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howtos:misc:software_raid_troubleshoot_howto [2016/11/27 12:20 (UTC)]
wisedraco [Software RAID troubleshoot]
howtos:misc:software_raid_troubleshoot_howto [2017/06/26 15:08 (UTC)]
wisedraco [Workarounds for incorrect raid devices naming]
Line 65: Line 65:
 Then i do massive system update via slackpkg update-all, including kernel update too.\\ Then i do massive system update via slackpkg update-all, including kernel update too.\\
 check lilo.conf, restart - all looks ok. then i decide to upgrade system to 14.2 via the same slackpkg \\ check lilo.conf, restart - all looks ok. then i decide to upgrade system to 14.2 via the same slackpkg \\
-( looks like live on macos is too boring, too predictable - all work, and so on...:D )+( looks like live on macos is too boring, too predictable - all work, and so on...:D )\\
 always, i check lilo.conf, check the new kernel is named right, have no old kernel for backup - \\ always, i check lilo.conf, check the new kernel is named right, have no old kernel for backup - \\
 only one entry in lilo ( who was not good thing at all! ), and do reboot. only one entry in lilo ( who was not good thing at all! ), and do reboot.
Line 331: Line 331:
  
  do a   do a 
 +
 +<code>
 ls /dev/disk/by-uuid/ ls /dev/disk/by-uuid/
 +</code>
  
 or better, go in that location with midnight commander, and youl see, there is a "files" named as numbers -  or better, go in that location with midnight commander, and youl see, there is a "files" named as numbers - 
 that was the raid array disk uuid - and symlink to /dev/mdx. that was the raid array disk uuid - and symlink to /dev/mdx.
 +
 +for automate info feed into fstab you can use this way:
 +
 +<code>
 +
 +cd /dev/disk/by-uuid
 +
 +ls -d -l $PWD/* >> /etc/fstab
 +</code>
 +
 +after that you must immediately edit /etc/fstab and make in a right way, otherwise you may have problems with mounting in next boot...
 +
  
 <code> <code>
Line 350: Line 365:
 </code> </code>
  
-take a note!+<note important>take a note!
 disk UUID by  disk UUID by 
  
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 and that one, who you get via  and that one, who you get via 
 +
 +<code>
 mdadm -D mdadm -D
 mdadm -Db mdadm -Db
 mdadm -Es mdadm -Es
 +</code>
  
-differ! in fstab ( lilo too?) you must use UID from /dev/disk/by-uuid/  !+differ, not the same!!! 
 + in fstab ( lilo too?) you must use UID from /dev/disk/by-uuid/  !</note>
  
  
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   - 2. Using initramd.   - 2. Using initramd.
  
 +<code>
 # #
 # mkinitrd_command_generator.sh revision 1.45 # mkinitrd_command_generator.sh revision 1.45
Line 380: Line 400:
 mkinitrd -c -k 3.2.29 -f ext4 -r /dev/md1 -m mbcache:jbd2:ext4 -R -u -o /boot/initrd.gz mkinitrd -c -k 3.2.29 -f ext4 -r /dev/md1 -m mbcache:jbd2:ext4 -R -u -o /boot/initrd.gz
  
-rightly edited mdadm.conf then must be copied in/boot/tree??? before you run this mkinitrd conf.+</code> 
 +\\ 
 +\\ 
 +rightly edited mdadm.conf then must be copied in/boot/tree??? before you run this mkinitrd conf.\\
  
 after you run that mkinitrd, you must update lilo. after you run that mkinitrd, you must update lilo.
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 ====== Useful commands in this case ====== ====== Useful commands in this case ======
  
 +show raid array info:
 +
 +<code>
 mdadm -Es mdadm -Es
 +</code>
 +
 +Assemble RAID array based on mdadm.conf
 +<code>
 mdadm -As mdadm -As
 +</code>
  
 +show array info:
 +<code>
 mdadm -D /dev/md127 mdadm -D /dev/md127
 +</code>
 +
 +show defined array another info:
 +<code>
 mdadm -Db /dev/md127 mdadm -Db /dev/md127
 +</code>
  
 +show scsi devices info: 
 +<code>
 lsscsi lsscsi
 +</code>
 +
 +show assembled raid arrays status:
 +<code>
 cat /proc/mdstat cat /proc/mdstat
 +</code>
 +
 +show UUID info about discs ( or RAID arrays) in system:
 +<code>
 ls /dev/disk/by-uuid/ ls /dev/disk/by-uuid/
 +</code>
  
 +<code>
 dmesg |grep md dmesg |grep md
 +</code>
  
 +re-run lilo, when booted from another source.
 +<code>
 chroot /mnt/hd /sbin/lilo -v 3 chroot /mnt/hd /sbin/lilo -v 3
 +</code>
  
 +
 +stop named RAID array:
 +<code>
 mdadm --stop /dev/md127 mdadm --stop /dev/md127
 +</code>
  
 kernel options: kernel options:
 +
 +<code>
 +$kernelname raid=noautodetect md=1, /dev/sda1,/dev/sdb1
 +</code>
 +
 +turn on not to autodetect RAID arrays, and define raid array /dev/md1, from two partitions ( members? )
  
  

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