Understanding max_sectors

[Stefan Gourguis <brockz@xxxxxxxxxxxx>]

Hello target_devel List

I am a very great Fan and Tester of Lio-Target since 2 Years. Keep on you great working on this!

Actually i have compiled the lio-core git commit dd9604b1a2558f4c7b8c9f29d0d7cd92ed74ff3e from 13.03.2012.
I run in big Problems with the new(?) max_sectors Feature. Becaus lio rounding down my Sectors on an HD with 120GB. What is my Problem here ?
Ive added the Disk via targetcli to an iblock backstore. My old compiles of lio-core from last Year working fine.

Here are my Logs:


The Disk

root@winglet2k:/usr/local/src/lio-core-2.6# fdisk -l /dev/cciss/c0d1

Disk /dev/cciss/c0d1: 146.8 GB, 146778685440 bytes
255 heads, 32 sectors/track, 35132 cylinders
Units = cylinders of 8160 * 512 = 4177920 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xdf00a009

           Device Boot      Start         End      Blocks   Id  System





targetcli Attributes Output (no attributes modified) of the the whole disk (iblock/testdisk) (/dev/cciss/c0d1)

/backstores/iblock/testdisk> get attribute
ATTRIBUTE CONFIG GROUP
  block_size=512
    The block_size attribute.

  emulate_dpo=0
    The emulate_dpo attribute.

  emulate_fua_read=0
    The emulate_fua_read attribute.

  emulate_fua_write=1
    The emulate_fua_write attribute.

  emulate_rest_reord=0
    The emulate_rest_reord attribute.

  emulate_tas=1
    The emulate_tas attribute.

  emulate_tpu=0
    The emulate_tpu attribute.

  emulate_tpws=0
    The emulate_tpws attribute.

  emulate_ua_intlck_ctrl=0
    The emulate_ua_intlck_ctrl attribute.

  emulate_write_cache=0
    The emulate_write_cache attribute.

  enforce_pr_isids=1
    The enforce_pr_isids attribute.

  fabric_max_sectors=8192
    The fabric_max_sectors attribute.

  hw_block_size=512 [ro]
    The hw_block_size attribute.

  hw_max_sectors=4294967295 [ro]
    The hw_max_sectors attribute.

  hw_queue_depth=128 [ro]
    The hw_queue_depth attribute.

  is_nonrot=0
    The is_nonrot attribute.

  max_sectors=8388600
    The max_sectors attribute.

  max_unmap_block_desc_count=0
    The max_unmap_block_desc_count attribute.

  max_unmap_lba_count=0
    The max_unmap_lba_count attribute.

  optimal_sectors=8192
    The optimal_sectors attribute.

  queue_depth=128
    The queue_depth attribute.

  unmap_granularity=0
    The unmap_granularity attribute.

  unmap_granularity_alignment=0
    The unmap_granularity_alignment attribute.


And also my relevant demsg output:
[ 1936.317399] Rounding down aligned max_sectors from 4294967295 to 8388600



Thank you for this great Piece of Software/Kernel Module

Stefan Gourguis
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