From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eli Stair Subject: Re: raid10 on centos 5 Date: Fri, 04 May 2007 16:29:38 -0700 Message-ID: <463BC1E2.6090301@ilm.com> References: <200705042313.l44NDL712377@www.watkins-home.com> <463BBFFF.70000@istandfor.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <463BBFFF.70000@istandfor.com> Sender: linux-raid-owner@vger.kernel.org To: Ruslan Sivak Cc: Guy Watkins , linux-raid@vger.kernel.org List-Id: linux-raid.ids 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@vger.kernel.org [mailto:linux-raid- > > } owner@vger.kernel.org] On Behalf Of Ruslan Sivak > > } Sent: Friday, May 04, 2007 12:22 PM > > } To: linux-raid@vger.kernel.org > > } 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@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >