[ceph-users] BlueStore questions about workflow and performance

Sam Huracan nowitzki.sammy at gmail.com
Mon Oct 2 03:56:37 PDT 2017


I'm reading this document:

I have 3 questions:

1. BlueStore writes both data (to raw block device) and metadata (to
RockDB) simultaneously, or sequentially?

2. From my opinion, performance of BlueStore can not compare to FileStore
using SSD Journal, because performance of raw disk is less than using
buffer. (this is buffer purpose). How do you think?

3.  Do setting Rock DB and Rock DB Wal in SSD only enhance write, read
performance? or both?

Hope your answer,
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