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howtos:misc:software_raid_troubleshoot_howto [2016/11/27 11:48 (UTC)]
wisedraco
howtos:misc:software_raid_troubleshoot_howto [2016/11/27 12:45 (UTC)]
wisedraco [Useful commands in this case]
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 <!-- Add your text below. We strongly advise to start with a Headline (see button bar above). --> <!-- Add your text below. We strongly advise to start with a Headline (see button bar above). -->
 +
 ====== Software RAID troubleshoot ====== ====== Software RAID troubleshoot ======
  
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 i be done with system, who,after lilo menu,\\ i be done with system, who,after lilo menu,\\
  write "loading kernel ............................." \\  write "loading kernel ............................." \\
 +\\
 and then stops completely - nothing more.\\ and then stops completely - nothing more.\\
 +\\
 Initial configuration was:\\ Initial configuration was:\\
 Intel DG965SS motherboard, core 2 duo 2.2 gHz E4500 CPU, 8 Gb RAM, \\ Intel DG965SS motherboard, core 2 duo 2.2 gHz E4500 CPU, 8 Gb RAM, \\
 2 x 1000 Gb Seagate SATA HDD ( as sda and sdb)\\ 2 x 1000 Gb Seagate SATA HDD ( as sda and sdb)\\
 ST1000DM003-1CH1\\ ST1000DM003-1CH1\\
-dvd-writer on sata4 port+dvd-writer on sata4 port
  
 both seagate discs is partitioned as FD type ( linux autodetect raid) and 4 partitions ( mbr type) -  both seagate discs is partitioned as FD type ( linux autodetect raid) and 4 partitions ( mbr type) - 
-   * 100 Gb root (md1) +  * 100 Gb root (md1) 
-  *  2 Gb swap (md2) +  * 2 Gb swap (md2) 
-  *  350 Gb /home (md3) +  * 350 Gb /home (md3) 
-  *  550 Gb /Second (md4) +  * 550 Gb /Second (md4) 
 +\\ 
 +\\
 cat /proc/mdstat : cat /proc/mdstat :
  
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 unused devices: <none> unused devices: <none>
 </code> </code>
 +\\ 
 +\\
 mdadm -Es : mdadm -Es :
  
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 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.
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 that was, in a most, all of story. that was, in a most, all of story.
 yet, there is some another workarounds of that situation. yet, there is some another workarounds of that situation.
 +\\
 +\\
 +
 + ===== Workarounds for incorrect raid devices naming =====
 +
 +
 +  - 1. Using UUID in lilo ( i do not check this), and in fstab for mounting partitions.
 +
 + do a 
 +
 +<code>
 +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 - 
 +that was the raid array disk uuid - and symlink to /dev/mdx.
 +
 +<code>
 +/dev/md2         swap             swap        defaults           0
 +/dev/md1         /                ext4        defaults           1
 +##/dev/md3         /home            ext4        defaults           2
 +/dev/disk/by-uuid/ef92814a-2db1-4d47-8d70-4c5a8d56e287   /home            ext4        defaults           2
 +/dev/md4         /Second          ext4        defaults           2
 +#/dev/cdrom      /mnt/cdrom       auto        noauto,owner,ro,comment=x-gvfs-show 0   0
 +/dev/fd0         /mnt/floppy      auto        noauto,owner       0
 +devpts           /dev/pts         devpts      gid=5,mode=620     0
 +proc             /proc            proc        defaults           0
 +tmpfs            /dev/shm         tmpfs       defaults           0
 +
 +</code>
 +
 +<note important>take a note!
 +disk UUID by 
 +
 +/dev/disk/by-uuid/
 +
 +and that one, who you get via 
 +
 +<code>
 +mdadm -D
 +mdadm -Db
 +mdadm -Es
 +</code>
 +
 +differ, not the same!!!
 + in fstab ( lilo too?) you must use UID from /dev/disk/by-uuid/  !</note>
 +
 +
 +
 +
 +  - 2. Using initramd.
 +
 +<code>
 +#
 +# mkinitrd_command_generator.sh revision 1.45
 +#
 +# This script will now make a recommendation about the command to use
 +# in case you require an initrd image to boot a kernel that does not
 +# have support for your storage or root filesystem built in
 +# (such as the Slackware 'generic' kernels').
 +# A suitable 'mkinitrd' command will be:
 +
 +#/usr/share/mkinitrd/
 +
 +mkinitrd -c -k 3.2.29 -f ext4 -r /dev/md1 -m mbcache:jbd2:ext4 -R -u -o /boot/initrd.gz
 +
 +</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.
 +
 +
 + 
 +
 +
 +
 +
 + 
 +
 +
 +
 +
 +
 + 
 +====== Useful commands in this case ======
 +
 +show raid array info:
 +
 +<code>
 +mdadm -Es
 +</code>
 +
 +Assemble RAID array based on mdadm.conf
 +<code>
 +mdadm -As
 +</code>
 +
 +show array info:
 +<code>
 +mdadm -D /dev/md127
 +</code>
 +
 +show defined array another info:
 +<code>
 +mdadm -Db /dev/md127
 +</code>
 +
 +show scsi devices info:
 +<code>
 +lsscsi
 +</code>
 +
 +show assembled raid arrays status:
 +<code>
 +cat /proc/mdstat
 +</code>
 +
 +show UUID info about discs ( or RAID arrays) in system:
 +<code>
 +ls /dev/disk/by-uuid/
 +</code>
 +
 +<code>
 +dmesg |grep md
 +</code>
 +
 +re-run lilo, when booted from another source.
 +<code>
 +chroot /mnt/hd /sbin/lilo -v 3
 +</code>
 +
 +
 +stop named RAID array:
 +<code>
 +mdadm --stop /dev/md127
 +</code>
 +
 +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? )
 +
 +
 +
 +====== Useful Links: ======
 +  * [[http://www.linuxquestions.org/questions/slackware-14/repair-lilo-on-software-raid1-4175593663/]]
 +  * [[https://bugzilla.redhat.com/show_bug.cgi?id=606481]]
 +  * [[https://www.linux.org.ru/forum/admin/13033496?lastmod=1479927790872]] (in russian )
 +  * [[https://raid.wiki.kernel.org/index.php/Linux_Raid]]
 +  * [[https://www.kernel.org/doc/Documentation/md.txt]]
 +  
 +
 +
 +
 +====== Sources ======
 +Originally written by  --- //[[wiki:user:wisedraco|John Ciemgals]] 2016/11/28 04:50//
 +
 +Rewrited with used materials from "Links" and LinuxQuestions.org Slackware forum, especially user bassmadrigal and bormant from linux.org.ru help --- //[[wiki:user:wisedraco|John Ciemgals]] 2016/11/28 09:15//
 +
 +<!-- Please do not modify anything below, except adding new tags.-->
 +{{tag>software raid raid1 /dev/md127 enumeration broken linux slackware author_wisedraco}}
 +
 +
 +
 +
 +

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