What is the correct scsi pass thru to get the >2 TB disk capacity?

[Masthan]

Hi All,

I connected a 2097151 MB LUN to my RHEL4 x86 machine. To get a disk capacity my application uses scsi pass thrus. I want to know the right scsi pass thru command to get the >2 TB LUN capacity. Actually I tried with scsi passthru "Read Capacity (16)" command but no luck. I am getting the following error with "Read Capacity (16)" command.

Read Capacity (16) failed on /dev/sdq!
Sense Key = 5 = ILLEGAL REQUEST, Sense Code/Qualifier = (0x24, 0)
Request Sense Data:
Error code ...................... : 0x70 = Current Error
Information fields valid ........ : No
Segment number .................. : 0x0
Sense Key ....................... : 0x5 = ILLEGAL REQUEST
Information byte 3 .............. : 0x0
Information byte 2 .............. : 0x0
Information byte 1 .............. : 0x0
Information byte 0 .............. : 0x0
Additional sense length ......... : 0x58
Command information byte 3 ...... : 0x0
Command information byte 2 ...... : 0x0
Command information byte 1 ...... : 0x0
Command information byte 0 ...... : 0x0
Additional sense code/qualifier . : (0x24, 0)
Field replaceable unit code ..... : 0x0
Additional sense bytes .......... : 0x0 0x0 0x0 0x9e 0x80 0xd4 0x28 0xd4

Your help is appreciated.

Regards
Masthan D