Neil,
First, I just want to emphasize that the message "raid array is not
clean" from the kernel log
appeared after running "mdadm create". (and not "mdadm stop" or "mdadm
assemble")
I don't know if it is normal behavior. (Is it ? this is in fact my question).
one little think: I ran here also mkfs -t ext3... but also
tried without it and it was teh same.
Second, here is exactly what I did and the kernel log :
My actions:
dd if=/dev/zero of=/dev/sda bs=1M count=64
===
create 2 linux raid partitions equal in size:
afterwards:
fdisk -l /dev/sda shows:
Disk /dev/sda: 65 MB, 65470464 bytes
3 heads, 42 sectors/track, 1014 cylinders
Units = cylinders of 126 * 512 = 64512 bytes
Device Boot Start End Blocks Id System
/dev/sda1 1 256 16107 fd Linux raid autodetect
/dev/sda2 257 513 16191 fd Linux raid autodetect
===
modprobe raid1
mdadm --create /dev/md0 --level=raid1 --raid-devices=2 /dev/sda1 /dev/sda2
mdadm: array /dev/md0 started.
cat /proc/mdstat
cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda2[1] sda1[0]
16000 blocks [2/2] [UU]
unused devices: <none>
===
mkfs -t ext3 /dev/md0
mdadm --stop /dev/md0
cat /proc/mdstat
Personalities : [raid1]
unused devices: <none>
---
mdadm --assemble /dev/md0 /dev/sda1 /dev/sda2
mdadm: /dev/md0 has been started with 2 drives.
The kernel log
============
Oct 11 14:43:53 kernel: md: bind<sda1>
Oct 11 14:43:53 kernel: md0: WARNING: sda2 appears to be on the same
physical disk as sda1. True
Oct 11 14:43:53 kernel: protection against single-disk failure
might be compromised.
Oct 11 14:43:53 kernel: md: bind<sda2>
Oct 11 14:43:53 kernel: md: md0: raid array is not clean -- starting
background reconstruction
Oct 11 14:43:53 kernel: raid1: raid set md0 active with 2 out of 2 mirrors
Oct 11 14:43:53 kernel: md: syncing RAID array md0
Oct 11 14:43:53 : md: minimum _guaranteed_ reconstruction speed: 1000
KB/sec/disc.
Oct 11 14:43:53 : md: using maximum available idle IO bandwidth (but
not more than 200000 KB/sec) for reconstruction.
Oct 11 14:43:53 : md: using 128k window, over a total of 16000 blocks.
Oct 11 14:44:29 : md: md0: sync done.
Oct 11 14:44:34 : RAID1 conf printout:
Oct 11 14:44:34 : --- wd:2 rd:2
Oct 11 14:44:34 : disk 0, wo:0, o:1, dev:sda1
Oct 11 14:44:34 : disk 1, wo:0, o:1, dev:sda2
===
after mdadm stop:
---
Oct 11 14:46:53 : md: md0 stopped.
Oct 11 14:46:53 : md: unbind<sda2>
Oct 11 14:46:53 : md: export_rdev(sda2)
Oct 11 14:46:53 : md: unbind<sda1>
Oct 11 14:46:53 : md: export_rdev(sda1)
====
after mdadm assemble:
---
Oct 11 14:48:15 : md: md0 stopped.
Oct 11 14:48:15 : md: bind<sda2>
Oct 11 14:48:15 : md0: WARNING: sda1 appears to be on the same
physical disk as sda2. True
Oct 11 14:48:15 : protection against single-disk failure might be
compromised.
Oct 11 14:48:15 : md: bind<sda1>
Oct 11 14:48:15 : raid1: raid set md0 active with 2 out of 2 mirrors
Regards,
Ian
On 10/10/06, Neil Brown <neilb@xxxxxxx> wrote:
On Monday October 9, ianbrn@xxxxxxxxx wrote:
>
> In the kernel log I see:
> "md0: raid array is not clean -- starting background reconstruction"
>
>
> What is the meaning of "raid array is not clean" ?
It means md believe there could be an inconsistency in the array.
This typically happens due to an unclean shutdown.
Can you post more complete logs ? 100 lines either side should be
plenty.
NeilBrown
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