For the archive's sake:
https://plus.google.com/+GordonMessmer/posts/H5DuyP1LHPU?sfc=false
https://plus.google.com/+GordonMessmer/posts/eSe6iNmk1Fs?sfc=false
During testing, I found that under CentOS 7.2, the default storage
layout for software RAID5 was the worst possible configuration. 512k
blocks perform noticeably worse than 64k blocks, and LVM had a
tremendous impact as well.
After upgrading to CentOS 7.3, which features a newer mpt3sas driver,
performance improved significantly. LVM's overhead has decreased to an
acceptable level (from my point of view).
Because chunk size has a significant impact on performance, I'm going to
file an RFE to change the default chunk size for RAID5 and RAID6 volumes.
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