HP 6100 HP 4x00/6x00/8x00 Enterprise Virtual Array User Guide (5697-0733, Marc - Page 158
Risks, OpenVMS configuration, Requirements, HBA configuration
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Risks • For nonclustered nodes with a single HBA, a path failure from the HBA to the SAN switch will result in a loss of connection with storage devices. • If a host crashes or experiences a power failure, or if the path is interrupted, data will be lost. Upon re-establishment of the path, a retransmit can be performed to recover whatever data may have been lost during the outage. The option to retransmit data after interruption is application-dependent. NOTE: For additional risks, see Table 60 (page 165). Figure 54 Tru64 UNIX configuration 1 Network interconnection 2 Host 1 3 Host 2 4 Management server 5 SAN switch 1 6 SAN switch 2 7 Controller A 8 Controller B OpenVMS configuration Requirements • Switch zoning or controller level SSP must be used to ensure each single path HBA has an exclusive path to its LUNs. • All nodes with direct connection to a disk must have the same access paths available to them. • Single path HBA server can be in the same fabric as servers with multiple HBAs. • In the use of snapshots and snapclones, the source virtual disk and all associated snapshots and snapclones must be presented to the single path hosts that are zoned with the same controller. In the case of snapclones, after the cloning process has completed and the clone becomes an ordinary virtual disk, you may present that virtual disk as you would any other ordinary virtual disk. HBA configuration • Host 1 is a single path HBA host. • Host 2 is a dual HBA host. See Figure 55 (page 159). 158 Single Path Implementation