Process take long time to write to NFS filesystem.

[Eugene Vilensky]

On Sat, Jan 2, 2010 at 4:50 PM, Eugene Vilensky <evilensky at gmail.com> wrote:
> On Sat, Jan 2, 2010 at 4:18 PM, unix syzadmin <unixsyzadmin at gmail.com> wrote:
>> We are using a export from NetApp V-Series V3070 appliance.
>> We don't have access and I do not know anything more about this.
>
> For starters, your mount options are not what is specified by NetApp
> for a Linux kernel NFS client.  Check the NetApp documentation for
> correct mount options.
>
> In general terms, do you know if you have enough back-end spindles
> dedicated to this workload?   df output should be nearly
> instantaneous.
>
> Is this a dedicated GigE or better network?  Are jumbo frames enabled?
>  Are proper flow-control settings enabled on the switchports and
> storage system?
>
> How many local disks do you have when you test this application with local disk?
>
> It sounds like you have an improperly setup/functioning storage system
> serving your NFS.  I would investigate this thoroughly first and
> follow proper recommendations from your storage vendor.

Also what is the output of df for this particular volume?  What about
the storage aggregate?  For NetApp you need some free space inside the
volume, so that you are not stuck waiting for free space to be created
from deleted files (it takes time for blocks to be freed after a DEL),
and also plenty of free space at the aggregate level for new writes.