Chelsio Communications Terminator Series Installation And User Manual page 175

Chapter X. iSCSI PDU Offload Target
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.
"SYNC" can be used with FILE mode to make sure the data is flushed to the storage device
before the Target responds back to the Initiator.
To configure a FILE storage device specify
TargetDevice=<path to the storage device>[,FILE][,SYNC]
<path>
Where:
SYNC
Example Configuration of FILE Mode Storage
Below is an example:
target:
#<snip>
# software raid /dev/md0 is accessed in FILE mode
TargetDevice=/dev/md0,FILE
#<snip>
BLK Mode Storage Device Details
The BLK mode storage device is suitable for high-speed storage attached to the target system:
•
The BLK mode can accommodate only 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.
To configure a block storage device specify BLK as the device mode:
Chelsio Unified Wire for Linux
FILE
Is the path to the actual storage device, such as /dev/sdb for a block
device or /dev/md0 for a software RAID. The path must exist in the
system.
When specified, the Target will flush all the data in the system cache to
the storage driver before sending response back to the Initiator.
as the device mode:
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