Hi Guys,
Now that folks are starting to dig into bluestore with the Jewel
release, I wanted to share some of our on-going performance test data.
These are from 10.1.0, so almost, but not quite, Jewel. Generally
bluestore is looking very good on HDDs, but there are a couple of
strange things to watch out for, especially with NVMe devices. Mainly:
1) in HDD+NVMe configurations performance increases dramatically when
replacing the stock CentOS7 kernel with Kernel 4.5.1.
2) In NVMe only configurations performance is often lower at
middle-sized IOs. Kernel 4.5.1 doesn't really help here. In fact it
seems to amplify both the cases where bluestore is faster and where it
is slower.
3) Medium sized sequential reads are where bluestore consistently tends
to be slower than filestore. It's not clear yet if this is simply due
to Bluestore not doing read ahead at the OSD (ie being entirely
dependent on client read ahead) or something else as well.
I wanted to post this so other folks have some ideas of what to look for
as they do their own bluestore testing. This data is shown as
percentage differences vs filestore, but I can also release the raw
throughput values if people are interested in those as well.
https://drive.google.com/file/d/0B2gTBZrkrnpZOTVQNkV0M2tIWkk/view?usp=sharing
Thanks!
Mark
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