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Tsuna
Tux's lil' helper
Joined: 23 Jan 2005
Posts: 147
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 Posted: Mon Jan 24, 2005 11:30 pm Post subject: Cannot boot on a Software RAID0 array. [solved] |
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Hello.
After having had some troubles with the setup of my software raid0 array, I now have some problems to boot my system.
I've read the Software RAID0 HowTO and the official Software RAID HOWTO
So here's my problem.
I have /dev/sda2 and /dev/sdb1, two identical partitions, involved together in my /dev/md0 RAID0 array (FS=ReiserFS). /dev/sda1 is for /boot (it's in ext2) /dev/sda3 and /dev/sdb2 are for swap.
So I installed my RAID array, then did my Gentoo installation as usual, following the handbook etc and then once I finished, I rebooted the system.
Upon reboot, this is what I had:
| Code: | md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE.
ReiserFS: md0: warning: sh-2006: read_super_block: bread failed (dev md0, block 2, size 4096)
ReiserFS: md0: warning: sh-2006: read_super_block: bread failed (dev md0, block 16, size 4096)
EXT2-fs: unable to read superblock
Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(9,0) |
Ok gosh that doesn't look good
So I decided to go back in the LiveCD and see if I could do something.
Once back into the liveCD another question came to me: how to mount /dev/md0 ? I don't have any mdX in /dev !
So I modprobed md and raid0 and /proc/mdstats appeared
Then I searched on google and found raidstart, which is, by chance, on the liveCD, how cool is that
So I started to use raidtstart /dev/md0 but heh...
| Code: | livecd root # raidstart /dev/md0
Couldn't open /etc/raidtab -- No such file or directory |
which is true! I've completely "forgotten" to write my /etc/raidtab file...
Im like okay there should be some way to tell raidstart that my array is made of sda2 and sdb1 with a chunk size of 32k...
So i re-read the man of raidstart and it is possible to use the -c parameter to use another configuration file
So I wrote my raidtab and tryied to use raidstart
but it won't work...
| Code: | livecd root # touch raidtab
livecd root # ls
raidtab
livecd root # nano -w raidtab
livecd root # cat raidtab
raiddev /dev/md0
raid-level 0
nr-raid-disks 2
chunk-size 32
persistent-superblock 1
device /dev/sda2
raid-disk 0
device /dev/sdb1
raid-disk 1
livecd root # raidstart -c ./raidtab
cannot determine md version: no MD device file in /dev.
livecd root # ls /dev
cdrom initctl loop4 ram10 ram7 sdb2 tty11 tty21 tty31 tty41 tty51 tty61 ttyS13 ttyS23 ttyS33 ttyS43 vc vcsa1
cdroms inotify loop5 ram11 ram8 shm tty12 tty22 tty32 tty42 tty52 tty62 ttyS14 ttyS24 ttyS34 ttyS44 vcc vcsa12
console input loop6 ram12 ram9 sndstat tty13 tty23 tty33 tty43 tty53 tty63 ttyS15 ttyS25 ttyS35 ttyS45 vcs vcsa2
core kmem loop7 ram13 random stderr tty14 tty24 tty34 tty44 tty54 tty7 ttyS16 ttyS26 ttyS36 ttyS46 vcs1 vcsa3
fb kmsg mem ram14 rd stdin tty15 tty25 tty35 tty45 tty55 tty8 ttyS17 ttyS27 ttyS37 ttyS47 vcs12 vcsa4
fb0 log null ram15 sda stdout tty16 tty26 tty36 tty46 tty56 tty9 ttyS18 ttyS28 ttyS38 ttyS5 vcs2 vcsa5
fbsplash loop port ram2 sda1 tts tty17 tty27 tty37 tty47 tty57 ttyS0 ttyS19 ttyS29 ttyS39 ttyS6 vcs3 vcsa6
fd loop0 ptmx ram3 sda2 tty tty18 tty28 tty38 tty48 tty58 ttyS1 ttyS2 ttyS3 ttyS4 ttyS7 vcs4 zero
full loop1 pts ram4 sda3 tty0 tty19 tty29 tty39 tty49 tty59 ttyS10 ttyS20 ttyS30 ttyS40 ttyS8 vcs5
hdc loop2 ram0 ram5 sdb tty1 tty2 tty3 tty4 tty5 tty6 ttyS11 ttyS21 ttyS31 ttyS41 ttyS9 vcs6
ide loop3 ram1 ram6 sdb1 tty10 tty20 tty30 tty40 tty50 tty60 ttyS12 ttyS22 ttyS32 ttyS42 urandom vcsa
livecd root # raidstart -c ./raidtab /dev/md0
cannot determine md version: no MD device file in /dev.
livecd root # raid0run
cannot determine md version: no MD device file in /dev.
livecd root # raid0run -c ./raidtab
cannot determine md version: no MD device file in /dev.
livecd root # raid0run -c ./raidtab /dev/md0
cannot determine md version: no MD device file in /dev.
