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RedHat 9 (Linux i386) - man page for raidreconf (redhat section 8)

raidreconf(8)			     System Manager's Manual			    raidreconf(8)

       raidreconf - reconfigure RAID arrays

       raidreconf -h {--help}

       - or -

       raidreconf -V {--version}

       - or -

       raidreconf -o oldraidtab -n newraidtab -m /dev/md?

       - or -

       raidreconf -i /dev/sd?? -n newraidtab -m /dev/md?

       - or -

       raidreconf -n newraidtab -m /dev/md? -e /dev/sd??

       You  should back up all data BEFORE any attempt is made to reconfigure a RAID device.  YOU

       The author will give you no guarantee whatsoever, that this program works in any  specific
       way  at all. It may well destroy all data on any device connected directly, indirectly, or
       not at all, to any system this software is used on.  Please use this stuff with	care,  if
       you decide to use it at all.

       Ok, that said, let's see how to actually use it	:-)

       raidreconf  will read two raidtab files, an old one, and a new one.  It will then re-build
       your old array to match the configuration for the new array, while retaining all data pos-

       It  can	also  be used to import a single block-device into a RAID array (using more block
       devices), or export a RAID array to a single block-device.

       raidreconf can, of course, only retain your original data if you grow  the  configuration.
       If  you	shrink the configuration from say, P bytes to Q bytes, raidreconf will retain the
       first Q bytes of your original data, but everything from Q bytes to the	end  of  the  old
       array (to P bytes) will be lost.

       Currently  raidreconf  can  grow  and shrink RAID-0 and RAID-5 arrays, and import non-RAID
       devices into a new RAID-0 or RAID-5.

       The whole purpose of raidreconf is to be able to add disks to an existing array,  or  con-
       vert it to a new type (eg. RAID-0 to RAID-5) without losing data. raidreconf will move the
       existing data around on your array, to match the layout of the new array.

       -h {--help}
	      Raidreconf will print a short help message, and exit.

       -V {--verbose}
	      Raidreconf will print it's version information, and exit.

       -o {--old} oldraidtab
	      Specifies the path name of the old (current) raidtab.   NOTE:  raidreconf  performs
	      some  tests  to  ensure  that  this configuration file matches the raid superblocks
	      stored on the disk, but there may be scenarios where the two are in  conflict,  but
	      aren't detected as such.	Be very careful to specify this file properly.

       -n {--new} newraidtab
	      Specifies  the  path  name of the new raidtab.  After raidreconf finishes, copy the
	      newraidtab to the oldraidtab location, as raidreconf doesn't perform  this  (poten-
	      tially dangerous) operation.

       -m {--mddev} /dev/md?
	      Specifies the name of the raid array to modify.

       -i {--import} /dev/sd??
	      Specifies the name of the device to import from.

       -e {--export} /dev/sd??
	      Specifies the name of the device to export to.

       Perhaps	many.	Well, the basic RAID-0 growth, shrink and import algorithms seem to work,
       but there are lots and lots of consistency checks and graceful error handling missing.

       The RAID-5 algorithms are simplistic, with little optimization other than that provided by
       the  buffer  layer.   Conversions between non-RAID, RAID-0, and RAID-5 all *seem* to work,
       but there may be some bugs left yet.

       If an error occurs during reconfiguration, a  power  failure  for  example,  restore  from
       backup (you DID make a backup, right?), and try again.

       Although RAID-4 is not supported, and almost no one uses it, it would be almost trivial to

       Since this is highly experimental software, there are a number of known bugs already.  The
       author  would  of  course  like	to  know about bugs, but at this stage in development you
       shouldn't waste too much of your time trying to hunt them down.	They're  probably  known,
       and maybe already fixed in the author's tree.

       Report bugs to <bugs@oss.connex.com>. ?????

       raidreconf was written in 1999 by Jakob Oestergaard <jakob@ostenfeld.dk>

       The RAID-5 routines were written by Daniel S. Cox in 2001 <dcox@connex.com>

       mkraid(8), raidtab(5), raidstart(8), raidhotadd(8), raidhotremove(8), raidstop(8)


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