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Re: [linux-lvm] LVM2 seems to chop performance by 33%



Alasdair G Kergon wrote:

On Sun, Jun 20, 2004 at 07:17:58PM +0100, David Greaves wrote:


No-one ever replied as to why blockdev --setra / --getra is not the same as that displayed in lvdisplay
And it's not documented that I can find. There's a comment: "Not used by device-mapper." And that means.....?



Any LVM read ahead setting is ignored by LVM2 i.e. not passed to the kernel.


If it's demonstrated to be useful it could still be implemented, but
the current development priorities are still correctness and new features rather than performance.


Alasdair


Thanks Alasdair

It would be good to modify the docs to be clearer and maybe say "use blockdev --setra"

David
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