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Table 5 Failure conditions and resolutions
Resolution stepsFailure condition
None. The primary site will continue to operate.Secondary site offline
None. The primary site will continue to operate.Network link between sites fails
Primary site offline 1. If any of the storage systems running managers in the primary site
can be brought back online, you should do this first.
2. If all storage systems in the primary site are lost forever, you can use
the Recover Quorum command-line function to recover quorum in the
secondary site manually. For more information, see “Recover quorum
operation,” next in this section
Alternative setups
The Multi-Site SAN software supports many other valid configurations than the four illustrated in
the prior section. Table 6 (page 18) lists other possible configurations.
Table 6 Alternative Multi-Site SAN configurations
DetailsDescriptionAlternate configuration
The Multi-Site SAN software supports running
many clusters in the same management
Multiple clusters running within the
same management group.
More than one Multi-Site cluster in
the management group
group. You simply need to make sure that
clusters have the same number of storage
systems in each site for that particular cluster.
A particular cluster can only span up to three
sites. However, the Multi-Site SAN software
There are more than three sites in
the cluster.
More than three sites
supports having more than one cluster. The
different clusters can span overlapping sites
within the other clusters. In the example
below, Cluster 1 and Cluster 2 are in the
same management group, and between
them they comprise four sites.
• Cluster 1
Site 1◦
◦ Site 2
◦ Site 3
• Cluster 2
◦ Site 2
◦ Site 3
◦ Site 4
You can use Remote Copy to replicate data
from a Multi-Site SAN to a Disaster Recovery
The cluster contains Remote Copy,
which like all other LeftHand OS
Using Remote Copy with Multi-Site
SAN
or Backup site. See the chapterfeatures, is compatible with
Multi-Site SAN. “Understanding and planning Remote Copy”
in the HP StoreVirtual Storage Remote Copy
User Guide.
The Multi-Site SAN software can be used to
create clusters that span multiple networks
The Multi-Site SAN features can be
used to set up clusters that span
multiple subnets in the same site.
Multiple subnet clusters in the same
site
(subnets) in larger Enterprise data centers.
The storage systems can reside in the same
or different sites. However, the cluster must
18 Designing a Multi-Site SAN