Ah, I see there is an osd parameter for this
osd max write size
Description: The maximum size of a write in megabytes.
Default: 90
> -----Original Message-----
> From: Deneau, Tom
> Sent: Wednesday, April 08, 2015 3:57 PM
> To: 'ceph-users@xxxxxxxxxxxxxx'
> Subject: object size in rados bench write
>
> I've noticed when I use large object sizes like 100M with rados bench write,
> I get
> rados -p data2 bench 60 write --no-cleanup -b 100M
> Maintaining 16 concurrent writes of 104857600 bytes for up to 60 seconds or
> 0 objects
> sec Cur ops started finished avg MB/s cur MB/s last lat avg lat
> 0 0 0 0 0 0 - 0
> 1 3 3 0 0 0 - 0
> 2 5 5 0 0 0 - 0
> 3 8 8 0 0 0 - 0
> 4 10 10 0 0 0 - 0
> 5 13 13 0 0 0 - 0
> 6 15 15 0 0 0 - 0
> error during benchmark: -5
> error 5: (5) Input/output error
>
> An object_size of 32M works fine and the cluster seems otherwise fine.
>
> Seems related to this issue http://lists.ceph.com/pipermail/ceph-users-
> ceph.com/2014-March/028288.html
> But I didn't see a resolution for that.
>
> Is there a timeout that is kicking in?
>
> -- Tom Deneau
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