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DMRAID(8)							     DMRAID(8)

       dmraid - discover, configure and activate software (ATA)RAID

	{-a|--activate} {y|n|yes|no}
	[-d|--debug]... [-v|--verbose]... [-i|--ignorelocking]
	[-f|--format FORMAT[,FORMAT...]]
	[{-P|--partchar} CHAR]
	[--separator SEPARATOR]

	[-d|--debug]... [-v|--verbose]...
	[--separator SEPARATOR]


	[-d|--debug]... [-v|--verbose]...

	[-d|--debug]... [-v|--verbose]... [-i|--ignorelocking]
	[-f|--format FORMAT[,FORMAT...]]
	[--separator SEPARATOR]

	{-R| --rebuild}

	{-x| --remove}

	-f FORMAT-handler {-C| --create} set
	--type raidlevel
	[--size=setsize --strip stridesize]
	--disk "device-path, device-path [, device-path ...]"

       dmraid  [  -f|--format FORMAT-handler] -S|--spare [RAID-set] -M|--media

	[-d|--debug]... [-v|--verbose]... [-i|--ignorelocking]
	[-f|--format FORMAT[,FORMAT...]]
	[--separator SEPARATOR]

	[-d|--debug]... [-v|--verbose]... [-i|--ignorelocking]
	[-f|--format FORMAT[,FORMAT...]]
	[--separator SEPARATOR]

	[-d|--debug]... [-v|--verbose]... [-i|--ignorelocking]
	[-f|--format FORMAT[,FORMAT...]]
	[--separator SEPARATOR]


       dmraid discovers block and software RAID devices (eg, ATARAID) by using
       multiple	 different metadata format handlers which support various for‐
       mats (eg, Highpoint 37x series).	 It offers activating RAID  sets  made
       up  by 2 or more discovered RAID devices, display properties of devices
       and sets (see option -l for supported metadata formats).	 Block	device
       access  to activated RAID sets occurs via device-mapper nodes /dev/map‐
       per/RaidSetName.	 RaidSetName starts  with  the	format	name  (see  -l
       option)	which can be used to access all RAID sets of a specific format
       easily with certain options (eg, -a below).

       -a, --activate {y|n} [RAID set...]
	      Activates or deactivates all or particular  software  RAID  set.
	      In  case metadata format handlers are chosen with -f , only RAID
	      sets with such format(s) can be activated or deactivated.	  Use‐
	      ful if devices have multiple metadata signatures.	 When activat‐
	      ing RAID sets, -p disables the activation of partitions on them,
	      and -Z will make dmraid tell the kernel to remove the partitions
	      from the disks underlying the set, ie if sda is part of the set,
	      remove   sda1,  sda2,  etc.   This  prevents  applications  from
	      directly accessiong the disks bypassing dmraid.  RAID set	 names
	      given  on	 command  line	don't  need to be fully specified (eg,
	      "dmraid -ay sil" would activate  all  discovered	Silicon	 Image
	      Medley RAID sets).

       {-b|--block_devices} [device-path...]
	      List all or particular discovered block devices with their prop‐
	      erties (size, serial number).  Add -c to	display	 block	device
	      names only and -cc for CSV column output of block device proper‐
	      ties.  See description of -c below for FIELD identifiers.

	      Enable debugging output.	Opion  can  be	given  multiple	 times
	      increasing the debug output level.

	      Display  properties  of  block devices, RAID sets and devices in
	      column(s).  Optional list specifying which FIELDs to display.
	      For -b:
	      d[evpath]|p[ath], sec[tors]|si[ze], ser[ialnumber].
	      For -r:
	      de[vpath]|p[ath],	 f[ormat],   r[aidname],   t[ype],   st[atus],
	      se[ctors]|si[ze], da[taoffset]|o[ffset].
	      For -s:
	      f[ormat],	    r[aidname],	    t[ype],	sta[tus],    str[ide],
	      se[ctors]|si[ze], su[bsets], d[evices], sp[ares].

       [-f|--format FORMAT[,FORMAT...]]
	      Use metadata format handler(s) to discover RAID devices.	See -l
	      for  a list of supported format handler names. This is useful to
	      select particular formats in case multiple  metadata  signatures
	      are  found  on  a device. A comma seperated list of format names
	      can be specified which may not contain white space.

	      Display help text.

	      Don't take  out  any  locks.  Useful  in	early  boot  where  no
	      read/write access to /var is available.

	      List all available metadata format handlers with their names and
	      descriptions. Supported RAID levels are listed in parenthesis:

	      S: Span (concatination)
	      0: RAID0 (stripe)
	      1: RAID1 (mirror)
	      10: RAID10 (mirror on top of stripes)
	      01: RAID10 (stripe on top of mirrors) Note: Intel OROM  displays
	      this as RAID10

       {-n|--native_log} [device-path...]
	      Display  metadata	 in native, vendor-specific format.  In case a
	      metadata format handler is chosen with -f only RAID devices with
	      such  format  will  be  displayed	 in native format.  If device-
	      path(s) is/are given on the command line, native metadata output
	      is restricted to those listed.

