Hello, > -----Original Message----- > From: redhat-list-bounces@xxxxxxxxxx > [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of Richard Hobbs > Sent: 20 January 2005 10:02 > To: 'General Red Hat Linux discussion list' > Subject: RE: Soft-Raid Testing and other stuff... > > Hello, > > > > I have built two RedHat 8.0 machines, both using soft-raid > > to mirror one > > > 250GB disk onto the other identical 250GB disk inside the case. > > > > > > During the install, I created the RAID partitions, and > > assigned them to > > > actual partitions, and now I have "/dev/md0" up to "/dev/md7". > > > > > > However, each time I boot and each time I shut down, I get > > the following > > > message: > > > > > > No spare disk to reconstruct array! -- running in degraded mode. > > > > > > What exactly does this mean? Both drives are visible from > > the BIOS, and the > > > jumpers are set to Cable Select (not Master and Slave). > > > > > > Despite the above error message, the machine boots fine, > > shuts down fine, > > > and runs fine. > > > > When it's up, cat /proc/mdstat > > -------------------------------------------------- > [root@stg-slave root]# cat /proc/mdstat > Personalities : [raid1] > read_ahead 1024 sectors > md7 : active raid1 hda9[0] > 71296320 blocks [2/1] [U_] > > md3 : active raid1 hda8[0] > 2096384 blocks [2/1] [U_] > > md4 : active raid1 hda7[0] > 10482304 blocks [2/1] [U_] > > md6 : active raid1 hda6[0] > 73400832 blocks [2/1] [U_] > > md5 : active raid1 hda5[0] > 73400832 blocks [2/1] [U_] > > md2 : active raid1 hda3[0] > 7164864 blocks [2/1] [U_] > > md1 : active raid1 hda2[0] > 7164864 blocks [2/1] [U_] > > md0 : active raid1 hda1[0] > 104320 blocks [2/1] [U_] > > unused devices: <none> > [root@stg-slave root]# > -------------------------------------------------- > > > > However, if I unplug the master hard drive, it will not > > boot from the > > > secondary, even if I plug it into the primary socket on the > > IDE cable. > > > > Did you duplicate the MBR to the second drive? If you > > didn't, you won't > > boot. Remember that you've only mirrored the data > partitions, not the > > boot block. > > I didn't duplicate the MBR as far as I know... I assumed that RAID 1 > (mirroring) mirrored the entire disk, sector for sector... > > If I duplicate the MBR successfully, does that mean I should > be able to > simply remove the primary, and boot from the secondary alone? > > Also, if I then insert a blank disk, will it automatically > re-generate the > data onto it? Will I have to duplicate the MBR manually again? > > Finally, how can I duplicate the MBR onto the secondary disk? > > > > I have even tried inserting a third 250GB hard drive on the > > secondary IDE > > > channel to see if that would become the spare disk it needs > > to reconstruct > > > the array, but that didn't work either. > > > > I wouldn't expect it to. I would not be happy if the software just > > grabbed an extra drive and toasted the data on it unless I > explicitely > > told it to. > > Very true... It was a last ditch attempt to eliminate that if nothing > else... Lol > > Thanks for your help Ed... I look forward to hearing from you > again soon :-) > > Hobbs. I have just found this web page... http://www.kieser.net/linux/raidhotadd.html ...and I'm currently following the instructions on it. So far, I have typed: > raidhotadd /dev/md1 /dev/hdb2 > raidhotadd /dev/md0 /dev/hdb1 > raidhotadd /dev/md2 /dev/hdb3 > raidhotadd /dev/md5 /dev/hdb5 > raidhotadd /dev/md6 /dev/hdb6 > raidhotadd /dev/md4 /dev/hdb7 > raidhotadd /dev/md3 /dev/hdb8 > raidhotadd /dev/md7 /dev/hdb9 The current output from /proc/mdstat is: -------------------------------------------------- -------------------------------------------------- This is looking more promising, but I don't think it's doing the MBR still... Perhaps soft-raid doesn't work under RH8 as standard, otherwise it wouldn't boot the disks from the array and cause me to have to manually re-add them... I shall keep you updated on how this goes. Hobbs. -- Richard Hobbs (Systems Administrator) Toshiba Research Europe Ltd. - Speech Technology Group Web: http://www.toshiba-europe.com/research/ Email: richard.hobbs@xxxxxxxxxxxxxxxxx Tel: +44 1223 376964 Mobile: +44 7811 803377 _____________________________________________________________________ This e-mail has been scanned for viruses by MCI's Internet Managed Scanning Services - powered by MessageLabs. For further information visit http://www.mci.com -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
