[Beowulf] quick note on Redhat NFS issues with NAS units
agrajag at dragaera.net
Tue Dec 28 09:44:54 EST 2004
Joe Landman wrote:
> Been looking into why a Redhat EL3 WS x86_64 client hangs when
> accessing a NAS based upon SuSE 9x. Turns out there are two
> problems. I can reliably cause the problem to appear/dissappear on my
> test hardware, and I thought others on this group would like to see
> what I did to make the problems dissappear.
> Problem manifests itself with RedHat EL3 WS x86_64 clients. I have
> not been able to replicate it with non-RHEL3 based clients, on the
> same hardware, including FC2/FC3/Ubuntu/SuSE9x/... Problem does not
> show up in 32 bit mode from what I can tell (need more testing but
> preliminary data seems to support this). Motherboard are Tyan s288x
> units. All have the Broadcom chipset ethernets.
> By default RedHat installs tg3 kernel modules to drive these chips.
> I have not been able to make the problem go away using the tg3
> driver. So I replaced the tg3 driver with the bcm570x driver from
> Broadcom's download site. This did not make the problem go away,
> though NFS mount now respected the intr option (did not with the tg3).
> Next, I changed from udp to tcp. The original fstab line was
> 192.168.2.17:/big /big nfs udp,intr,bg 0 0
> and the new one is
> 192.168.2.17:/big /big nfs
> tcp,intr,bg,wsize=32768,rsize=32768 0 0
> MTU changes did not affect the results (though they did improve on
> some of the test timing).
I'm successfully using RHEL3 x86_64 NFS clients mounting from a RHEL3
x86 server. My only options are 'rsize=8192,wsize=8192', and jumbo
frames are enabled.
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