[ale] networking backpressure

[Jim Kinney]

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
>
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