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howtos:misc:software_raid_troubleshoot_howto [2016/11/24 20:05 (UTC)]
wisedraco [My fall and sucess story]
howtos:misc:software_raid_troubleshoot_howto [2017/06/26 15:08 (UTC)] (current)
wisedraco [Workarounds for incorrect raid devices naming]
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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 ======
  
Line 5: Line 6:
 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 :
  
Line 37: Line 40:
 unused devices: <none> unused devices: <none>
 </code> </code>
 +\\ 
 +\\
 mdadm -Es : mdadm -Es :
  
Line 48: Line 52:
  
 </code> </code>
-// +\\ 
-//+\\ 
 +<code>
 # for p in 1 2 3 4; do mdadm --create /dev/md$p --name=$p --level=1 --raid-devices 2 /dev/sda$p /dev/sdb$p --metadata=0.90; done # for p in 1 2 3 4; do mdadm --create /dev/md$p --name=$p --level=1 --raid-devices 2 /dev/sda$p /dev/sdb$p --metadata=0.90; done
 +</code>
 +\\
  
  ===== My "fall" and "sucess" story =====  ===== My "fall" and "sucess" story =====
Line 58: 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.
 \\ \\
 Then all interesting things start!!! :) Then all interesting things start!!! :)
- +\\  
-I have LiLo menu, kernel start loading. +\\ 
-it show lots of "..." but then all stop, and nothing more do. +I have LiLo menu, kernel start loading... 
-That was indicated some problems with lilo updating, i suppose. +\\ 
-I want to boot, and re-run lilo -v+it show lots of "..." but then all stop, and nothing more do.\\ 
 +That was indicated some problems with lilo updating, i suppose.\\ 
 +I want to boot, and re-run lilo -v \\
 As so, i booting from Slackware64 Live CD [[http://bear.alienbase.nl/mirrors/slackware-live/]] from AlienBob, and try mount my root partition for run lilo again. As so, i booting from Slackware64 Live CD [[http://bear.alienbase.nl/mirrors/slackware-live/]] from AlienBob, and try mount my root partition for run lilo again.
 +\\ 
 +\\
 But - there was a big problem! But - there was a big problem!
 +\\
 there no my /dev/md1, /dev/md2, /dev/md3 and /dev/md4 after i load via slackware live CD! there no my /dev/md1, /dev/md2, /dev/md3 and /dev/md4 after i load via slackware live CD!
 +\\
 and my lilo.conf was that: and my lilo.conf was that:
 +\\
 <code> <code>
 # LILO configuration file # LILO configuration file
Line 146: Line 156:
 # Linux bootable partition config ends # Linux bootable partition config ends
 </code> </code>
 +\\ 
 so i do some research, do so i do some research, do
 +<code>
 dmesg |grep md dmesg |grep md
 +</code> 
 +\\ 
 and from array size found out, what number was my root partition ( it was 100 gb size). it was md126. and from array size found out, what number was my root partition ( it was 100 gb size). it was md126.
 +\\ 
 i mount it: i mount it:
 +<code>
 mount /dev/md126 /mnt/hd mount /dev/md126 /mnt/hd
 +</code>
 +\\  
  
 +Then i run mc, and check, i was really mount there my root partition.
 +\\ 
  
-then i run mc, and check, i was really mount there my root partition. +Then i do in console 
- +\\  
-then i do in console +<code>
 chroot /mnt/hd /sbin/lilo -v 3 chroot /mnt/hd /sbin/lilo -v 3
 +</code> 
 +\\ 
 but - lilo command end with error - it was cannot find root partition - /dev/md1. but - lilo command end with error - it was cannot find root partition - /dev/md1.
  
-That was problem, because now /dev/md1 was become as /dev/md126 for whatever reason.+That was problem, because now /dev/md1 was become as /dev/md126 for whatever reason.\\
 Then, i do some reading about RAID subsystems, forums and so on, made some mistakes and experiments, who resulted on these shortcuts: Then, i do some reading about RAID subsystems, forums and so on, made some mistakes and experiments, who resulted on these shortcuts:
 +\\
  
-I made array assembling strings in mdadm.conf:+I made array assembling strings in mdadm.conf via do these comands in terminal:
  
 +<code>
 mdadm -Db /dev/md127 >> /mnt/hd/etc/mdadm.conf mdadm -Db /dev/md127 >> /mnt/hd/etc/mdadm.conf
  
