[Labs-l] NFS issues

[Ken Snider]

FYI. Thanks for the update, Marc!


--Ken.

(Sent from iPhone)

On 2013-07-18, at 1:13 PM, "Marc A. Pelletier" <marc at uberbox.org> wrote:

> Some of you may have noticed some annoyance with the NFS filesystems
> lately.  While we seem to have successfully solved the problem that had
> it crash completely every 14 days, there is a lingering issue with the
> controller on the file server that causes intermittent stalls in the
> disk IO.
>
> In practice, this should have no impact on your running tools (or
> interactive session) except for disk access "freezing" for periods of
> 2-3 minutes at irregular intervals.  The amount of stalls seem to be
> related to write traffic, but never gets much worse than 2-3 times per
> hours (annoying though they be).
>
> In an attempt to solve the issue this afternoon, I tweaked some driver
> settings on the file server but accidentally brought the filesystems
> back up in the wrong order, making files appearing unavailable for a
> brief period (12s) and necessitating a reboot of the Tool Labs cluster.
>
> Sadly, this was in vain since the underlying issue remains.  It is not
> yet clear if the issue is caused by the driver or a hardware problem,
> but my efforts remain focused on solving the issue for good.
>
> In the meantime, I thank you for your patience as performance remains
> impacted.
>
> -- Marc
>
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