EMC Qlogic QLA22xx Guía de instalación descargar pdf (Pagina 33)

Symmetrix Fibre Channel with Qlogic HBAs on Linux Hosts

Arbitrated Loop Configurations

The four high-level device drivers are:

sg (SCSI generic interface)

sd (direct access; disks, for example)

st (tapes)

sr (data CD-ROMs)

The sg driver is a character-based device, while the other three

drivers are block-based devices. sg is used primarily for scanners, CD

writers, printers, and raw access, although sg is not a true raw device.

The sg device files are dynamically mapped to SCSI IDs/LUNs on the

SCSI bus, starting with the first SCSI controller.

The Linux kernel assigns minor SCSI device numbers dynamically by

assigning them only to devices that are actually connected to the host in the

order of their SCSI IDs. This means that connecting an external SCSI device

can change the minor numbers of all the internal SCSI devices with a higher

SCSI ID.

Partitioning Symmetrix

Devices

Once the QLogic driver is loaded, the Symmetrix devices will be

represented in /proc/scsi/scsi. They can be viewed by using more

/proc/scsi/scsi. Only /dev/sda through /dev/sdp and /dev/sga through

/dev/sgh will be created by default upon kernel compilation. In order

to create subsequent device files for the Symmetrix devices attached

to the host, the root user will need to create them via the mknod

command.

Using the fdisk command allows multiple partitions to reside on a

single disk device.

To partition one or more Symmetrix devices for the use of Linux, log

in as root and follow the procedure below:

1. Type

fdisk /dev/sdb ENTER.

2. If you want to display a list of options, type

m ENTER (for help) to

display the following:

Command action

a toggle a bootable flag

b edit bsd disklabel

c toggle the DOS compatibility flag

d delete a partition

l list known partition types

m print this menu

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EMC Qlogic QLA22xx Guía de instalación Pagina 33