[ceph-users] BlueStore questions about workflow and performance

Sam Huracan nowitzki.sammy at gmail.com
Mon Oct 2 15:01:12 PDT 2017


Anyone can help me?

On Oct 2, 2017 17:56, "Sam Huracan" <nowitzki.sammy at gmail.com> wrote:

> Hi,
>
> I'm reading this document:
>  http://storageconference.us/2017/Presentations/CephObjectStore-slides.pdf
>
> 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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