       [{-P|--partchar} CHAR]
	      Use CHAR as the separator between the device name and the parti‐
	      tion number.

       {-R| --rebuild} RAID-set [device-path]
	      Rebuild raid array after a drive has failed and a new  drive  is
	      added.   For  Intel chipset based systems, there are two methods
	      in which a new drive is added to the system.

	      1. Using OROM to identify a new drive
		  During system reboot, enter OROM and mark the new  drive  as
	      the rebuild drive.
		  After booting to the OS, use the dmraid command to rebuild.

		  Example: dmraid -R raid_set

	      2. Using dmraid to identify a new drive
		  Boot to the OS and use the dmraid command with the new drive
	      as the second parameter.

		  Example: dmraid -R raid_set /dev/sdc

	      3. Using hot spare drive
		  Mark a drive as hot spare using the "dmraid -f isw -S"  com‐
	      mand. Then use the dmraid command to start the rebuild.

		  Example: dmraid -R raid_set

       {-x|--remove} [RAID-set]
	      Delete  one or all existing software RAID devices from the meta‐

       -f  FORMAT-handler  {-C|--create}  --type   raidlevel   [--size=setsize
       --strip stripsize] --disk device-path, device-path [,device-path]
	      Delete one or all existing Configure a software RAID device  and
	      store the configuration data in a group of  hard	drive  devices
	      consisting  of  this  array. This command requires the following

	      -f FORMAT-handler
		   metadata format (see "dmraid -l")
	      --type digit[digit...]
		   specify the raid level of the software RAID set.
			0:  raid0
			1:  raid1
			5:  raid5
			01: raid01 (isw raid10)
	      --size: [digits[k|K|m|M|g|G][b|B]]
		   specify the size of the RAID set.The number is  an  integer
	      followed by [kKmMgG] and/or [bB].
			b: byte (default)
			B: block (512 bytes)
			K or K: on the base of 1024
			m or M: on the base of 1024*1024
			g or G: on the base of 1024*1024*1024
	      If  this	option	is missing, it's set to the default value pre-
	      configured by the vendor. Note that different vendors may	 apply
	      different constraints on the granularity of the size or the min‐
	      imal value.
	      --strip: [digits[k|K|m|M|g|G][b|B]]
		   specify the strip size of a RAID1, RAID5, and  RAID10  RAID
	      set (as above)
	      --disk: device-path[{,| }device-path...]
		   specify the array of the hard drives, e.g. /dev/sda.

       -f FORMAT-handler -S -M device-path
	      -S -M device-path

	      This command adds hot spare support for one or more RAID sets.

	      1.  When	used  with  a format handler, which supports hot spare
	      sets (e.g. isw), a hot spare is marked to be used when  rebuild‐
	      ing any RAID set of that format.	2. When used when specifying a
	      RAID set, the drive is added to that RAID set and will  be  used
	      only  to	rebuild that set. Note: If the specified name does not
	      match an existing RAID-set, a set with the new name will be cre‐

       {-r|--raid_devices} [device-path...]
	      List  all	 discovered RAID devices with format, RAID level, sec‐
	      tors used and data offset into the device.  In case  a  metadata
	      format  handler  is chosen with -f , only RAID devices with such
	      format can be discovered. Useful if devices have multiple	 meta‐
	      data  signatures.	  If  -D is added to -r the RAID metadata gets
	      dumped into a subdirectory named	dmraid.format_name  (eg.  for‐
	      mat_name	= isw) in files named devicename.dat.  The byte offset
	      where the metadata is located on	the  device  is	 written  into
	      files named devicename.offset and the size of the device in sec‐
	      tors into files named devicename.size.

	      If -E is added to -r the RAID metadata on the devices gets  con‐
	      ditionally  erased.   Useful to erase old metadata after new one
	      of different type has been stored on a device in order to	 avoid
	      discovering  both. If you enter -E option -D will be enforced in
	      order to have a fallback in case the wrong metadata got  erased.
	      Manual  copying  back  onto the device is needed to recover from
	      erasing the  wrong  metadata  using  the	dumped	files  device‐
	      name_formatname.dat  and	devicename_formatname.offset.	Eg, to
	      restore all *.dat files in the working directory to the  respec‐
	      tive devices:

	      for f in *.dat
		   dd if=$f of=/dev/${f%%.dat} \
		   seek=`cat ${f%%dat}offset` bs=1

	      If  device-path(s)  is/are  given on the command line, the above
	      actions are restricted to those listed.  Add -c to display  RAID
	      device  names  only and -cc for CSV column output of RAID device
	      properties.  See description of -c above for FIELD identifiers.

