You shouldn't need to build a new kernel, just extract the SRPM for the initial
install (CentOS 5, no updated kernels), use the config for the appropriate kernel
(SMP, UP, i386/x86_64), enable the raid10 module and do a 'make modules'. You may
need to do a minor amount of tweaking in the installer image to include this, but
nothing serious. Alternately, just building a driver disk with the module and
source it in the install. Interesting that it's not enabled in the installer
image, because it's present in a fully-booted system... space limitations?
/eli
Ruslan Sivak wrote:
Guy Watkins wrote:
> } -----Original Message-----
> } From: linux-raid-owner@xxxxxxxxxxxxxxx [mailto:linux-raid-
> } owner@xxxxxxxxxxxxxxx] On Behalf Of Ruslan Sivak
> } Sent: Friday, May 04, 2007 12:22 PM
> } To: linux-raid@xxxxxxxxxxxxxxx
> } Subject: raid10 on centos 5
> }
> } I am trying to set up raid 10 and so far with no luck. I have 4
drives,
> } and Anaconda will not let me do raid 10. mdadm doesn't have the
raid 10
> } personality loaded. When I create the array manually like so:
> }
> } 2 drives in /dev/md11 as raid1
> } 2 drives in /dev/md12 as raid1
> } md11 and md12 in /dev/md10 as raid0
> }
> } Everything looks fine from the shell, but anaconda only sees md11 and
> } md12.
> }
> } The only choice I see is to set up LVM over md11 and md12. Is this
> } really raid10?
> }
> } Russ
>
> You are making a RAID1+RAID0 array.
> Try making a real RAID10 array with 4 drives. This way you would
only have
> 1 array with 4 drives.
>
> >From the mdadm man page:
> Currently, Linux supports LINEAR md devices, RAID0 (striping), RAID1
> (mirroring), RAID4, RAID5, RAID6, RAID10, MULTIPATH, and FAULTY.
>
> Notice RAID10 is listed, use that. Man mdadm for more info.
>
> However, I would (and do) use RAID6. With RAID6 any 2 disks can fail
> without data loss. With RAID1+RAID0, any one disk can fail, a second
> failure has a 1 in 3 chance of vast data loss.
>
> I hope this helps,
> Guy
>
> -
>
Guy,
That's what I've been trying to do. Unfortunatelly, my distro, CentOS 5
(based on RHEL 5, I believe), does not have the RAID10 personality in
the kernel. I guess I would have to compile my own kernel and load the
module through a driver disk. Would that work? Are there some
instructions somewhere I can follow?
Russ
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
-
To unsubscribe from this list: send the line "unsubscribe linux-raid" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
