Re: [RAID1 Bug] bio too big device md0 (248 > 200) (2.6.9-rc2-mm1)

["Raphaël Rigo" <raphael.rigo@twilight-hall.net>]

Neil Brown wrote:
> On Monday September 20, raphael.rigo@twilight-hall.net wrote:
> 
>>Hello,
>>kernel version : 2.6.9-rc2-mm1
>>i'm using a RAID1 array over 2 disks : one ATA, and another one in 
>>"SATA" (if we can call the ICH5 a real SATA controller).
>>During array synchronisation, I get "bio too big device md0 (248 > 200)" 
>>error, which I fixed in doing
>>//#define RESYNC_BLOCK_SIZE (64*1024)
>>#define RESYNC_BLOCK_SIZE PAGE_SIZE
>>in raid1.c, following the instruction on an old thread (for kernel 2.6.0).
>>I would like to know if there is any better fix now, else then this mail 
>>  will act as a remainder ;)
> 
> 
> This is not (as far as I can tell) a raid1 bug.
> 
>    bio too big device md0
> 
> means that someone sent a request to md0 that was too large. (124K
> instead of the max 100K).
> 
> raid1 never does that.  It send requests to the underlying devices.
> So if you make your raid1 from hde and sda, then a message like
>    bio to big device sda
> might indicate a problem with raid1.
> 
> Are you sure you quoted the error message correctly?
> If you, how was the array being used? What filesystem?
> 
> NeilBrown
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Is I am sure I did the right quote (copy paste from kern.log).
The array was being recovered (it is a newly created array), copying 
from hda to sda. The filesystem used is ext3.
Btw the first number in the message did vary.

I did the modification in raid1.c based on this mail you wrote :
http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&frame=right&th=69e566d020ab2da6&seekm=Pine.LNX.4.58.0312232253140.7841%40infocalypse.jimlawson.org.lucky.linux.kernel#link5

Hope this helps,

Raphaël Rigo