2.6.0-test1 ltsp server nfs problem

2.6.0-test1 ltsp server nfs problem

[Jean-Denis Girard]

Hi,

We are running our office in a LTSP environment.

I installed 2.6.0-test1 on the server only, and it seems to work fine
(I'm sending this mail from this server), but my LTSP thin clients can
no longer mount their root partition. I get:

...
Mounting root filesystem: ... from: ...
Doing the pivot_root
nfs: nfs server ... not responding, still trying
nfs: task 83 can't get a request slot

And then nothing more...

On the server side /proc/net/rpc/*/content gives (client above is vpn1)
#class IP domain
nfsd 192.168.10.21 stb1.esoft.pf
nfsd 192.168.10.22 stb2.esoft.pf
nfsd 192.168.10.13 mahana.esoft.pf
nfsd 192.168.10.127 vpn1.esoft.pf
#path domain(flags)
/opt/ltsp/i386  mahana.esoft.pf(ro,no_root_squash,sync,wdelay)
/opt/ltsp/i386  stb2.esoft.pf(ro,no_root_squash,sync,wdelay)
/opt/ltsp/i386  vpn1.esoft.pf(ro,no_root_squash,sync,wdelay)
/opt/ltsp/i386  stb1.esoft.pf(ro,no_root_squash,sync,wdelay)
#domain fsidtype fsid [path]
stb1.esoft.pf 0 0x01000300 /opt/ltsp/i386
vpn1.esoft.pf 0 0x01000300 /opt/ltsp/i386
stb2.esoft.pf 0 0x01000300 /opt/ltsp/i386
mahana.esoft.pf 0 0x01000300 /opt/ltsp/i386

I can mount the same nfs share from another system (non LTSP) without
trouble. Nothing has changed on the client side which is straight
LTSP-3.0 (kernel 2.4.19-ltsp-1).

Server basically is a Mandrake-9.1 system, with nfs-utils-1.05
(recompiled from sources from nfs.sf.net).

What other details should I send ?

Thanks for any help.



-- 
Jean-Denis Girard

====================================================
Essential Software - Ingénierie Informatique
Solutions Linux & Open Source en Polynésie française
----------------------------------------------------
http://www.esoft.pf/
Tél: (689) 54 12 95
====================================================







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Re: 2.6.0-test1 ltsp server nfs problem AND closed lists issues

[Neil Brown]

On Tuesday July 22, jd-girard@esoft.pf wrote:
> Hi,
> 
> We are running our office in a LTSP environment.
> 
> I installed 2.6.0-test1 on the server only, and it seems to work fine
> (I'm sending this mail from this server), but my LTSP thin clients can
> no longer mount their root partition. I get:
> 
> ...
> Mounting root filesystem: ... from: ...
> Doing the pivot_root
> nfs: nfs server ... not responding, still trying
> nfs: task 83 can't get a request slot
> 
> And then nothing more...

Jean-Denis sent this to the list because I asked him too.  I like all
questions and answers to go through the list so that information is
spread around and publicly archived.
But he got an 'awaiting moderator approval' and so resent it to me and
we ended up completely resolving the issue before the moderator got
around to forwarding this original to the list :-(

I am really quite unimpressed with the idea of have the list closed to
non-subscribers.   I appreciate that some see spam as a problem and I
am happy for it to be addressed but I DON'T think closing the list is
an appropriate response.


Anyway, the result of the problem was that with 2.6.0-test1, the
server was willing to handle 32K reads, to the client tried 32K reads,
and some bit of the network did not succeed in letting a 32K UDP
packet (about 20 IP fragments) get back to the client completely.
Using a mount option of
    rsize=8192
resolved the problem.

Possibly one for the FAQ...

NeilBrown


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