[Gllug] Raid things

[Rich Walker]

Huw Lynes <huw-l at moving-picture.com> writes:

> On Thu, 2005-11-03 at 14:49 +0000, Rich Walker wrote:
>> Hi,
>> 
>> Some time ago, I posted a query about performance of an NEC DVD-RW on an
>> ALI IDE chipset. The suggestion at the time was "move to a 2.6 kernel."
>> 
>> For various reasons to do with problems with interaction between LVM and
>> MD, I've only just done this, but it worked a treat: burning DVD's no
>> longer brings the machine to a halt.
>> 
>> The problem with the interaction between LVM and MD was (mostly) fixed
>> by telling LVM to exclude the RAID array components - now that bit no
>> longer breaks horribly.
>
>> 
>> Is there a reason why it ignores /dev/hdf2?
>
> can you post /proc/mdstat?


rw at thoth:/big/linux/thoth/linux-2.6.14$ cat /proc/mdstat 
Personalities : [linear] [raid0] [raid1] [raid5] [multipath] [raid6] [faulty] 
md1 : active raid5 hdf2[0] hdk2[2] hdi2[3] hdg2[4] hde2[1]
      638904576 blocks level 5, 32k chunk, algorithm 2 [5/5] [UUUUU]
      
md0 : active raid1 hda1[0]
      19583168 blocks [2/1] [U_]
      
unused devices: <none>

(md0 is (hopefully) not relevant - it's a left-over on the boot disk).

> And what happens if you manually add /dev/hdf2 using mdadm?
>
> e.g:
>
> mdadm --manage /dev/md[whatever] --add /dev/hdf2

That's what I do after every boot at the moment. Then I get to wait 3
hours for the re-sync...

cheers, Rich.

-- 
rich walker         |  Shadow Robot Company | rw at shadow.org.uk
technical director     251 Liverpool Road   |
need a Hand?           London  N1 1LX       | +UK 20 7700 2487
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