On Jul 23 2015, [email protected] wrote:
> Hello,
>
> I would like to know if somebody has already have this problem.
> This is my configuration :
> - Server A : use S3QL (Openstack backend) + export NFS
> - Client B : client NFS (version 4)
>
> When I copy a huge file (>4 Go) from "client B" to "server A" through NFS I
> have a high load (> 7) on server A.
> But when I copy the same file directly on server A (to the mounted S3QL
> filesystem), there is no load.
> When I copy a huge file from client B to server A without the mounted S3QL
> filesystem on server A (through NFS only), there is no load.
>
> Do you know why S3QL + NFS export produce high load on my situation ?
Probably NFS uses a very small block size when writing to S3QL.
Either convince your NFS server to use a larger block size (may require
a kernel patch), or use a kernel with FUSE writeback cache support
(probably requires a small change to llfuse to enable it).
Best,
-Nikolaus
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