HP 12000 HP VLS Solutions Guide Design Guidelines for Virtual Library Systems - Page 58

VLS12000 EVA Gateway Connectedto an EVA, Path A-Failover only

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Figure 21 VLS12000 EVA Gateway Connected to an EVA • Ensure that the zoning configuration is complete and that storage ports 2 and 3 on each VLS node connect to different switches/fabrics or zones. The EVA controllers must also be connected to both switches/fabrics or zones. • VLS nodes can be configured through the EVA to have dual Fibre Channel paths to the back-end disk arrays. With dual paths, if one path fails the node can still access each LUN through the remaining path(s). To get the best performance from the EVA, you must have balanced performance across the array controllers. To address these requirements: ◦ VLS software will automatically recognize the multiple paths to the disk array LUNs. If it does not, revisit your configuration and make changes as necessary so that the software does recognize all paths upon rebooting the system. ◦ Path failure is reported through the array information presented in the graphical user interface. NOTE: Path failure can reduce throughput for backup and restore operations. ◦ Balance data traffic across both controllers of the array (called A and B in Command View VLS). To do this, ensure that the preferred path for half of the VRaids in the array is set to Path A-Failover only, and the preferred path for the other half of the VRaids in the array is set to Path B-Failover only. • The EVA LUNs must be fully initialized and ready for use before attaching the VLS to the EVA. It can take several hours to initialize an entire EVA; therefore, HP advises you to create the LUNs in advance of the installation. 58 VLS Devices

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Figure 21 VLS12000 EVA Gateway Connectedto an EVA
•
Ensure that the zoning configuration is complete and that storage ports 2 and 3 on each VLS
node connect to different switches/fabrics or zones. The EVA controllers must also be connected
to both switches/fabrics or zones.
•
VLS nodes can be configured through the EVA to have dual Fibre Channel paths to the back-end
disk arrays. With dual paths, if one path fails the node can still access each LUN through the
remaining path(s). To get the best performance from the EVA, you must have balanced
performance across the array controllers. To address these requirements:
◦
VLS software will automatically recognize the multiple paths to the disk array LUNs. If it
does not, revisit your configuration and make changes as necessary so that the software
does recognize all paths upon rebooting the system.
◦
Path failure is reported through the array information presented in the graphical user
interface.
NOTE:
Path failure can reduce throughput for backup and restore operations.
◦
Balance data traffic across both controllers of the array (called A and B in Command
View VLS). To do this, ensure that the preferred path for half of the VRaids in the array
is set to
Path A-Failover only
, and the preferred path for the other half of the VRaids in
the array is set to
Path B-Failover only
.
•
The EVA LUNs must be fully initialized and ready for use before attaching the VLS to the EVA.
It can take several hours to initialize an entire EVA; therefore, HP advises you to create the
LUNs in advance of the installation.
58
VLS Devices