diff options
Diffstat (limited to 'Documentation/admin-guide/device-mapper/dm-dust.rst')
| -rw-r--r-- | Documentation/admin-guide/device-mapper/dm-dust.rst | 32 |
1 files changed, 25 insertions, 7 deletions
diff --git a/Documentation/admin-guide/device-mapper/dm-dust.rst b/Documentation/admin-guide/device-mapper/dm-dust.rst index b6e7e7ead831..e35ec8cd2f88 100644 --- a/Documentation/admin-guide/device-mapper/dm-dust.rst +++ b/Documentation/admin-guide/device-mapper/dm-dust.rst @@ -69,10 +69,11 @@ Create the dm-dust device: $ sudo dmsetup create dust1 --table '0 33552384 dust /dev/vdb1 0 4096' Check the status of the read behavior ("bypass" indicates that all I/O -will be passed through to the underlying device):: +will be passed through to the underlying device; "verbose" indicates that +bad block additions, removals, and remaps will be verbosely logged):: $ sudo dmsetup status dust1 - 0 33552384 dust 252:17 bypass + 0 33552384 dust 252:17 bypass verbose $ sudo dd if=/dev/mapper/dust1 of=/dev/null bs=512 count=128 iflag=direct 128+0 records in @@ -164,7 +165,7 @@ following message command:: A message will print with the number of bad blocks currently configured on the device:: - kernel: device-mapper: dust: countbadblocks: 895 badblock(s) found + countbadblocks: 895 badblock(s) found Querying for specific bad blocks -------------------------------- @@ -176,11 +177,11 @@ following message command:: The following message will print if the block is in the list:: - device-mapper: dust: queryblock: block 72 found in badblocklist + dust_query_block: block 72 found in badblocklist The following message will print if the block is not in the list:: - device-mapper: dust: queryblock: block 72 not found in badblocklist + dust_query_block: block 72 not found in badblocklist The "queryblock" message command will work in both the "enabled" and "disabled" modes, allowing the verification of whether a block @@ -198,12 +199,28 @@ following message command:: After clearing the bad block list, the following message will appear:: - kernel: device-mapper: dust: clearbadblocks: badblocks cleared + dust_clear_badblocks: badblocks cleared If there were no bad blocks to clear, the following message will appear:: - kernel: device-mapper: dust: clearbadblocks: no badblocks found + dust_clear_badblocks: no badblocks found + +Listing the bad block list +-------------------------- + +To list all bad blocks in the bad block list (using an example device +with blocks 1 and 2 in the bad block list), run the following message +command:: + + $ sudo dmsetup message dust1 0 listbadblocks + 1 + 2 + +If there are no bad blocks in the bad block list, the command will +execute with no output:: + + $ sudo dmsetup message dust1 0 listbadblocks Message commands list --------------------- @@ -223,6 +240,7 @@ Single argument message commands:: countbadblocks clearbadblocks + listbadblocks disable enable quiet |