The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)

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FreeBSD/Linux Kernel Cross Reference
sys/Documentation/md.txt

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    1 Tools that manage md devices can be found at
    2    http://www.<country>.kernel.org/pub/linux/daemons/raid/....
    3 
    4 
    5 
    6 You can boot (if you selected boot support in the configuration) with your md 
    7 device with the following kernel command lines:
    8 
    9 for old raid arrays without persistent superblocks:
   10   md=<md device no.>,<raid level>,<chunk size factor>,<fault level>,dev0,dev1,...,devn
   11 
   12 for raid arrays with persistant superblocks
   13   md=<md device no.>,dev0,dev1,...,devn
   14   
   15 md device no. = the number of the md device ... 
   16               0 means md0, 
   17               1 md1,
   18               2 md2,
   19               3 md3,
   20               4 md4
   21 
   22 raid level = -1 linear mode
   23               0 striped mode
   24               other modes are only supported with persistant super blocks
   25 
   26 chunk size factor = (raid-0 and raid-1 only)
   27               Set  the chunk size as 4k << n.
   28               
   29 fault level = totally ignored
   30                             
   31 dev0-devn: e.g. /dev/hda1,/dev/hdc1,/dev/sda1,/dev/sdb1
   32                             
   33 A possible loadlin line (Harald Hoyer <HarryH@Royal.Net>)  looks like this:
   34 
   35 e:\loadlin\loadlin e:\zimage root=/dev/md0 md=0,0,4,0,/dev/hdb2,/dev/hdc3 ro
   36

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