Howto: implement AMD SB9xx RAID5 support in dmraid

Thu Apr 12 23:23:43 UTC 2012

Hi,

Been playing with the patches you gave me. And I finally got the raid up and running, using the shipped dm-raid.ko module in the 3.2 kernel.

Lets go through the steps.

I have applied the dmraid_pdc_raid5.patch, this caused dmraid to produce a new error related to the missing dm-raid45 module. Before activating a new raid set  dmraid checks if a dm-target has been registered with device-mapper. This can be changed through a struct in metadata.c. Doing this accordingly only left me with the error of raid array not activated. Going through the dmesg I found that dmraid was giving a wrong raid type to the dm-raid module. Digging deeper I wound that the arguments given to dm-raid45 and dm-raid have a different structure. So I have changed the arguments structure send to the module accordingly.

$ dmraid -ay -t
pdc_ciihdaafgf: 0 1953124864 raid raid5_la 2 128 nosync 3 - /dev/sdb - /dev/sdc - /dev/sdd

this used to be something like (I forgot some numbers)
$ dmraid -ay -t

pdc_ciihdaafgf: 0 1953124864 raid core 2 132016 nosync raid5_la 1 128 3 -1 /dev/sdb 0 /dev/sdc 0 /dev/sdd 0

The patch has been attached. (see that I have made some typo's in naming the patch.)

Now I can activate the raid and by using kpartx I can also mount the partitions on the raid. Whoot.

Unfortunately the fix was a bit dirty, could be that I have broken dmraid for the other raid types. Also I am not sure if you need to send the region_size to the dm-raid module.

Regards,

Mark-Willem

Date: Tue, 3 Apr 2012 11:13:20 +0400
From: astarta at rat.ru
To: markwillem at hotmail.com
CC: ataraid-list at redhat.com
Subject: Re: Howto: implement AMD SB9xx RAID5 support in dmraid

    Hello,

    I do have dm-raid45 patch for 3.2. 

    I do not remember where it was taken from, but it compiles with 3.2
    :-)

    On 04/03/2012 11:13 AM, Mark-Willem Jansen wrote:

        Hello,

        Later this day I will apply the patch. But patching the kernel
        will be more cumbersome. The 

        present kernel running om my system is 3.2.0 and the patches
        found on the web are for 

        older kernels. But maybe the module dm-raid.ko included in the
        kernel can be helpful.

        Regards,

        Mark-Willem

        > Date: Mon, 2 Apr 2012 17:42:12 +0400

          > From: astarta at rat.ru

          > To: markwillem at hotmail.com

          > CC: psusi at ubuntu.com

          > Subject: Re: Howto: implement AMD SB9xx RAID5 support in
          dmraid

          > 

          > hello,

          > 

          > You may try the attached patch to support RAID5 in pdc
          dmraid format. It 

          > works OK for me.

          > Be sure to patch the kernel itself to support dm-raid45
          target.

          > 

          > 

          > On 04/02/2012 02:59 AM, Phillip Susi wrote:

          > > -----BEGIN PGP SIGNED MESSAGE-----

          > > Hash: SHA1

          > >

          > > On 04/01/2012 04:21 PM, Mark-Willem Jansen wrote:

          > >> ERROR: pdc: zero sectors on /dev/sdd

          > >> ERROR: pdc: setting up RAID device /dev/sdd

          > > It looks like sectors() in pdc.c is missing the case
          for computing the size of a RAID5. For that matter, there
          appears to be no #define for PDC_T_RAID5, so you will need to
          add one and add it to the mapping table in type() and fix
          sectors() to handle it and probably a few other things.

          > >

          > >

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          > 

          > 

          > -- 

          > С уважением,

          > Astarta

          > Администратор Форума "Крысиный Бум"

          > http://rat.ru/forum/index.php

          > 

          > “The Linux philosophy is 'Laugh in the face of danger'.

          > Oops. Wrong One. 'Do it yourself'. Yes, that's it.”

          > (c) Linus Torvalds.

          > 

    -- 
С уважением,
Astarta
Администратор Форума "Крысиный Бум"
http://rat.ru/forum/index.php

“The Linux philosophy is 'Laugh in the face of danger'.
Oops. Wrong One. 'Do it yourself'. Yes, that's it.”
(c) Linus Torvalds.  		 	   		  
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