Juche List,
we have effected one more test:
on the same dom0 we have set up two domUs, one is exporting its
Directory via NFS, the other is mounting it.
This also does not lead to any Problem.
There is no sense in posting something that works, so here is the
Problem that I recently posted and why I effected this other test:
I use NFS to communicate data between dom0 and domU. I export some
folder in dom0 and mount that export as /home in domU
When I write data from domU into /home the system looses its Network
Connection (writing data from domU --> dom0).
Strangely that only happens with files bigger then 200kB. There is no
problem to write e.g. 50 kB into /home.
Hannes
jm-ml schrieb:> Juche List,
>
> here is what I found out today. This Error was reproducable on two
> different machines, and I cannot think of the reason for the Problem,
> maybe I should post it on some NFS list, thats what I''ll try next,
but
> first I try here.
>
> I use NFS to communicate data between dom0 and domU. I export some
> folder in dom0 and mount that export as /home in domU
>
> When I write data from domU into /home the system looses its Network
> Connection (writing data from domU --> dom0).
> Strangely that only happens with files bigger then 200kB. There is no
> problem to write e.g. 50 kB into /home.
>
> I can still login on xm console domU but after some moments the system
> can only be shut down using xm destroy domU.
>
> If I try to recreate domU i get the error:
>
> Using config file "/home/vserver/springfield/start-springfield".
> Error: Unable to connect to xend: Connection refused. Is xend running?
>
> then I have to fully restart dom0. This happens every time.
>
> I am using xen of fedora8 distribution with different clients but the
> problem exists in both cases using a Fedora or gentoo domU.
> I post version Info at the end of the mail.
>
> I have tried a lot of things to get hold of what causes the problem:
>
> In domU i tried to copy data from /home (mounted via NFS) into /root.
> NO PROBLEM, the error only occurs on copying into /home
> dom0(NFS server) <-- domU(NFS client) PROBLEM
> dom0(NFS server) --> domU(NFS client) NO PROBLEM
>
> I also tried it the other way round, but this caused no problem:
> dom0(NFS client) <-- domU(NFS server) NO PROBLEM
> dom0(NFS client) --> domU(NFS server) NO PROBLEM
>
> I also tried to export and mount from localhost for domU and dom0, no
> problem.
> dom0(NFS client) <-- dom0(NFS server) NO PROBLEM
> dom0(NFS client) --> dom0(NFS server) NO PROBLEM
>
> domU(NFS client) <-- domU(NFS server) NO PROBLEM
> domU(NFS client) --> domU(NFS server) NO PROBLEM
>
> I configured NFS export on some other machine on the network and mounted
> this export as /home on my domU. There was no problem copying data of
> any Size in any direction.
>
> It is not only a Problem of copying data into /home the system crashes
> also if I write Data into /home using cat or dd.
>
> It is not a Problem of access rights, I do all the tests as user root,
> and as I wrote above the problem only occurs with writes biger then 200
> kB. With less it works without any Problem.
>
> I tried to setup the NFS export over the bridge of the external IP
> Address, but I also set up an only virtual device "virbr0". The
Problem
> occurs in either cases.
>
> I can copy data of any Size from domU to dom0 using scp or netcat.
>
> I cannot believe it, but all the tests show, that this problem only
> occurs in the one special case described above. Only one direction, only
> on NFS.
>
> Is this a Bug or am I doing anything obviously crazy that I have
> overlooked?
>
> Thank you for your response,
> Hannes
>
> Here some Version Info of the dom0 (the problem occurs independently
> from the domU very different domUs have been tested )
>
> [root@dom0 ~]# /usr/sbin/xm info
> release : 2.6.21-2950.fc8xen
> version : #1 SMP Tue Oct 23 12:24:34 EDT 2007
> machine : i686
> nr_cpus : 2
> nr_nodes : 1
> sockets_per_node : 1
> cores_per_socket : 2
> threads_per_core : 1
> cpu_mhz : 1862
> hw_caps :
> bfebfbff:20100000:00000000:00000140:0000e3bd:00000000:00000001
> total_memory : 2046
> free_memory : 126
> xen_major : 3
> xen_minor : 1
> xen_extra : .0-rc7-2950.fc8
> xen_caps : xen-3.0-x86_32p hvm-3.0-x86_32 hvm-3.0-x86_32p
> xen_scheduler : credit
> xen_pagesize : 4096
> platform_params : virt_start=0xf5800000
> xen_changeset : unavailable
> cc_compiler : gcc version 4.1.2 20070925 (Red Hat 4.1.2-32)
> cc_compile_by : kojibuilder
> cc_compile_domain : (none)
> cc_compile_date : Tue Oct 23 12:22:00 EDT 2007
> xend_config_format : 4
>
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