> Here are some relevant data of the test setup that may be usefull: > [root@test]# cat /etc/raidtab > raiddev /dev/md0 > raid-level 1 > nr-raid-disks 2 > nr-spare-disks 0 > chunk-size 4 > persistent-superblock 1 > device /dev/sda2 > raid-disk 0 > device /dev/sdb2 > raid-disk 1 I think that you must replace: nr-raid-disks 2 with nr-raid-disks 3 Plus, the correspinding entry: device /dev/sdb3 raid-disk 2 Else, the third drive isn't recognized as part of the md array. Probably, you must restart the array (only first time). You may want to use mdadm instead of raidtools. > /proc/mdstat BEFORE adding the 3-rd device: > [root@test]# cat /proc/mdstat > Personalities : [raid1] > read_ahead 1024 sectors > md0 : active raid1 scsi/host3/bus0/target0/lun0/part2[1] > scsi/host2/bus0/target0/lun0/part2[0] > 710938560 blocks [2/2] [UU] > > unused devices: <none> > > Then I add the 3-rd device: > [root@test]# raidhotadd /dev/md0 /dev/sdb3 > > /proc/mdstat AFTER adding 3-rd device > > [root@nfs10 root]# cat /proc/mdstat > Personalities : [raid1] > read_ahead 1024 sectors > md0 : active raid1 scsi/host3/bus0/target0/lun0/part3[2] > scsi/host3/bus0/target0/lun0/part2[1] scsi/host2/bus0/target0/lun0/part2[0] > 710938560 blocks [2/2] [UU] > > unused devices: <none> > > Piece of the syslog showing the add results: > ..... > Jan 7 12:09:01 nfs10 kernel: md: updating md0 RAID superblock on device > Jan 7 12:09:01 nfs10 kernel: md: scsi/host3/bus0/target0/lun0/part3 > [events: 00000012]<6>(write) scsi/host3/bus0/target0/lun0/part3's sb > offset: 725598144 > Jan 7 12:09:01 nfs10 kernel: md: scsi/host3/bus0/target0/lun0/part2 > [events: 00000012]<6>(write) scsi/host3/bus0/target0/lun0/part2's sb > offset: 710938560 > Jan 7 12:09:01 nfs10 kernel: md: scsi/host2/bus0/target0/lun0/part2 > [events: 00000012]<6>(write) scsi/host2/bus0/target0/lun0/part2's sb > offset: 710938560 > ...... > > The problem is that no sync is done, as a matter of fact the 3rd > disk is not even scrached visibly ;(, did I miss someting obvious or > what I want is impossible ??? > > Thank you for reading such a long mail and for any help that will > lead me solving this, > > Mircea Ciocan > > > > > > > > > > - > 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 > --- Catalin(ux) BOIE catab@deuroconsult.ro - 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
