Novell BUSINESS CONTINUITY CLUSTERING 1.1 SP2 - ADMINISTRATION, Руководство администратора, Страница: 45 / 142

Installing Business Continuity Clustering 45
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4.1.12 Shared Disk Systems
For Business Continuity Clustering, a shared disk system is required for each peer cluster in the
business continuity cluster. See “
Shared Disk System Requirements ” in the OES 2 SP2: Novell
Cluster Services 1.8.5 for NetWare Administration Guide .
In addition to the shared disks in an original cluster, you need additional shared disk storage in the
other peer clusters to mirror the data between sites as described in
Section 4.1.13, “Mirroring Shared
Disk Systems Between Peer Clusters,” on page 45 .
4.1.13 Mirroring Shared Disk Systems Between Peer Clusters
The Business Continuity Clustering software does not perform data mirroring. You must separately
configure either storage-based mirroring or host-based file system mirroring for the shared disks that
you want to fail over between peer clusters. Storage-based synchronized mirroring is the preferred
solution.
IMPORTANT: Use whatever method is available to implement storage-based mirroring or host-
based file system mirroring between the peer clusters for each of the shared disks that you plan to
fail over between peer clusters.
For information about how to configure host-based file system mirroring for Novell Storage
Services pool resources, see
Appendix D, “Configuring Host-Based File System Mirroring for NSS
Pools,” on page 137 .
For information about storage-based mirroring, consult the vendor for your storage system or see the
vendor documentation.
4.1.14 LUN Masking for Shared Devices
LUN masking is the ability to exclusively assign each LUN to one or more host connections. With it,
you can assign appropriately sized pieces of storage from a common storage pool to various servers.
See your storage system vendor documentation for more information on configuring LUN masking.
When you create a Novell Cluster Services system that uses a shared storage system, it is important
to remember that all of the servers that you grant access to the shared device, whether in the cluster
or not, have access to all of the volumes on the shared storage space unless you specifically prevent
such access. Novell Cluster Services arbitrates access to shared volumes for all cluster nodes, but
cannot protect shared volumes from being corrupted by non-cluster servers.
Software included with your storage system can be used to mask LUNs or to provide zoning
configuration of the SAN fabric to prevent shared volumes from being corrupted by non-cluster
servers.
IMPORTANT: We recommend that you implement LUN masking in your business continuity
cluster for data protection. LUN masking is provided by your storage system vendor.
4.1.15 Link Speeds
For real-time mirroring, link speeds should be 1 GB or better, the Fibre Channel cable length
between sites should be less than 200 kilometers, and the links should be dedicated.