[Lustre-discuss] Client evictions and RMDA failures

[Brian J. Murrell]

On Tue, 2009-03-31 at 11:38 -0400, syed haider wrote:
> Hi Brian,

Hi.

> Thanks for the response. I've run a few ib tests and here is an
> interesting response on the port for a failed node:
> 
> [root at tiger-node-0-1 ~]# ibqueryerrors.pl -c -a -r
> Suppressing: RcvSwRelayErrors
> Errors for 0x0008f104003f0e21 "ISR9288/ISR9096 Voltaire sLB-24"
>    GUID 0x0008f104003f0e21 port 23: [XmtDiscards == 4]
>          Actions:
>           XmtDiscards: This is a symptom of congestion and may require
> tweaking either HOQ or switch lifetime values
> 
>          Link info:      5   23[20]  ==( 4X 2.5 Gbps)==>
> 0x0008f10403970e20    1[  ] "tiger-node-0-11 HCA-1"

FWIW, I have absolutely no idea what any of this means.

> This is interesting because other sources state that my problem is
> possibly related to an over-subscribed network even though there is no
> traffic on the network when these nodes hang. Are you familar with
> what settings need to be tweaked on a voltaire ib switch (9550) to
> possibly resolve this problem?

Not at all.  Probably there are other lists out there with specific I/B
experts to help.  You might also try going right back to your I/B
vendor.

b.

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