Re: SSD Journal Performance Priorties

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You need to make sure SSD O_DIRECT|O_DSYNC performance is good. Not all the SSDs are good at it..Refer the prior discussions in the community for that.

<< Presumably as long as the SSD read speed exceeds that of the spinners, that is sufficient.
You probably meant write speed of SSDs ? Journal will not be read in the IO path , it will be read only during journal replay at the time of OSD restart..

Thanks & Regards
Somnath

-----Original Message-----
From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Lindsay Mathieson
Sent: Friday, February 26, 2016 4:16 PM
To: ceph-users@xxxxxxxxxxxxxx
Subject:  SSD Journal Performance Priorties

Ignoring the durability and network issues for now :) Are there any aspects of a journals performance that matter most for over all ceph performance?

i.e my inital thought is if I want to improve ceph write performance journal seq write speed is what matters. Does random write speed factor at all?

Presumably as long as the SSD read speed exceeds that of the spinners, that is sufficient.

--
Lindsay Mathieson

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