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Could someone elaborate on what it means to 'serialize' the historically long call chains associated with block devices + lvm2 + nfs + firewall, etc?
Most of these calls have since been serialized?
Posted Nov 17, 2005 15:46 UTC (Thu) by fenrus (guest, #31654)
XFS -> function -> dm layer -> function -> dm layer -> function -> raid layer -> function -> scsi layer -> driver
(well theoretical example but you get the idea I hope)
in the new situation, instead of calling the function again, you return "do again" so it goes like
XFS -> function -> dm layer -|
function -> dm layer -|
function -> raid layer -|
function -> scsi layer -> driver
so the max depth is 4 (well real world is slightly more complex) independent on how often you layer this. In the old situation you could layer a lot and go really big (11 in the example, but just layer more and it goes higher)
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