HP StorageWorks Modular Smart Array 1500 cs Installation Manual page 24

Installation Procedures - All Deployments
Note:
the ACU and Secure Path, on each server with access to the MSA1500 cs.
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Consider redundancies of power, storage, and data paths.
— To provide redundant power, plug the two power supplies on the
MSA1500 cs into separate Uninterruptable Power Supplies (UPS) on
separate sources of power.
If you have only one UPS, maintain separate power paths by plugging one
MSA1500 cs power supply to the UPS on one power source and plug the
other MSA1500 cs power supply to a separate power source.
— To provide redundant storage, configure your LUNs using fault-tolerant
RAID levels and striping methods.
Stripe the LUNs vertically across separate storage enclosures on different
SCSI buses, including drives from each bus.
— To provide redundant data paths, you must include two separate and
isolated Fibre Channel fabrics and the associated hardware and software
components in the configuration.
You must include two MSA1500 cs controllers, two Fibre Channel
interconnect devices (switches), and two HBAs in each server.
Environments using Secure Path software must install the software on
each server with access to the MSA1500 cs.
If you are connecting the MSA1500 cs to existing servers, you may need to
re-install some of your management software, such as Secure Path, after
installing the MSA1500 cs.
If your environment includes multiple servers, HP recommends designating
one of the servers as a management server, to centralize management tasks.
It is on this server that you install management software such as the ACU, and
it is from this server that you perform SAN management tasks.
In multi-path environments, you must install some management software, such as
Modular Smart Array 1500 cs Installation Guide