[linux-lvm] Wierd lvm2 performance problems
Luca Berra
bluca at comedia.it
Mon Apr 20 05:39:49 UTC 2009
On Sun, Apr 19, 2009 at 05:16:21PM +0200, Sven Eschenberg wrote:
> Unfortunately I don't have the box at hand for 2 days, but I asked md to
> use a chunksize of 2048K and the /proc/mdstat reported 2048K, last time I
> checked.
> The LVM hat a phy-extsize of 2M and with the --dataalignment option set to
> 2M, pvs reported a pe_start value of 2M aswell.
if you have a 2M chunk size, a full stripe is 2M*(N-1), where N-1 is the
number of drives in your array minus redundancy. (i.e. for a 5 drive
raid5 a stripe size would be 8M).
L.
--
Luca Berra -- bluca at comedia.it
Communication Media & Services S.r.l.
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