[CentOS] to lvm or not to lvm - why/when to use lvm

[John R Pierce]

On 9/27/2013 9:39 AM, Phil Gardner wrote:
> So we can generally say that LVM offers no real drawbacks in terms of
> flexibility, but it seems like we are mostly talking about homebrew setups.
>
> What about in a high iops situation? Is there any evidence/testing out
> there that might show that there is some overhead of LVM that might
> impact total throughput?

I ran quite a lot of disk IO benchmarks awhile back on both JBOD and 
hardware raid SAS configurations with high performance 15000 rpm drives 
as well as 7200rpm nearline drives... I found zilch significant 
difference between using a direct file system and LVM with either ext4fs 
or xfs.   what differences i saw were down in the statistical noise and 
not repeatable.


-- 
john r pierce                                      37N 122W
somewhere on the middle of the left coast