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38 SVA Path User’s Guide

SVA Path installations, SVA Path creates a single additional

device filename for applications to access the device and manages

the original device files transparently to those applications.

Note: It is the virtual device file that will be used by applications

to access that device. The original, redundant data paths should

never be used to access the device, or the data it contains could be

corrupted.

For example, an SVA might present a single physical disk device

to the HP-UX host as

c1t0d0 and c2t0d0. SVA Path creates a

third device file named c81t0d0 that is used by applications to

access the storage. It blocks applications’ access to the original two

device files.

How Device

Filenames Are

Chosen

In order to provide interoperability with complementary storage

management software (e.g., Logical Volume Manager), SVA Path

uses standard HP-UX device names in the form

cXtYdZ, where X

represents a controller or HBA number, Y represents a SCSI target

number, and

Z represents a SCSI LUN.

When SVA Path adds new device files to the system and changes

the device names by which pre-existing devices must be accessed,

the new device files, in order to be as easily understood as

possible, retain the SCSI target and LUN from the original device

files.

For example, a set of physical devices might originally be

accessible via HBAs

c1 and c2. SVA Path will create new, virtual

disk device files whose names start with

c81 and which have the

same target and LUN numbers as the original device files.

Therefore, a device originally accessible via the fibre channel or

SCSI disk driver device files c1t4d0 and c2t4d0 will, after SVA

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Seagate ST39103LC Uživatelská příručka Strana 48