Line 173: Line 193:
 mdadm -Db /dev/md125 >> /mnt/hd/etc/mdadm.conf mdadm -Db /dev/md125 >> /mnt/hd/etc/mdadm.conf
 mdadm -Db /dev/md124 >> /mnt/hd/etc/mdadm.conf mdadm -Db /dev/md124 >> /mnt/hd/etc/mdadm.conf
 +</code>
 +\\
 +\\
 +In a result i get something like that in end of mdadm.conf:
 +\\
 +<code>
 +ARRAY /dev/md125 metadata=0.90 UUID=7cc47bea:832f8260:208cdb8d:9e23b04b  #this one is 100 gb partition: \ (md1)
 +ARRAY /dev/md124 metadata=0.90 UUID=f0bc71fc:8467ef54:208cdb8d:9e23b04b  # 375 gb partition - \home - md3
 +ARRAY /dev/md126 metadata=0.90 UUID=3f4daae2:cbf37a2a:208cdb8d:9e23b04b  # 514 Gb partition - \Second - md4
 +ARRAY /dev/md127 metadata=0.90 UUID=cce81d3a:78965aa5:208cdb8d:9e23b04b  # 2 Gb partition   - swap - md2
 +</code>
  
-get something like that in end of mdadm.conf+then, based on 
- +\\ 
-#ARRAY /dev/md125 metadata=0.90 UUID=7cc47bea:832f8260:208cdb8d:9e23b04b  #100 gb partition: md1 +<code>
-#ARRAY /dev/md124 metadata=0.90 UUID=f0bc71fc:8467ef54:208cdb8d:9e23b04b  # 375 gb partition - \home - md3 +
-#ARRAY /dev/md126 metadata=0.90 UUID=3f4daae2:cbf37a2a:208cdb8d:9e23b04b  # 514 Gb partition  - second-md4 +
-#ARRAY /dev/md127 metadata=0.90 UUID=cce81d3a:78965aa5:208cdb8d:9e23b04b  # 2 Gb partition  - swap - md2 +
- +
- +
-then, based on +
 dmesg | grep md dmesg | grep md
-and /mnt/hd/etc/fstab i found out which md12x must be md1, md2, md3 and md4, and write it there after £ as shown. +</code> 
- +\\ 
-then i edit it to become in right way: +and /mnt/hd/etc/fstab i found out which md12x must be md1, md2, md3 and md4, and write it there after as shown above
 +\\ 
 +\\ 
 +Then i edit it to become in right way: 
 +\\ 
 +<code>
 ARRAY /dev/md1 metadata=0.90 UUID=7cc47bea:832f8260:208cdb8d:9e23b04b ARRAY /dev/md1 metadata=0.90 UUID=7cc47bea:832f8260:208cdb8d:9e23b04b
 ARRAY /dev/md2 metadata=0.90 UUID=cce81d3a:78965aa5:208cdb8d:9e23b04b ARRAY /dev/md2 metadata=0.90 UUID=cce81d3a:78965aa5:208cdb8d:9e23b04b
 ARRAY /dev/md3 metadata=0.90 UUID=f0bc71fc:8467ef54:208cdb8d:9e23b04b ARRAY /dev/md3 metadata=0.90 UUID=f0bc71fc:8467ef54:208cdb8d:9e23b04b
 ARRAY /dev/md4 metadata=0.90 UUID=3f4daae2:cbf37a2a:208cdb8d:9e23b04b ARRAY /dev/md4 metadata=0.90 UUID=3f4daae2:cbf37a2a:208cdb8d:9e23b04b
 +</code> 
 +\\
 also i wrote in mdadm.conf that string, just to be sure, hostname do not affect raid naming: also i wrote in mdadm.conf that string, just to be sure, hostname do not affect raid naming:
 +\\ 
 +<code>
 HOMEHOST <ignore> HOMEHOST <ignore>
 +</code> 
 +\\
 then i made mdadm_stop_127.scr script: then i made mdadm_stop_127.scr script:
 +\\
 <code bash> <code bash>
 #!/bin/sh #!/bin/sh
Line 218: Line 250:
 </code> </code>
  
-copy it to livesystem root, copy my edited mdadm.conf from /mnt/hd/etc/mdadm.conf +\\ 
-to livesystem /etc, and umount /dev/md125 +\\ 
 +copy it to livesystem root, copy also my edited mdadm.conf from /mnt/hd/etc/mdadm.conf 
 +to livesystem /etc, and umount /dev/md125 
 +\\ 
 +\\
  
