> -----Original Message-----
> From: ceph-users [mailto:[email protected]] On Behalf Of
> Christian Balzer
> Sent: 19 August 2015 03:32
> To: [email protected]
> Cc: Nick Fisk <[email protected]>
> Subject: Re: [ceph-users] any recommendation of using EnhanceIO?
>
> On Tue, 18 Aug 2015 20:48:26 +0100 Nick Fisk wrote:
>
> [mega snip]
> > 4. Disk based OSD with SSD Journal performance As I touched on above
> > earlier, I would expect a disk based OSD with SSD journal to have
> > similar performance to a pure SSD OSD when dealing with sequential
> > small IO's. Currently the levelDB sync and potentially other things
> > slow this down.
> >
>
> Has anybody tried symlinking the omap directory to a SSD and tested if hat
> makes a (significant) difference?
I thought I remember reading somewhere that all these items need to remain
on the OSD itself so that when the OSD calls fsync it can be sure they are
all in sync at the same time.
>
> Christian
> --
> Christian Balzer Network/Systems Engineer
> [email protected] Global OnLine Japan/Fusion Communications
> http://www.gol.com/
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