Thread (4 messages) 4 messages, 3 authors, 2010-07-29

Re: MD raid and different elevators (disk i/o schedulers)

From: Mikael Abrahamsson <hidden>
Date: 2010-07-29 10:53:35

On Thu, 29 Jul 2010, Fabio Muzzi wrote:
Is this true? Are there compatibility issues using different i/o 
schedulers with software raid?
I'd actually like to raise this one level further:

In the case of (drives)->md->dm(crypto)->lvm->fs, how do the schedulers, 
readahead settings, blocksizes, barriers etc interact thru all these 
layers? Is block caching done on all layers? Is readahead done on all 
layers?

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se
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