       --separator SEPARATOR
	      Use SEPARATOR as a delimiter for all options taking or  display‐
	      ing lists.

       -s... [a|i] [RAID-set...]
	      Display  properties of RAID sets. Multiple RAID set names can be
	      given on the command line which don't need to be fully specified
	      (eg, "dmraid -s hpt" would display all discovered Highpoint RAID
	      sets). Enter -s twice to display RAID subsets too.   Add	-c  to
	      display  names  of  RAID sets only, -cc for CSV column output of
	      RAID set properties and -ccc for inclusion of block  devices  in
	      the  listing.  Doesn't imply -s -s to show RAID subsets (implied
	      for group sets, e.g. isw).  Add -g to include information	 about
	      group  RAID  sets	 (as with Intel Software RAID) in the listing.
	      See description of -c above for FIELD identifiers.   Note:  Size
	      is given in sectors (not bytes).

	      Enable  verbose  runtime	information output. Opion can be given
	      multiple times increasing the verbosity level.

       "dmraid -l" lists all supported metadata formats with their names along
       with some descriptive information, eg:
       hpt37x : (+) Highpoint HPT37X
       hpt45x : (+) Highpoint HPT45X
       isw    : (+) Intel Software RAID
       lsi    : (0) LSI Logic MegaRAID
       nvidia : (+) NVidia RAID
       pdc    : (+) Promise FastTrack
       sil    : (+) Silicon Image(tm) Medley(tm)
       via    : (+) VIA Software RAID
       dos    : (+) DOS partitions on SW RAIDs
       (0): Discover, (+): Discover+Activate

       "dmraid -ay" activates all software RAID sets discovered.

       "dmraid	-an"  deactivates  all active software RAID sets which are not
       open (eg, mounted filesystem on them).

       "dmraid -ay -f pdc" (pdc looked up  from	 "dmraid  -l")	activates  all
       software RAID sets with Promise format discovered and ignores all other
       supported formats.

       "dmraid -r" discovers all software RAID devices supported on your  sys‐
       tem, eg:
       /dev/dm-46:  hpt45x, "hpt45x_chidjhaiaa-0", striped, ok, 320172928 sec‐
       tors, data@ 0
       /dev/dm-50: hpt45x, "hpt45x_chidjhaiaa-0", striped, ok, 320172928  sec‐
       tors, data@ 0
       /dev/dm-54:  hpt45x, "hpt45x_chidjhaiaa-1", striped, ok, 320172928 sec‐
       tors, data@ 0
       /dev/dm-58: hpt45x, "hpt45x_chidjhaiaa-1", striped, ok, 320172928  sec‐
       tors, data@ 0

       "dmraid	 -s   -s   hpt45x_chidjhaiaa"	displays   properties  of  set
       "hpt45x_chidjhaiaa", eg:
       *** Superset
       name   : hpt45x_chidjhaiaa
       size   : 640345856
       stride : 128
       type   : raid10
       status : ok
       subsets: 2
       dev    : 4
       spare  : 0
       ---> Subset
       name   : hpt45x_chidjhaiaa-0
       size   : 640345856
       stride : 128
       type   : stripe
       status : ok
       subsets: 0
       dev    : 2
       spare  : 0
       ---> Subset
       name   : hpt45x_chidjhaiaa-1
       size   : 640345856
       stride : 128
       type   : stripe
       status : ok
       subsets: 0
       dev    : 2
       spare  : 0

       "dmraid -s -ccs hpt45" displays properties in column format of all sets
       and subsets with hpt45* format, eg:

       "dmraid	-r --sep : -cpath:size" display paths and sizes in sectors for
       RAID devices in column format using ':' as a delimiter, eg:

       "dmraid -f isw -C Raid0 --type 0 --strip 8k --size 20g --disk "/dev/sdb
       /dev/sdc"" creates an ISW volume with a name of "Raid0", 20Gig bytes in
       total, and 8kilo bytes strip size on two disks.

       "dmraid -f isw -C Test0 --type 0 --disk "/dev/sdd /dev/sde"" creates an
       ISW volume with the default size and strip size.

       "dmraid	-f  isw	 -C  Test10  --type  01	 --strip 128B --disk "/dev/sda
       /dev/sdb /dev/sdc /dev/sdd" creates a stacked RAID device, RAID10  (isw
       format),	 with  a  name of "Test10", 128 blocks (512bytes) strip size ,
       and the default volume size on 4 disks.

       "dmraid -f isw -S -M /dev/sde" marks the device /dev/sde as a hot spare
       for rebuild

       "dmraid	-R  isw_djaggchdde_RAID1  /dev/sde" starts rebuild of the RAID
       volume on device /dev/sde

       dmraid returns an exit code of 0 for success or 1 for error.

       Heinz Mauelshagen <>

Heinz Mauelshagen		  DMRAID TOOL			     DMRAID(8)

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