On 16 May 2014 21:33, Patrik Horník [off-list ref] wrote:

Hello,

I have one more issue with degraded RAID6 array with left-symmetric
layout. When I am reading from RAID6 with 3 active drives from 4 the
operation is CPU bound on decent CPU and I get max seq read cca 50
MB/s. Drives are modern 150 MB/s HDDs.

I did not look into how hard it is to compute data from P / Q yet. Is
it that hard that it needs to consume so much CPU performance or is it
not optimal implementation in md?

Thanks.

Patrik
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'top' or 'htop' or even 'atop'
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