I believe splitting will happen on writes, merging I think only happens on deletions. From: Paul Renner [mailto:rennerp78@xxxxxxxxx]
Sent: 10 July 2016 19:40
To: nick@xxxxxxxxxx
Cc: ceph-users@xxxxxxxxxxxxxx
Subject: Re: [ceph-users] Filestore merge and split Do you know when splitting or merging will happen? Is it enough that a directory is read, eg. through scrub? If possible I would like to initiate the process Regards Paul On Sun, Jul 10, 2016 at 10:47 AM, Nick Fisk <nick@xxxxxxxxxx> wrote: You need to set the option in the ceph.conf and restart the OSD I think. But it will only take effect when splitting or merging in the future, it won't adjust the current folder layout.
> -----Original Message-----
> From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of Paul Renner
> Sent: 09 July 2016 22:18
> To: ceph-users@xxxxxxxxxxxxxx
> Subject: [ceph-users] Filestore merge and split
>
> Hello cephers
> we have many (millions, small objects in our RadosGW system and are getting not very good write performance, 100-200 PUTs /sec.
>
> I have read on the mailinglist that one possible tuning option would be to increase the max. number of files per directory on OSDs with
> eg.
>
> filestore merge threshold = 40
> filestore split multiple = 8
> Now my question is, do we need to rebuild the OSDs to make this effective? Or is it a runtime setting?
> I'm asking because when setting this with injectargs I get the message "unchangeable" back.
> Thanks for any insight.
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