Re: unbelievably bad performance: 2.6.27.37 and raid6

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On Tue, November 3, 2009 5:46 pm, Michael Evans wrote:
>> It is possible to get it fast than it is by increasing the
>> array's stripe_cache_size and also increasing the 'backup' size
>> that mdadm uses.  mdadm-3.1.1 will try to do better in this respect.
>> However it will still be significantly slower than e.g. a resync.
>>
>> NeilBrown
>>
>
> Sorry, one more Q: I was able to find strip_cache_size, and already
> asked about stripe_cache_active (and if setting it to 1 was safe); but
> I can't seem to even find the 'backup' size variable mentioned
> anywhere.  I'm going to start looking at the code next, but is it
> supposed to be in documentation?

It is in the code in mdadm, in 'Grow.c'.
It is called 'blocks' I think.  I'm not sure off hand what the units are.

NeilBrown

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