Seagate ST39103LC Podręcznik Użytkownika Pobierz pdf (Strona 47)

Chapter 4. SVA Path Installation 37

SVA Path Device Naming on HP-UX

Disk device filenames in HP-UX 10.x and higher have names in the

following format:

/dev/dsk/cXtYdZ

/dev/rdsk/cXtYdZ

The

controller instance number (X), the disk drive’s SCSI ID

number (Y)

and the SCSI LUN number (Z) can all be obtained from

the

I and the H/W Path columns of ioscan -fn:

In a typical, single-path disk storage system, each physical disk is

represented in the host’s

/dev directory by two special device files

representing the character and block mode device instances. For

simplicity, we will discuss this set of device files as a single device

filename and disregard the first part of the pathnames that

distinguish between raw and block modes.

As a layered driver that runs on top of the standard HP-UX disk

driver (

sdisk), SVA Path creates its own device files for devices,

and it is through these filenames that applications access the

underlying devices. When multiple paths to a single device are

present, so would multiple device files be present, one for each

path via the native disk driver. In these cases, which are typical of

# ioscan -fn

Class I H/W Path Driver S/W State H/W Type Description

========================================================================

bc 2 10 ccio CLAIMED BUS_NEXUS I/O Adapter

ext_bus 0 10/0 c720 CLAIMED INTERFACE GSC Fast/Wide SCSI Interface

target 0 10/0.1 tgt CLAIMED DEVICE

disk 13 10/0.1.0 sdisk CLAIMED DEVICE STK 9500

/dev/dsk/c0t1d0 /dev/rdsk/c0t1d0

disk 14 10/0.1.1 sdisk CLAIMED DEVICE STK 9500

/dev/dsk/c0t1d1 /dev/rdsk/c0t1d1

ext_bus 3 10/8 c720 CLAIMED INTERFACE GSC Fast/Wide SCSI Interface

target 5 10/8.0 tgt CLAIMED DEVICE

disk 5 10/8.0.0 sdisk CLAIMED DEVICE STK 9500

/dev/dsk/c3t0d0 /dev/rdsk/c3t0d0

disk 6 10/8.0.1 sdisk CLAIMED DEVICE STK 9500

/dev/dsk/c3t0d1 /dev/rdsk/c3t0d1

ba 0 10/12 bus_adapter CLAIMED BUS_NEXUS Core I/O Adapter

ext_bus 5 10/12/0 CentIf CLAIMED INTERFACE Built-in Parallel Interface

/dev/c5t0d0_lp

ext_bus 4 10/12/5 c720 CLAIMED INTERFACE Built-in SCSI

target 7 10/12/5.2 tgt CLAIMED DEVICE

disk 3 10/12/5.2.0 sdisk CLAIMED DEVICE TOSHIBA CD-ROM XM-4101TA

/dev/dsk/c4t2d0 /dev/rdsk/c4t2d0

1 2 ... 42 43 44 45 46 47 48 49 50 51 52 ... 67 68

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