EMC Qlogic QLA22xx Guía de instalación descargar pdf (Pagina 70)

Symmetrix Fibre Channel with Qlogic HBAs on Linux Hosts

Fabric Configurations

Incorporating

Symmetrix Fibre

Channel

Once the Symmetrix has devices assigned with device addresses and

the directors have been switched on line, the host can see all the

target Symmetrix devices assigned to that host interface. Devices are

presented to the host in the same manner as devices accessed through

a standard SCSI interface.

Partitioning and

Labeling a New

Device

Block device filenames take the form /dev/sdln, where l is the letter

denoting the physical drive and n is the number denoting the

partition on that physical drive. Usually, the partition number is not

included when the device corresponds to the entire drive.

Following this format, the filenames would appear as follows:

/dev/sd[a-d][a-z][1-15]

Linux supports a total of 128 SCSI devices per system. As a result, the

host could support disk devices from /dev/sda through /dev/sddx.

Linux supports one to 15 partitions per disk device. Partitions 1

through 4 are the primary partitions, while partitions 5 and greater

are the logical or extended partitions. (These limitations are specific

to the Intel platform.) By default, slices are not used in Linux.

True raw devices have not yet been incorporated into the kernel.

The corresponding character device filenames take the form

/dev/sg[a-d][a-z], where sg is one of four high-level device drivers in

the SCSI subsystem.

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.

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EMC Qlogic QLA22xx Guía de instalación Pagina 70