Chelsio Communications Chelsio T4 Guía de usuario descargar pdf (Pagina 119)

Chapter VII. iSCSI PDU Offload Target

When option NULLRW is specified, on writes the data is dropped without being copied to the

storage device, and on reads the data is not actually read from the storage device but instead

random data is used. This option is usefuly for measuring network performance.

The details of the parameters for the key TargetDevice are found in the table of Chelsio Entity

Settings section earlier in this document.

4.7.1. RAM Disk Details

For the built-in RAM disk:

The minimum size of the RAM disk is 1 Megabyte (MB) and the maximum is limited by

system memory.

To use a RAM disk with a Windows Initiator, it is recommended to set the size >= 16MB.

To configure an ramdisk specify MEM as the device mode:

TargetDevice=<name>,MEM,size=xMB

Where:

<name>

Is a unique name given to the RAM Disk. This name identifies this

particular ramdisk. If multiple RAM Disks are configured for the same

target, the name must be unique for each RAM Disk.

              - max,

where max is limited by system memory. If this value is not specified the

default value is 16 MB.

target:

#<snip>

# 16 Megabytes RAM Disk named ramdisk1

TargetDevice=ramdisk1,MEM,size=16MB

#<snip>

4.7.2. FILE Mode Storage Device Details

The FILE mode storage device is the most common and versatile mode to access the actual

storage attached to the target system:

The FILE mode can accommodate both block devices and virtual block devices.

The device is accessed in the exclusive mode. The device should not be accessed (or

active) in any way on the target system.

Each device should be used for one and only one iSCSI target.



before the Target responds back to the Initiator.

To configure a FILE storage device specify FILE as the device mode:

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Chelsio Communications Chelsio T4 Guía de usuario Pagina 119