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tomekki
n00b
Joined: 29 May 2007
Posts: 40
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 Posted: Tue Nov 18, 2008 2:03 pm Post subject: [SOLVED] Software raid is not starting by it self? |
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Hello there,
after booting I need to perform always
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# mdadm -As /dev/md5
mdadm: /dev/md5 has been started with 3 drives.
# cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md5 : active raid5 sdb1[0] sdd1[2] sdc1[1]
976767872 blocks level 5, 64k chunk, algorithm 2 [3/3] [UUU]
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to access my software raid.
Any idea why this is not happen automatically?
thanks, Tomekki
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# cat /etc/mdadm.conf
DEVICE /dev/sd[bcd]1
ARRAY /dev/md5 level=raid5 num-devices=3 UUID=b198e038:fd1a40fa:7e8af8ae:c79c7e1b devices=/dev/sdb1,/dev/sdc1,/dev/sdd1
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mdadm --detail /dev/md5
/dev/md5:
Version : 00.90
Creation Time : Mon Dec 24 09:51:59 2007
Raid Level : raid5
Array Size : 976767872 (931.52 GiB 1000.21 GB)
Used Dev Size : 488383936 (465.76 GiB 500.11 GB)
Raid Devices : 3
Total Devices : 3
Preferred Minor : 5
Persistence : Superblock is persistent
Update Time : Sun Nov 16 21:54:35 2008
State : clean
Active Devices : 3
Working Devices : 3
Failed Devices : 0
Spare Devices : 0
Layout : left-symmetric
Chunk Size : 64K
UUID : b198e038:fd1a40fa:7e8af8ae:c79c7e1b
Events : 0.22696
Number Major Minor RaidDevice State
0 8 17 0 active sync /dev/sdb1
1 8 33 1 active sync /dev/sdc1
2 8 49 2 active sync /dev/sdd1
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Last edited by tomekki on Wed Nov 19, 2008 6:38 am; edited 1 time in total |
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gringo
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Joined: 27 Apr 2003
Posts: 3793
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| Posted: Tue Nov 18, 2008 3:19 pm Post subject: |
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can we have a look to a fdisk -l dev/sdc f.ex. ? did you mark all involved partitions with fd (Linux raid autodetect) ?
cheers
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tomekki
n00b
Joined: 29 May 2007
Posts: 40
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| Posted: Tue Nov 18, 2008 4:51 pm Post subject: |
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| gringo wrote: | can we have a look to a fdisk -l dev/sdc f.ex. ? did you mark all involved partitions with fd (Linux raid autodetect) ?
cheers |
most certainly:
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fdisk -l /dev/sdb
Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x6ad9bXXX
Device Boot Start End Blocks Id System
/dev/sdb1 1 60801 488384001 83 Linux
duo tmk # fdisk -l /dev/sdc
Disk /dev/sdc: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x10bcdXXX
Device Boot Start End Blocks Id System
/dev/sdc1 1 60801 488384001 83 Linux
duo tmk # fdisk -l /dev/sdd
Disk /dev/sdd: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x1a441XXX
Device Boot Start End Blocks Id System
/dev/sdd1 1 60801 488384001 83 Linux
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So no, the type is not Linux raid auto.
Once this array was used with an other gentoo installation, but then, it was mounted automaticly.
I guess it is not save to chnange the partition type on the fly?
Tomekki |
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linuxtuxhellsinki
l33t
Joined: 15 Nov 2004
Posts: 700
Location: Hellsinki
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| Posted: Tue Nov 18, 2008 5:27 pm Post subject: |
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| tomekki wrote: |
I guess it is not save to chnange the partition type on the fly?
Tomekki |
I quess it is, or I haven't got any problems with it and that type is just some byte at mbr, nothing else is written to disk 
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drescherjm
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Joined: 05 Jun 2004
Posts: 2790
Location: Pittsburgh, PA, USA
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| Posted: Tue Nov 18, 2008 5:43 pm Post subject: |
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| Quote: | | I guess it is not save to chnange the partition type on the fly? |
It is safe to do that with fdisk. I have done this many times. Do not delete anything and you will be 100% safe.
I believe it is
t
Then answer partition # question
then
fd
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John
My gentoo overlay
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tomekki
n00b
Joined: 29 May 2007
Posts: 40
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| Posted: Tue Nov 18, 2008 8:42 pm Post subject: |
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After your encouragements I changed the partition type  .
Unfortunately the raid is still not started automaticly after rebooting.
Do you have some other idea?
| Code: |
# fdisk -l /dev/sdb
Disk /dev/sdb: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x6ad9bXXX
Device Boot Start End Blocks Id System
/dev/sdb1 1 60801 488384001 fd Linux raid autodetect
# fdisk -l /dev/sdc
Disk /dev/sdc: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x10bcdXXX
Device Boot Start End Blocks Id System
/dev/sdc1 1 60801 488384001 fd Linux raid autodetect
# fdisk -l /dev/sdd
Disk /dev/sdd: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x1a441XXX
Device Boot Start End Blocks Id System
/dev/sdd1 1 60801 488384001 fd Linux raid autodetect
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honp
Guru
Joined: 25 Sep 2006
Posts: 355
Location: Good old Prague, Czech rep.
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| Posted: Tue Nov 18, 2008 9:43 pm Post subject: |
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| I think you must rebuild the array. |
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drescherjm
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Joined: 05 Jun 2004
Posts: 2790
Location: Pittsburgh, PA, USA
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| Posted: Tue Nov 18, 2008 10:42 pm Post subject: |
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| Quote: | | I think you must rebuild the array. |
You should not have to do that because of the fdisk change.
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minor_prophets
Apprentice
Joined: 07 Oct 2007
Posts: 281
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| Posted: Wed Nov 19, 2008 1:43 am Post subject: |
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| Wouldn't hurt though, no? |
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drescherjm
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Joined: 05 Jun 2004
Posts: 2790
Location: Pittsburgh, PA, USA
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| Posted: Wed Nov 19, 2008 3:19 am Post subject: |
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I believe it is a kernel or udev related problem.
Is the raid456 driver compiled as a module or is it builtin the kernel?
Are you using openrc?
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My gentoo overlay
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tomekki
n00b
Joined: 29 May 2007
Posts: 40
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| Posted: Wed Nov 19, 2008 6:37 am Post subject: |
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| drescherjm wrote: | I believe it is a kernel or udev related problem.
Is the raid456 driver compiled as a module or is it builtin the kernel?
Are you using openrc? |
Yes, I am using openrc.
The driver was compiled as a module. Then, I compiled it into the kernel. Voilà, it works now .
It seems, that the raid is assembled before the modules are loaded.
Thank you for your support!
/Tomekki |
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drescherjm
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Joined: 05 Jun 2004
Posts: 2790
Location: Pittsburgh, PA, USA
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| Posted: Wed Nov 19, 2008 2:43 pm Post subject: |
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| Quote: | | It seems, that the raid is assembled before the modules are loaded. |
That was my guess. Compiling the raid456 into the kernel is the safest option. This is what I do since on all systems (~10) that I am using software raid, my / is on a raid 5 or 6 partition.
As a module you may need to add mdraid to your boot or default runlevel. And update your /etc/conf.d/modules to specifically load the raid456 driver.
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My gentoo overlay
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Last edited by drescherjm on Wed Nov 19, 2008 5:14 pm; edited 1 time in total |
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minor_prophets
Apprentice
Joined: 07 Oct 2007
Posts: 281
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| Posted: Wed Nov 19, 2008 5:04 pm Post subject: |
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| My / is on a RAID 1 and compiled into the kernel as "built-in" as well. |
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