[Users] NFS troubleshooting page

[Itamar Heim]

On 09/09/2013 01:53 PM, Markus Stockhausen wrote:
> Hello,
>
> although it helps nobody I just want to leave the information that
> my first two weeks with ovirt were horrible. That said I'm still
> confident that I will able to get it all managed.
>
> For know I have some addition to the NFS troubleshooting wiki
> that could be helpful for others. My wiki account request is still
> pending so maybe someone with access could expand the page.
>
> NFS mounts on the hypervisor hosts (at least Fedora 19) use the
> option rsize=1M,wsize=1M by default. If the NFS servers maximum
> tcp window memory settings are less or equal than 1M the
> connections to NFS data/ISO domains may stall from time to time.
>
> Raising the TCP kernel settings on NFS server side to
>
> net.ipv4.tcp_mem = 4096 65536 4194304
> net.ipv4.tcp_rmem = 4096 65536 4194304
> net.ipv4.tcp_wmem = 4096 65536 4194304
>
> helps to get things stable.

ayal/federico - thoughts on how we can make things better? warn? etc?