Overview: Stretched Clusters
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4.
Use Symphony to mirror the CRs that are created during the initial configuration of the 7700
FSP storage cluster. On each 7700 FSP Controller, a separate storage pool is created for its
local CR, and its mirror CR resides on a shelf at the remote site.
For specific details and procedures for configuring a CR and configuring failover in which the
CR is mirrored in a stretched cluster, see the topics for creating a CR and for configuring failover
for a 7700 FSP or stretched cluster in the latest version Symphony Help.
5.
To enable synchronous mirroring for application data, matching storage cluster LUNs need to
be created on the shelf at both, local and remote sites.
Networking and Tiebreaker Requirements
A stretched cluster requires meeting the following networking and Tiebreaker requirements:
1.
The 10Gbps SCI (Storage Cluster Interlink) optical ports (SCI-0) on the 7700 FSP Controllers
in the stretched cluster need IP network access to communicate with each another.
Connectivity can be via a direct LAN link, a long-distance fibre connection, or via a Fiber Optic
WAN transport connection with 1Gbps guaranteed minimum bandwidth between the two
remote sites. The SCI-1 ports do not need to be connected for stretched cluster operations.
If there is existing network connectivity between the two sites in a stretched cluster, link the SCI-
0 ports over that connection (provided that this connection meets the 1Gbps guaranteed
minimum bandwidth).
2.
Each 7700 FSP Controller and storage cluster shelf needs management and HA monitor IP
addresses that are accessible from both the local and remote sites, and from the Symphony
server which uses these IP addresses for storage management and monitoring.
3.
A Linux server is needed as the location for the Tiebreaker utility. Ideally, the Tiebreaker utility
should reside at a 3rd site or in the Cloud, and it needs IP network access to both 7700 FSP
Controller management and monitoring IP addresses.
The Tiebreaker utility is deployed to prevent a split-brain scenario condition, in which both 7700
FSP Controllers assume that the other one has failed. It is recommended that the Tiebreaker
utility be installed on a dedicated physical Linux-based server or on a virtual machine that has
Linux OS installed.
Note:
The IP addresses associated with the IPMI ports on both 7700 FSP Controllers must
be accessible via Tiebreaker using valid IPMI credentials.
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Страница 12: ...Preface 6 7700 Flash Storage Platform Installation Guide 7 6 3 x 530 0267 00 Rev 02 ...
Страница 122: ...Appendix A System Reference 116 7700 Series Flash Storage Platform Installation Guide 7 6 3 x 530 0267 00 Rev 02 ...
Страница 144: ...Appendix C Configuring Replication 138 7700 Flash Storage Platform Installation Guide 7 6 3 x 530 0267 00 Rev 02 ...
Страница 180: ...Appendix G Managing HA Using CLI Commands 174 7700 Flash Storage Platform Installation Guide 7 6 3 x 530 0267 00 Rev 02 ...
Страница 195: ...Korea RFI Statement 530 0267 00 Rev 02 7700 Flash Storage Platform Installation Guide 7 6 3 x 189 Korea RFI Statement ...
Страница 202: ...Appendix H Compliance Information 196 7700 Flash Storage Platform Installation Guide 7 6 3 x 530 0267 00 Rev 02 ...
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