Fault Recovery -- HP
Continuous Access EVA
for Disaster Tolerance
Applications
HP StorageWorks Continuous Access EVA remote copy functionality is available for use with the
EVA4100 Starter Kits and EVA4100/6100/8100 arrays. For additional information about Continuous
Access EVA visit:
http://h18006.www1.hp.com/storage/software.html
Continuous Access EVA is a controller-based application that performs real-time replication between HP
StorageWorks Enterprise Virtual Arrays. The solution is enhanced to perform remote replication, and
deliver high data availability and performance to users on Fibre Channel based campus, metro or
continental Storage Area Networks (SANs).
HP StorageWorks Disaster Tolerant Solution for mySAP Business Suite on EVA offers a business
continuance solution for SAP environments, where data integrity and value added functionality are high
priorities. Best practices for implementing remote mirroring of an SAP database as part of an overall data
protection strategy with SAP applications can be found at:
http://h71028.www7.hp.com/ERC/downloads/4AA1-5683ENW.pdf
High Availability/ Fault
Tolerance/
Hot pluggable support
All EVA are configured with dual HSV controllers that operate in a redundant mode. Each controller has
redundant Fibre Channel (FC) host ports (2 for the EVA4100 Starter Kits EVA4100/6100 and 4 for the
EVA8100). Each EVA4100/6100 controller has two FC device ports and the EVA8100 controller has
four FC device ports. For the EVA4100 Starter Kits and EVA4100/6100/8100 in the event of a path
failure, the alternate paths to the controller can be utilized with the use of multi-path software in the
Operating System or in Secure Path software.
On the EVA4100 Starter Kits and EVA4100 each port connects to one FC I/O module on a drive
enclosure. Up to four drive enclosures can be connected in a FC loop arrangement with a controller pair
and connect to one port of up to 56 drives. With the two FC ports per controller, each controller can
connect to both ports on up to 56 disk drives for redundant paths to all 56 drives. On the EVA6100 each
port connects to a FC loop switch which in turn connects to one FC I/O module on up to eight drive
enclosures and to one port of up to 112 disk drives. On the EVA8100 each port connects to a FC loop
switch which in turn connects up to one FC I/O module on the drive enclosures and to one port of up to
168 disk drives. With the four FC ports, each controller can connect to both ports on up to 240 disk
drives for redundant paths to all 240 drives.
EVA8100 configurations, with more than four drive enclosures, are configured with two pairs of FC-AL
switches connected between the two controllers and the drive enclosures. Up to nine drive enclosures can
be redundantly connected to each pair of switches, which are redundantly connected to each controller.
Each loop switch is independently powered and cooled. Should one loop switch fail, it can be replaced
while I/Os continue through the remaining redundant loop switch.
The HSV controllers also have dual redundant hot plug power supplies and dual redundant hot plug
blowers. Each controller has hot plug cache batteries to maintain cache contents for up to 96 hours in
case of a total power failure.
The M5314C FC drive enclosure has dual redundant hot plug FC I/O modules that allow the controllers
to distribute I/Os between the two modules and provides redundant paths should either FC I/O module
become unavailable. The enclosure also has dual redundant hot plug power supplies and dual hot plug
blowers. The enclosure also has a hot plug Environmental Monitoring Unit (EMU) to monitor and report the
condition of the power supplies and fans. The EMU can be replaced without affecting I/O operations.
The FC and FATA disk drives have dual FC ports which can be redundantly accessed by each controller.
The drives are hot plug. The drives can be arranged, using redundant Vraid1 or Vraid5 protection, so that
a drive failure will not cause loss of data. Optional virtual sparing can be configured so that a drive
failure will trigger an automatic rebuild of the Vraid1 or Vraid5 protection using the virtual spare.
QuickSpecs
HP StorageWorks Enterprise Virtual Array Family
Product Highlights
DA - 12745 Worldwide QuickSpecs — Version 5 — 2.26.2008
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