After running a long series of benchmarks, it looks like there is a very
significant performance difference between systems using LVM and systems
not using LVM under CentOS 7. I'd appreciate it if anyone else can
confirm these results.
There are a couple of other surprising aspects of the results,
especially that the default storage configuration (LVM and 512k blocks)
appears to be the worst configuration possible, when using RAID5 (and
probably RAID6).
https://plus.google.com/+GordonMessmer/posts/H5DuyP1LHPU?sfc=true
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