary storagesystems areconﬁgured to report sense

information to the host(s). The secondary storage systems should also be attached to a host

server to enable reporting of sense information in case of a problem with an secondary data

volume or secondary storage system. If the remote site is unattended, the secondary storage

sys

tems should be attached to a host server at the primary site, so that the system administrator

can monitor the operational condition of the secondary storage systems.

5. HP Representative: If powersequencecontrol cables areused, setthe powerselectswitchfor the

cluster to LOCAL to prevent the primary storage system from being powered off by the host. Also

make sure the secondary storage system will not be powered off during URz operations. See

“Setting up Remote Copy Connections” on page 65 for further information on powering off/on

he primary storage systems and secondary storage systems.

Preparing for Universal Replicator z/OS Operations

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