-and then  i run it my mdadm_stop_127.scr +And then  i run it my mdadm_stop_127.scr 
- +\\ 
-see, all that arrays be stopped, and +\\ 
 +see, all that arrays be stopped, and 
 then i run: then i run:
 +\\ 
 +<code>
 mdadm -As mdadm -As
 +</code> 
 +\\
 then i see then i see
  
 +<code>
 cat /proc/mdstat cat /proc/mdstat
- +</code> 
- +\\ 
-see, all my RAID become as it must be - /dev/md1, md2, md3, and md4! +see, all my RAID become as it must be - /dev/md1, md2, md3, and md4! 
- +\\ 
- +\\ 
-then i do  +then i do mount my root hdd again: 
- +\\ 
- mount my root hdd again: +<code>
 mount /dev/md1  /mnt/hd mount /dev/md1  /mnt/hd
 +</code>
 +\\
 +and do:
  
-and do +<code>
 chroot /mnt/hd /sbin/lilo -v 3 chroot /mnt/hd /sbin/lilo -v 3
 +</code>
 +\\
  
 all looks good. all looks good.
-i do restart +i do restart: 
 +<code>
 shutdown -r now  shutdown -r now 
 +</code>
  
 ( or press ctrl +alt+ del) ( or press ctrl +alt+ del)
 +\\ 
 +\\
 after restart i see, system start loading, and went after previously dead point. i get to after restart i see, system start loading, and went after previously dead point. i get to
 login screen, log in as root, and see, there is md1 ( root) and md2 ( swap), but no md3 and md4 ( instead of it i have these /home and /Second arrays as md125 and md124). login screen, log in as root, and see, there is md1 ( root) and md2 ( swap), but no md3 and md4 ( instead of it i have these /home and /Second arrays as md125 and md124).
Line 260: Line 305:
  
 i restart machine, press tab on LiLo prompt, and use kernel parameters: i restart machine, press tab on LiLo prompt, and use kernel parameters:
 +\\ 
 +<code>
 Linux raid=noautodetect md=1,/dev/sda1,/dev/sdb1 Linux raid=noautodetect md=1,/dev/sda1,/dev/sdb1
- +</code> 
 +\\
 that says kernel not to autodetect raid arrays, but assemble md1 raid ( md=1) from /dev/sda1 and /dev/sdb1 partition, that says kernel not to autodetect raid arrays, but assemble md1 raid ( md=1) from /dev/sda1 and /dev/sdb1 partition,
 because without root kernel system cant start. because without root kernel system cant start.
 +\\
 as i load system in that way, all looks right - there was /dev/md1, md2, md3 and md4. as i load system in that way, all looks right - there was /dev/md1, md2, md3 and md4.
 +\\
 then i just do system restart, without any kernel parameters, and all again going to be right - md1 till md4. then i just do system restart, without any kernel parameters, and all again going to be right - md1 till md4.
 +\\
 looks like, system writes something in RAID arrays superblock, or metadata, or something like that, about previously gived md name, because, if not, after restart i must get again situation as previously - with md1, md2, md125 and ,d124... looks like, system writes something in RAID arrays superblock, or metadata, or something like that, about previously gived md name, because, if not, after restart i must get again situation as previously - with md1, md2, md125 and ,d124...
- +\\ 
 +\\
 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.   - 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.
 +
 +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>
 +/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>
 +
  
  
Line 284: Line 386:
   - 2. Using initramd.   - 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.
  
 +
 + 
  
  
Line 299: Line 417:
  
  
 +
 +
 + 
 ====== 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>
  
-mdadm --stop /dev/md127 
  
 +stop named RAID array:
 +<code>
 +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? )
  
  
Line 334: Line 494:
  
 ====== Sources ====== ====== Sources ======
-Originally written by  --- //[[wiki:user:wisedraco|John Ciemgals]] 2013/02/07 04:50//+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]] 2014/03/19 01:15//+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.--> <!-- Please do not modify anything below, except adding new tags.-->
 {{tag>software raid raid1 /dev/md127 enumeration broken linux slackware author_wisedraco}} {{tag>software raid raid1 /dev/md127 enumeration broken linux slackware author_wisedraco}}
 +
 +
 +
 +
  

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