[linux-lvm] Performance impact of LVM
Michael T. Babcock
mtb at mikebabcock.ca
Fri Jul 28 14:22:47 UTC 2006
Mark H. Wood wrote:
> However this effect is probably down in the noise for most systems.
> The only way to know if it's a problem for you is to measure. I would
> expect that, given contemporary amounts of caching on the drive, the
> controller, and in the OS, you probably won't see it unless you are
> driving your storage *really* hard. If you do, dump/recreate
> contiguously/restore will make it go away.
For database partitions we always use "lvcreate -C y" when creating LVs
for this reason, for every other area of the system however, I haven't
noticed almost any impact of LVM(1 or 2) except that striping is easier
to set up than using RAID0 because there's no need to repartition.
For example, I often do something like:
lvcreate -C y -n dbdata1 -L 100G mainstore
lvcreate -I 2 -n dbtemp -L 10G mainstore
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