View source for linux kernel configuration for software raid




== Check for support ==

If your system has RAID support, you should have a file called /proc/mdstat. If you do not have that file, maybe your kernel does not have RAID support. 

Also, gentoo & archlinux users can run...
 # zcat /proc/config.gz |grep CONFIG_BLK_DEV_MD
 CONFIG_BLK_DEV_MD=y

And
 # zcat /proc/config.gz |grep MD_RAID 
 CONFIG_MD_RAID0=y
 CONFIG_MD_RAID1=y
 CONFIG_MD_RAID10=y
 CONFIG_MD_RAID456=y


== menuconfig / kconfig info ==

We assume you know how to configure your kernel.  This section details the specific,minimum menuconfig options for basic software raid functionality.  Refernce you distro's documentation for kernel configuration if needed.  For general info on configuring linux kernels, archlinux has a good guide here...
[https://wiki.archlinux.org/index.php/Kernels/Compilation/Traditional Kernels/Compilation/Traditional]

'''Multiple devices driver support (required)'''

 Symbol: BLK_DEV_MD [=y]  
 Type  : tristate  
 Prompt: RAID support  
   Location:  
     -> Device Drivers  
 (1)   -> Multiple devices driver support (RAID and LVM) (MD [=y])  
   Defined at drivers/md/Kconfig:14  
   Depends on: MD [=y]  
   Selected by: DM_RAID [=m] && MD [=y] && BLK_DEV_DM [=m]

Help text:

Support multiple physical spindles through a single logical device.  Required for RAID and logical volume management.


== at least of of the following required ==

Enable all or one of the options below depending on what kind of raid you plan to do.

 Symbol: MD_RAID1 [=y]  
 Type  : tristate  
 Prompt: RAID-1 (mirroring) mode  
   Location:  
     -> Device Drivers  
       -> Multiple devices driver support (RAID and LVM) (MD [=y])  
 (2)     -> RAID support (BLK_DEV_MD [=y])  
   Defined at drivers/md/Kconfig:80  
   Depends on: MD [=y] && BLK_DEV_MD [=y]  
   Selected by: DM_RAID [=m] && MD [=y] && BLK_DEV_DM [=m]  
  
  
 Symbol: MD_RAID0 [=y]  
 Type  : tristate  
 Prompt: RAID-0 (striping) mode  
   Location:  
     -> Device Drivers  
       -> Multiple devices driver support (RAID and LVM) (MD [=y])  
 (3)     -> RAID support (BLK_DEV_MD [=y])  
   Defined at drivers/md/Kconfig:60  
   Depends on: MD [=y] && BLK_DEV_MD [=y]  
  

 Symbol: MD_RAID456 [=y]  
 Type  : tristate  
 Prompt: RAID-4/RAID-5/RAID-6 mode  
    Location:  
      -> Device Drivers  
        -> Multiple devices driver support (RAID and LVM) (MD [=y])  
          -> RAID support (BLK_DEV_MD [=y])  
    Defined at drivers/md/Kconfig:121  
    Depends on: MD [=y] && BLK_DEV_MD [=y]  
    Selects: RAID6_PQ [=y] && ASYNC_MEMCPY [=y] && ASYNC_XOR [=y] && ASYNC_PQ [=y] && ASYNC_RAID6_RECOV [=y]  
    Selected by: DM_RAID [=m] && MD [=y] && BLK_DEV_DM [=m]

 Symbol: MD_RAID10 [=y]  
 Type  : tristate  
 Prompt: RAID-10 (mirrored striping) mode  
   Location:  
     -> Device Drivers  
       -> Multiple devices driver support (RAID and LVM) (MD [=y])  
 (4)     -> RAID support (BLK_DEV_MD [=y])  
   Defined at drivers/md/Kconfig:102  
   Depends on: MD [=y] && BLK_DEV_MD [=y]  
   Selected by: DM_RAID [=m] && MD [=y] && BLK_DEV_DM [=m]

== Links ==
this guide is recommended by the linux kernel help...
[[http://www.tldp.org/HOWTO/html_single/Software-RAID-HOWTO/ Software RAID HOWTO]]


[[category:raid]]
[[category:gentoo]]