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sg_unmap_example.txt
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# sg_unmap_example.txt # This is an example of the contents of a file that can be given to sg_unmap # For example, assume the /dev/sdc is a scratch disk (e.g. one made by the # scsi_debug kernel module) then: # sg_unmap --in=sg_unmap_example.txt /dev/sdc 0x12345677,1 # unmap LBA 0x12345677 0x12345678 2 # unmap LBA 0x12345678 and 0x12345679 0x12340000 3333 # unmap 3333 blocks starting at LBA 0x12340000 0X5a5a5a5a5a 0 # unmaps 0 blocks (i.e. does nothing) a5a5a5h 7 # unmap 7 blocks starting at LBA 0xa5a5a5 # Note that there can be leading and trailing whitespace and whitespace # (plus comma) can be a separator. # # Example invocation: # $ sg_unmap --in=../examples/sg_unmap_example.txt -vv /dev/sdc # open /dev/sg2 with flags=0x802 # unmap cdb: 42 00 00 00 00 00 00 00 58 00 # unmap parameter list: # 00 56 00 50 00 00 00 00 00 00 00 00 12 34 56 77 # 00 00 00 01 00 00 00 00 00 00 00 00 12 34 56 78 # 00 00 00 02 00 00 00 00 00 00 00 00 12 34 00 00 # 00 00 0d 05 00 00 00 00 00 00 00 5a 5a 5a 5a 5a # 00 00 00 00 00 00 00 00 00 00 00 00 00 a5 a5 a5 # 00 00 00 07 00 00 00 00 # sg_cmds_process_resp: slen=18 # unmap: Fixed format, current; Sense key: Illegal Request # Additional sense: Invalid command operation code # Raw sense data (in hex): # 70 00 05 00 00 00 00 0a 00 00 00 00 20 00 00 00 # 00 00 # UNMAP not supported # # -------------------------------------------------------- # Notice the 8 byte header then 5 descriptors in the parameter # list