> ECJ wrote: > >>Hello All, >> >>I followed the steps in the link below but my RAID 10 array had a problem >>after a reboot. >>What I did was: >>- constructed 2 RAID0s (3x73GB each) >>- combined these 2 into a RAID1 >>- mkfs.ext3 /dev/md45 (the name of my RAID10 array) >>- mounted it on /data >> >>All seemed ok. It shows on /proc/mdstat. Can write to the partition where >>I mounted it. But after a reboot, I got errors re this new RAID device >> and >>was prompted for the root password to enter repair mode. >>Is there something I am missing here? >> >> >> > Did some tests, and was able to replicate your problem so hopefully this > will work on your system. > > First, make sure the OS can start the RAID-0's. If it can, see if you > can start the RAID10 with: > mdadm -As /dev/md45 > > If you get something like: > mdadm: no devices found for /dev/md45 > > Then the problem is your mdadm.conf file. In that case, run: > mdadm --examine --scan /dev/md4 /dev/md5 >> /etc/mdadm.conf > > And for some reason, it didn't like the devices= field on my system, so > get rid of those and replace it with a "DEVICE partitions" line at the > very top of the file. > > If you can then do the mdadm -As command, you should be good to go. > > And definitely talk to your boss about WHY he wants mirrored stripes. > If its for 'performance reasons' offer to bench the two and that should > show him that any performance difference would be statistically > insignificant and not worth the loss of redundancy. Having numbers to > back up your case may help. > > Hope this helps, > > Daniel > I scrapped the mirrored stripe and switched to striped mirror. What the heck. So I then created 3 mirrors and joined them together. Everything went ok. - 3 RAID1s - /dev/md4 /dev/md5 /dev/md6 - combined them to RAID 0 - /dev/md10 - Did mkfs.ext3 /dev/md10 - Added md10 to /etc/mdadm.conf. Doing 'mdadm --examine --scan --config=/etc/mdadm.conf' shows all my RAID arrays correctly. Now I tried stopping /dev/md10 then restarted it with 'mdadm -As /dev/md10' but then it gives me an error that 'no devices found for /dev/md10.' If I do 'mdadm --examine --scan --config=/etc/mdadm.conf,' /dev/md10 shows up. Any more suggestions? I've given myself until today to make this work, or else I'm gonna go for RAID5. Thanks to all. Edward -- fedora-list mailing list fedora-list@xxxxxxxxxx To unsubscribe: https://www.redhat.com/mailman/listinfo/fedora-list
