aboutsummaryrefslogtreecommitdiff
path: root/Documentation/README.DAC960
diff options
context:
space:
mode:
authorNeilBrown <neilb@suse.de>2006-06-26 00:27:58 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-06-26 09:58:39 -0700
commit9e653b6342c94016f5cc9937061ef99e9c4b4045 (patch)
treeec6d984d1c6142a59a70308af511c3244276a8e5 /Documentation/README.DAC960
parent42543769142d2375f2b5f8fc9cac999f84bd4c4c (diff)
[PATCH] md: Set/get state of array via sysfs
This allows the state of an md/array to be directly controlled via sysfs and adds the ability to stop and array without tearing it down. Array states/settings: clear No devices, no size, no level Equivalent to STOP_ARRAY ioctl inactive May have some settings, but array is not active all IO results in error When written, doesn't tear down array, but just stops it suspended (not supported yet) All IO requests will block. The array can be reconfigured. Writing this, if accepted, will block until array is quiescent readonly no resync can happen. no superblocks get written. write requests fail read-auto like readonly, but behaves like 'clean' on a write request. clean - no pending writes, but otherwise active. When written to inactive array, starts without resync If a write request arrives then if metadata is known, mark 'dirty' and switch to 'active'. if not known, block and switch to write-pending If written to an active array that has pending writes, then fails. active fully active: IO and resync can be happening. When written to inactive array, starts with resync write-pending (not supported yet) clean, but writes are blocked waiting for 'active' to be written. active-idle like active, but no writes have been seen for a while (100msec). Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'Documentation/README.DAC960')
0 files changed, 0 insertions, 0 deletions