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Re: Problem identified: WAPL/RAIDframe performance problems
On Sat, Dec 01, 2012 at 11:38:55PM -0500, Mouse wrote:
> >>> things. What I care about is the largest size "sector" that will (in
> > ^^^^^^^
> >>> the ordinary course of things anyway) be written atomically.
> >> Then those are 512-byte-sector drives [...]
> > No; because I can do 4K atomic writes, I want to know about that.
> And, can't you do that with traditional drives, drives which really do
> have 512-byte sectors? Do a 4K transfer and you write 8 physical
> sectors with no opportunity for any other operation to see the write
> partially done. Is that wrong, or am I missing something else?
Insert a kernel panic (or power failure(*)) after five sectors and
it's not atomic. One sector, at least in theory(*), is.
(*) let's ignore for now the various daft things that disks sometimes
do in practice.
David A. Holland
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