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so yeah thats it basically, im stuck here
any help/idea/suggestion would be appreciated
thank you
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Last edited by Tsuna on Tue Jan 25, 2005 7:59 pm; edited 1 time in total |
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cyrillic
Watchman
Joined: 19 Feb 2003
Posts: 7313
Location: Groton, Massachusetts USA
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| Posted: Tue Jan 25, 2005 2:40 am Post subject: Re: Cannot boot on a Software RAID0 array. |
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| Tsuna wrote: | Upon reboot, this is what I had:
| Code: | md: Autodetecting RAID arrays.
md: autorun ...
md: ... autorun DONE. |
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Is the correct driver for your SCSI card compiled into the kernel ?
Are your harddrives getting detected ?
You should be seeing something like this
| Code: | md: raid0 personality registered as nr 2
md: raid1 personality registered as nr 3
md: md driver 0.90.1 MAX_MD_DEVS=256, MD_SB_DISKS=27
...
md: Autodetecting RAID arrays.
md: autorun ...
md: considering hdg2 ...
md: adding hdg2 ...
md: hdg1 has different UUID to hdg2
md: adding hde2 ...
md: hde1 has different UUID to hdg2
md: created md0
md: bind<hde2>
md: bind<hdg2>
md: running: <hdg2><hde2>
md0: setting max_sectors to 128, segment boundary to 32767
raid0: looking at hdg2
raid0: comparing hdg2(78067776) with hdg2(78067776)
raid0: END
raid0: ==> UNIQUE
raid0: 1 zones
raid0: looking at hde2
raid0: comparing hde2(78067776) with hdg2(78067776)
raid0: EQUAL
raid0: FINAL 1 zones
raid0: done.
raid0 : md_size is 156135552 blocks.
raid0 : conf->hash_spacing is 156135552 blocks.
raid0 : nb_zone is 1.
raid0 : Allocating 4 bytes for hash.
md: considering hdg1 ...
md: adding hdg1 ...
md: adding hde1 ...
md: created md1
md: bind<hde1>
md: bind<hdg1>
md: running: <hdg1><hde1>
raid1: raid set md1 active with 2 out of 2 mirrors
md: ... autorun DONE. |
| Tsuna wrote: | Ok gosh that doesn't look good
So I decided to go back in the LiveCD and see if I could do something.
Once back into the liveCD another question came to me: how to mount /dev/md0 ? I don't have any mdX in /dev !
So I modprobed md and raid0 and /proc/mdstats appeared
Then I searched on google and found raidstart, which is, by chance, on the liveCD, how cool is that |
You can also use mdadm for this, and you don't even need /etc/raidtab for it to work. This should get back the array you previously created.
| Code: | | # mdadm --assemble /dev/md0 --auto=yes /dev/sda2 /dev/sdb1 |
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Tsuna
Tux's lil' helper
Joined: 23 Jan 2005
Posts: 147
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| Posted: Tue Jan 25, 2005 8:20 am Post subject: |
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ok thanks im gonna try that this afternoon after uni
yes I do see my SCSI drives properly detected, the right "modules" are compiled IN the kernel
but its weird I dont see what u have...
we'll see tonight, i'll try get md0 to work from the livecd, fix the raidtab file, make sure it all work and reboot... if it still doesnt work then i wonder what could be wrong with that raid0 array
edit: ok it works, trying to repair my installation.
thank you for your help!
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Tsuna
Tux's lil' helper
Joined: 23 Jan 2005
Posts: 147
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| Posted: Tue Jan 25, 2005 8:00 pm Post subject: |
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ok so I made my raidtab and specified the proper partition type (fd for raid auto detect) and it all works properly
thank you for your support
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pilla
Bodhisattva
Joined: 07 Aug 2002
Posts: 7730
Location: Underworld
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