Lines Matching +full:d +full:- +full:cache +full:- +full:block +full:- +full:size
5 ---------------------------------
16 md=<md device no.>,<raid level>,<chunk size factor>,<fault level>,dev0,dev1,...,devn
24 md=d<md device no.>,dev0,dev1,...,devn
49 -1 linear mode
55 ``chunk size factor``
58 (raid-0 and raid-1 only)
60 Set the chunk size as 4k << n.
78 --------------------------------------
87 that all auto-detected arrays are assembled as partitionable.
90 -------------------------------------------
102 mdadm --assemble --force ....
112 md-mod.start_dirty_degraded=1
116 ------------------
119 Currently, it supports superblock formats ``0.90.0`` and the ``md-1`` format
125 reasons - it is the original superblock format.
128 General Rules - apply for all superblock formats
129 ------------------------------------------------
138 An array should be created by a user-space tool. This will write
165 Specific Rules that apply to format-0 super block arrays, and arrays with no superblock (non-persis…
166 ---------------------------------------------------------------------------------------------------…
181 -------------------
183 md devices appear in sysfs (``/sys``) as regular block devices,
186 /sys/block/md0
189 contains further md-specific information about the device.
210 reduce the size of the array. To reduce the number of drives
211 in an e.g. raid5, the array size must first be reduced by
215 This is the size in bytes for ``chunks`` and is only relevant to
219 The size should be at least PAGE_SIZE (4k) and should be a power
231 the available size will set the size. Any reconfiguration of the
232 array (e.g. adding devices) will not cause the size to change.
233 Writing the word ``default`` will cause the effective size of the
234 array to be whatever size is actually available based on
237 This can be used to reduce the size of the array before reducing
255 multipath), all components must be the same size - or at least
256 there must a size that they all provide space for. This is a key
268 is set by user-space. This indicates that metadata is managed
269 by a user-space program. Any device failure or other event that
275 this will be a very large number (or ``none`` since 2.6.30-rc1). At
281 be a block device number as major:minor. e.g. 8:0
283 available. It will then appear at md/dev-XXX (depending on the
303 very interesting) are notified. active->active_idle is
307 No devices, no size, no level
318 All IO requests will block. The array can be reconfigured.
320 Writing this, if accepted, will block until array is quiescent
327 read-auto
337 if not known, block and switch to write-pending
344 write-pending
347 active-idle
351 This indicates where the write-intent bitmap for the array is
354 It can be one of ``none``, ``file`` or ``[+-]N``.
356 ``[+-]N`` means that many sectors from the start of the metadata.
363 The size, in bytes, of the chunk which will be represented by a
372 are known to be in-sync.
375 When write-mostly devices are active in a RAID1, write requests
376 to those devices proceed in the background - the filesystem (or
397 to be in-sync. If ``false``, bits will never be cleared.
401 once the array becomes non-degraded, and this fact has been
416 Resync assisted by a write-intent bitmap.
431 xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
437 dev-XXX
442 block
443 a symlink to the block device in /sys/block, e.g.::
445 /sys/block/md0/md/dev-hdb1/block -> ../../../../block/hdb/hdb1
461 device is a fully in-sync member of the array
505 Writing ``-writemostly`` clears the writemostly flag.
509 Writing ``-blocked`` clears the ``blocked`` flags and allows writes
516 Writing ``-write_error`` clears writeerrorseen flag.
521 Writing ``-want_replacement`` is allowed at any time. It clears
524 Writing ``replacement`` or ``-replacement`` is only allowed before
535 happened while the array was read-only). When using version-1
556 size
587 This gives the list of known-but-not-yet-saved-to-disk bad
594 Location and size (in sectors) of the space used for Partial Parity Log
605 These are symbolic links to the appropriate ``dev-XXX`` entry.
608 cat /sys/block/md*/md/rd*/state
640 user, and the write-intent bitmap is NOT used to
675 that were re-written, or (for ``check``) would have been
676 re-written. As most raid levels work in units of pages rather
681 If the array has a write-intent bitmap, then writing to this
684 numbers or start-end pairs can be written. Multiple numbers
687 Note that the numbers are ``bit`` numbers, not ``block`` numbers.
695 is written, then the system-wide value is used. If a value,
696 in kibibytes-per-second is written, then it is used.
700 a locally set or system-wide value.
746 number of entries in the stripe cache. This is writable, but
750 number of active entries in the stripe cache
756 requires preread stripes to wait until all full-width stripe-
760 The cache mode for raid5. raid5 could include an extra disk for
761 caching. The mode can be "write-throuth" and "write-back". The
762 default is "write-through".