[dm-devel] RAID5 compatibility.

[Wood, Brian J]

You need to use the raid 4/5 patch from the maintainers website to have dmraid 4/5 support added. Here's the link:

http://people.redhat.com/heinzm/sw/dm/dm-raid45/dm-raid45-2.6.25-rc2_20080221.patch.bz2 

Unzip this patch using bunzip2 and apply it to your 2.6.25-rc2 kernel. Then using "make gconfig" or "make menuconfig" go into "Device Drivers->Multiple devices driver support (RAID and LVM)->Device mapper support" and select "RAID 4/5 target". 

Brian Wood
Software Engineer
Intel Corp., Manageability & Platform Software Division
brian.j.wood at intel.com

>-----Original Message-----
>From: dm-devel-bounces at redhat.com [mailto:dm-devel-bounces at redhat.com] On Behalf Of silentphoebus
>Sent: Wednesday, February 27, 2008 9:00 AM
>To: dm-devel at redhat.com
>Subject: RE: RE: [dm-devel] RAID5 compatibility.
>
>Thank you for your answer.
>I can't manage the raid5 to work,
>here are what what i do :
>
>dmraid -s give me :
>*** Group superset isw_hdaagdcbc
>--> Subset
>name   : isw_hdaagdcbc_RAID5
>size   : 1465177344
>stride : 128
>type   : raid5_la
>status : ok
>subsets: 0
>devs   : 4
>spares : 0
>
>dmraid -tay give me :
>isw_hdaagdcbc_RAID5: 0 1465177344 raid45 core 2 131072 nosync raid5_la 1 128 4 -1 /dev/sda 0
>/dev/sdb 0 /dev/sdc 0 /dev/sde 0
>
>and dmraid -ay give me :
>ERROR: device-mapper target type "raid45" not in kernel
>and the /dev/mapper/ show only the control file.
>
>i have try with the from the cvs tree and the current tools.
>i use the latest kernel with raid456 compiled as modules and loaded.
>
>What should i do to make the raid5 work.
>Thank you very much.
>>
>>
>> > Message du 26/02/08 à 10h00
>> > De : "Cetnerowski, Adam" <adam.cetnerowski at intel.com>
>> > A : silentphoebus at voila.fr, "device-mapper development" <dm-devel at redhat.com>
>> > Copie à :
>> > Objet : RE: [dm-devel] RAID5 compatibility.
>> >
>> >
>> >
>> > > -----Original Message-----
>> > > From: dm-devel-bounces at redhat.com [mailto:dm-devel-bounces at redhat.com]
>> > On > Behalf Of silentphoebus
>> > > Sent: Monday, February 25, 2008 8:07 PM
>> > > To: dm-devel at redhat.com
>> > > Subject: [dm-devel] RAID5 compatibility.
>> > >
>> > > Hi all,
>> > > i found a lot of informations on the internet for intel software raid5
>> > > with ICH controler.
>> > > So, the best is maybe to ask here.
>> > > Is it compatible with the dmraid mapper or not ?
>> > > Thank you for taking time to read.
>> >
>> > Hi,
>> >
>> > The software RAID 5 does indeed use device mapper. I would like to note
>> > that at the moment it is in the experimental stage, while we work on
>> > some of the features.
>> >
>> > Adam Cetnerowski
>> > Intel Technology Poland
>> >
>> >
>
>
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