[Gllug] Raid things

[Rich Walker]

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.

The RAID array comprises the following:

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]

Still, however, on boot /dev/hdf2 is left out of the array:

[   66.809159] md: autorun ...
[   66.809180] md: considering hdk2 ...
[   66.809224] md:  adding hdk2 ...
[   66.809248] md:  adding hdi2 ...
[   66.809272] md:  adding hdg2 ...
[   66.809295] md:  adding hde2 ...
[   66.809316] md: hda1 has different UUID to hdk2
[   66.809376] md: created md1
[   66.809398] md: bind<hde2>
[   66.809416] md: bind<hdg2>
[   66.809435] md: bind<hdi2>
[   66.809453] md: bind<hdk2>
[   66.809471] md: running: <hdk2><hdi2><hdg2><hde2>
[   66.810630] raid5: device hdk2 operational as raid disk 2
[   66.810654] raid5: device hdi2 operational as raid disk 3
[   66.810678] raid5: device hdg2 operational as raid disk 4
[   66.810702] raid5: device hde2 operational as raid disk 1
[   66.811473] raid5: allocated 5235kB for md1
[   66.811498] raid5: raid level 5 set md1 active with 4 out of 5 devices, algorithm 2
[   66.811535] RAID5 conf printout:
[   66.811554]  --- rd:5 wd:4 fd:1
[   66.811574]  disk 1, o:1, dev:hde2
[   66.811594]  disk 2, o:1, dev:hdk2
[   66.811613]  disk 3, o:1, dev:hdi2
[   66.811633]  disk 4, o:1, dev:hdg2

Is there a reason why it ignores /dev/hdf2?

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
www.shadow.org.uk/products/newhand.shtml
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