[ceph-users] osd max write size and large objects

Wido den Hollander wido at 42on.com
Thu Nov 16 07:41:33 PST 2017


> Op 16 november 2017 om 16:32 schreef Robert Stanford <rstanford8896 at gmail.com>:
> 
> 
>  Once 'osd max write size' (90MB by default I believe) is exceeded, does
> Ceph reject the object (which is coming in through RGW), or does it break
> it up into smaller objects (of max 'osd  max write size' size)?  If it
> breaks them up, does it read the fragments in parallel when they're
> requested by RGW?
> 

The OSD rejects the write. However, RGW already does striping over RADOS objects.

Usually you don't need to worry about this setting unless you are talking to RADOS directly.

However, 90MB objects are big and you should look into libradosstriper.

Wido

>  Thanks
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