Hi, I've created mirrored striped arrays (Raid10) and am not confident that my first striped set is in fact being mirrored on my second striped set. When the mirrored mdX devices are created, cat /proc/mdstat does show that re-synching is taking place. However, if I mount an mdX that is part of my second striped set, I see NO files, just a lost+found directory. Hmm, I didn't mount as read-only. It this significant? What techniques can I use to verify that the second striped set is being mirrored? Is there a raidtool to force resynching? If, perchance, an mdX on the first-striped set has a problem, will the mirrored device kick in and re-synch the striped mdX with the problem? When this happens (as I'm sure it probably will at some point), how will I know that it is occurring? I am guessing that the first striped set will be out of operation until it is repaired by re-synching with the mirrored set. How can mirroring be effectively used & monitored? Technical details: Kernel: 2.2.15, patched with unified IDE and mingo raid patch IDE busses: two Promise cards, 4 Maxtor 20.4G drives, one bus per disk raidtab file: ######################################First Striped Set ##/opt=/dev/md0 raiddev /dev/md0 raid-level 0 persistent-superblock 1 chunk-size 64 nr-raid-disks 2 nr-spare-disks 0 device /dev/hde1 raid-disk 0 device /dev/hdg1 raid-disk 1 ##/local=/dev/md1 raiddev /dev/md1 raid-level 0 persistent-superblock 1 chunk-size 64 nr-raid-disks 2 nr-spare-disks 0 device /dev/hde2 raid-disk 0 device /dev/hdg2 raid-disk 1 ##/usr=/dev/md2 raiddev /dev/md2 raid-level 0 persistent-superblock 1 chunk-size 64 nr-raid-disks 2 nr-spare-disks 0 device /dev/hde3 raid-disk 0 device /dev/hdg3 raid-disk 1 #/var=/dev/md3 raiddev /dev/md3 raid-level 0 persistent-superblock 1 chunk-size 64 nr-raid-disks 2 nr-spare-disks 0 device /dev/hde5 raid-disk 0 device /dev/hdg5 raid-disk 1 #/tmp=/dev/md4 raiddev /dev/md4 raid-level 0 persistent-superblock 1 chunk-size 64 nr-raid-disks 2 nr-spare-disks 0 device /dev/hde6 raid-disk 0 device /dev/hdg6 raid-disk 1 #########################################Second Striped Set ##/opt=/dev/md0,md5 raiddev /dev/md5 raid-level 0 persistent-superblock 1 chunk-size 64 nr-raid-disks 2 nr-spare-disks 0 device /dev/hdi1 raid-disk 0 device /dev/hdk1 raid-disk 1 ##/local=/dev/md1,md6 raiddev /dev/md6 raid-level 0 persistent-superblock 1 chunk-size 64 nr-raid-disks 2 nr-spare-disks 0 device /dev/hdi2 raid-disk 0 device /dev/hdk2 raid-disk 1 ##/usr=/dev/md2,md7 raiddev /dev/md7 raid-level 0 persistent-superblock 1 chunk-size 64 nr-raid-disks 2 nr-spare-disks 0 device /dev/hdi3 raid-disk 0 device /dev/hdk3 raid-disk 1 #/var=/dev/md3,md8 raiddev /dev/md8 raid-level 0 persistent-superblock 1 chunk-size 64 nr-raid-disks 2 nr-spare-disks 0 device /dev/hdi5 raid-disk 0 device /dev/hdk5 raid-disk 1 #/tmp=/dev/md4,md9 raiddev /dev/md9 raid-level 0 persistent-superblock 1 chunk-size 64 nr-raid-disks 2 nr-spare-disks 0 device /dev/hdi6 raid-disk 0 device /dev/hdk6 raid-disk 1 #######################################Mirrored ##/opt=/dev/md0,md5 raiddev /dev/md10 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 persistent-superblock 1 chunk-size 64 device /dev/md0 raid-disk 0 device /dev/md5 raid-disk 1 ##/local=/dev/md1,md6 raiddev /dev/md11 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 persistent-superblock 1 chunk-size 64 device /dev/md1 raid-disk 0 device /dev/md6 raid-disk 1 ##/usr=/dev/md2,md7 raiddev /dev/md12 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 persistent-superblock 1 chunk-size 64 device /dev/md2 raid-disk 0 device /dev/md7 raid-disk 1 #/var=/dev/md3,md8 raiddev /dev/md13 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 persistent-superblock 1 chunk-size 64 device /dev/md3 raid-disk 0 device /dev/md8 raid-disk 1 #/tmp=/dev/md4,md9 raiddev /dev/md14 raid-level 1 nr-raid-disks 2 nr-spare-disks 0 persistent-superblock 1 chunk-size 64 device /dev/md4 raid-disk 0 device /dev/md9 raid-disk 1 ---------------- fstab file: /dev/hda13 / ext2 defaults 1 1 /dev/hda2 /boot ext2 defaults 1 2 /dev/hda8 /home ext2 defaults 1 2 /dev/md1 /local ext2 defaults 1 2 /dev/cdrom /mnt/cdrom iso9660 noauto,owner,ro 0 0 /dev/md0 /opt ext2 defaults 1 2 /dev/md4 /tmp ext2 defaults 1 2 /dev/md2 /usr ext2 defaults 1 2 /dev/hda9 /usr/src ext2 defaults 1 2 /dev/md3 /var ext2 defaults 1 2 /dev/fd0 /mnt/floppy auto noauto,owner 0 0 none /proc proc defaults 0 0 none /dev/pts devpts gid=5,mode=620 0 0 /dev/hda12 swap swap defaults 0 0 /dev/hde7 swap swap defaults,pri=1 0 0 /dev/hdg7 swap swap defaults,pri=1 0 0 /dev/hdi7 swap swap defaults,pri=1 0 0 /dev/hdk7 swap swap defaults,pri=1 0 0
