[ale] networking backpressure

[Jim Kinney]

Agreed. V4 is preferred. Currently, server is winders 2008 serving NFS. Bad
setup getting replaced.
On Apr 10, 2013 12:13 AM, "George Allen" <glallen01 at gmail.com> wrote:

> Maybe using NFS over TCP instead of UDP may help? Over TCP the dropped
> packets will cause the window size to increase, which would 'dial
> down' the two clients after the initial overflow.
>
> On Tue, Apr 9, 2013 at 10:02 PM, Jim Kinney <jim.kinney at gmail.com> wrote:
> > Migrating asap to zfs for arrays and still NFS4 for share and adding 10G
> > Ethernet. Zfs likes NFS and supports it directly.
> >
> > On Apr 9, 2013 9:35 PM, "Scott McBrien" <smcbrien at gmail.com> wrote:
> >>
> >> Sounds like you guys need to move to either a solution other than NFS or
> >> change your server to something like a NetApp filer or another such
> device
> >> that's had it's NFS stack monkeyed with to support more volume.
> >>
> >> -Scott
> >>
> >> On Apr 9, 2013, at 9:20 PM, Chuck Payne <terrorpup at gmail.com> wrote:
> >>
> >> Jim,
> >>
> >> Sounds like the same issue I having. Driving me crazy to fix it. I got a
> >> script doing a ifconfig down and then an up and that works, but it a
> >> bandage.
> >>
> >> My mounts are soft.
> >>
> >> I have Gig cards and Gig Switches.
> >>
> >> I will follow this to see it helps with my issue.
> >>
> >> Pup
> >>
> >>
> >>
> >>
> >> On Tue, Apr 9, 2013 at 3:08 PM, JD <jdp at algoloma.com> wrote:
> >>>
> >>> On 04/09/2013 02:33 PM, Mike Harrison wrote:
> >>> > On Tue, 9 Apr 2013, Jim Kinney wrote:
> >>> >> so what happens when a series of machines, each with 1G nic all try
> to
> >>> >> read/write to the same NFS mount filesystem,
> >>> >> also on a single 1G nic, and this goes on for hours at a time?
> >>> >> Eventually, nic
> >>> >> buffers fill and the OS is told to "hold that thought". But for how
> >>> >> long? Will
> >>> >> the OS continue to try
> >>> >> the write until it succeeds? Or will the constant buffer overload
> just
> >>> >> cause a
> >>> >> nic to flush the buffer and hope for
> >>> >> better luck next send?
> >>>
> >>> My use of NFS is a little dated ... seems it would depend on the type
> of
> >>> mount
> >>> used - spongy, soft, or hard.
> >>> If hard, it will try again and again and will appear to lockup the
> >>> machine, IME.
> >>> With soft mounts, writes aren't guaranteed.
> >>> Spongy has the good of hard and the good of soft mounts. It will give
> up
> >>> after a
> >>> specific amount of time and continue as best it can - providing errors
> as
> >>> required.  NFS mounts have lots of tunable params, if I recall
> correctly.
> >>>
> >>> Also, the specific buffer size for the involved NICs would matter too,
> >>> but
> >>> filling a network buffer should happen relatively quickly.
> >>> _______________________________________________
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> >>
> >>
> >>
> >>
> >> --
> >> Terror PUP a.k.a
> >> Chuck "PUP" Payne
> >>
> >> (678) 636-9678
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> >>
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> >>
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> >>
> >
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> >
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