Emulex LightPulse LPe1105-M4 HBA Installation Guide download pdf (Page 154)

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EMC Host Connectivity with Emulex FC HBAs and FCoE CNAs for the Linux Environment

Additional Notes

Device reconfiguration: Device numbering

In the Linux v2.6.x kernel, SCSI addresses are not used in the device

file names as they are in other types of UNIX (Sun, SGI, HP-UX, and

BSD, for example). Block device filenames take the form

/dev/sd

where

is the letter denoting the physical drive and

is the number

denoting the partition on that physical drive. Disk device file names

and major and minor numbers are assigned dynamically at boot time

or device loading time in the order of discovery.

Depending upon the hardware configuration, if a device is added

and the system rebooted, the device numbering might change,

possibly rendering the host's mount table inaccurate. For the most

consistent results and to reduce the possibility of mount table

inaccuracies, new devices should be appended (if possible) to the list

of already attached devices. For example, if the host contains multiple

adapters, it is best to append the new device to the last adapter and to

the end of the device list attached to that adapter. This would

eliminate the need to alter the preexisting entries in the mount table,

since the new device could be appended to that as well.

If a new device were added to the first out of two adapters and the

system rebooted, the device file names will shift by one number and

the mount table entries will also shift by one device file name. If there

is only one adapter, the new device can more easily be appended to

the list of the regularly attached devices and the mount table altered

accordingly.

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Emulex LightPulse LPe1105-M4 HBA Installation Guide Page 154