raid0_make_request bug: can't convert ...bigger than 8k

raid0_make_request bug: can't convert ...bigger than 8k

[Paul Kubicz]

I'm getting a message like this when trying to compile raid into the 
2.5.x kernel (up to 2.5.21). I've picked up several semi-relevant 
messages in a search, but I couldn't find anything that directly 
addresses the problem.

I'm trying to mount md0 created under kernel 2.4.x. Thanks for any help.

recovery of software raid0

[Maxwell Bottiger]

So, my system was hacked today and everything is a mess.  I need to get to
two raid 0 partitions and recover the data off of them before I wipe and
clean the system.

The problem is that I have no root partition or much of any other system
directories.  It appears all my raid partitons are in good shape, but I
need to mount them from something like my rescue disk.  How can I go about
doing this?  I no longer have a raidtab or fstab, but I know which
partitons go together and I'm 99% sure they all have persistant
superblocks so they shoud be easily reccognized.

If this is simply a matter of putting in a temporary raidtab file could
someone please send me a sample one?  Also, would someone please give me
an example of what arguments to give mount in order to mount the disks
propperly.

If it is possible to get back to me about this quickly please do.  I
really need to get this box back online, everything I have is in those
home directories.


Maxwell (SleepyLight) Bottiger
Theatre and Computer Science Undergrad at UMBC
       (o_   (o_
  (o_  //\   //\
  (/)_ V_/_  V_/_  If at first you don't succeed, redefine success.

Re: recovery of software raid0

[ewitness - Ben Fowler]

At 6:06 pm -0400 14/6/02, Maxwell Bottiger wrote:
>So, my system was hacked today and everything is a mess.  I need to get to
>two raid 0 partitions and recover the data off of them before I wipe and
>clean the system.
>
>The problem is that I have no root partition or much of any other system
>directories.  It appears all my raid partitons are in good shape, but I
>need to mount them from something like my rescue disk.  How can I go about
>doing this?  I no longer have a raidtab or fstab, but I know which
>partitons go together and I'm 99% sure they all have persistant
>superblocks so they shoud be easily reccognized.

I am sorry to hear of your misfortune. Please do nothing hasty, and
if possible get advice from someone who has been through this. There is
a good chance that you can get almost all of your home directory
back, given time.

First, if you have the install CD from a modern SuSE distribution,
you may find that it will recognise the RAID and partitions.

>If this is simply a matter of putting in a temporary raidtab file could
>someone please send me a sample one?  Also, would someone please give me
>an example of what arguments to give mount in order to mount the disks
>propperly.

Yes. I suspect that you need a raidtab. You are outside the area
that I can work from by remote control, but I presume that you can
boot from Tom's Root and Boot Disk or your distribution's install
CD and dummy up a raidtab.

You will be lucky if anything mounts. If you are using Reiser's
FS you recover your data by scavenging otherwise open the device
in a file system debugger.

Wait for someone else to confirm and/or give more detail.

'Phone a friend' as they say, and bribe him or her with, say,
coffee molecules. Recovery from this is time consuming and
tedious, but should be possible.

>If it is possible to get back to me about this quickly please do.  I
>really need to get this box back online, everything I have is in those
>home directories.

Online?

Don't take action too quickly - more haste less data!

Ben.

Re: raid0_make_request bug: can't convert ...bigger than 8k

[Neil Brown]

On Friday June 14, pkube@umich.edu wrote:
> I'm getting a message like this when trying to compile raid into the 
> 2.5.x kernel (up to 2.5.21). I've picked up several semi-relevant 
> messages in a search, but I couldn't find anything that directly 
> addresses the problem.

That would be because the problem hasn't been addressed yet...  I'm
afraid you will have to live without raid0 (and probably linear) in
2.5 kernels for a while longer.

NeilBrown

> 
> I'm trying to mount md0 created under kernel 2.4.x. Thanks for any help.
> 
> 
> 
> 
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Re: raid0_make_request bug: can't convert ...bigger than 8k

[Paul Kubicz]

Thanks, Neil; fair enough. About what one could expect from a testing 
kernel, I guess.

I will add that the problem seemed to occur with all raids though (at 
least in my setup), not just raid0, so raiders beware...


Neil Brown wrote:

>On Friday June 14, pkube@umich.edu wrote:
>  
>
>>I'm getting a message like this when trying to compile raid into the 
>>2.5.x kernel (up to 2.5.21). I've picked up several semi-relevant 
>>messages in a search, but I couldn't find anything that directly 
>>addresses the problem.
>>    
>>
>
>That would be because the problem hasn't been addressed yet...  I'm
>afraid you will have to live without raid0 (and probably linear) in
>2.5 kernels for a while longer.
>
>NeilBrown
>  
>