don Paolo Benvenuto
donpaolo at gsi.it
Wed Jan 31 10:29:49 GMT 2007
El mié, 31-01-2007 a las 09:28 +0000, Gavin McCullagh escribió:
> > Since two weeks I have a big problem with my edubuntu ltsp installation.
> > All were working without problem, but the hd failed, and I have to
> > reinstall all the stuff.
> Just to be clear what has changed:
> - What version of Edubuntu were you running before and what version are
> you running now after reinstall? Was your previous version upgraded or
> did you install that version directly.
I was running edgy, upgrade from dapper, upgraded from hoary, and now
againg, edgy upgraded from dapper installed from the cd
> - This is still the same physical server, right?
> - You replaced a hard disk. Was this with an identical new hard disk or
> did something change? Are you still using the same disk controller? Is
> it IDE, SATA or SCSI? Are you using RAID of any sort?
no, all the same: SATA
> > Normally I mantain the server all the time swithced on. When I boot the
> > clients in the morning, almost all boot up, one or two don't boot and
> > they stop with an arror in the nfs mounting, so that the busybox shell
> > appears.
> > But if I switch the clients off and boot them again, almost all don't
> > boot, and stop with the nfs mounting problem.
> Did all thin clients always boot before you reinstalled or did you see this
> problem sometimes and now it's got much worse?
no, before the reinstall all the clients booted without problems
> If you boot each client one at a time, do you get less failures than if you
> boot many together? Can you get back to most clients working by rebooting
> the server or restarting the nfs server?
> sudo /etc/init.d/nfs-kernel-server restart
> > I'm quite sure it's not a software problem, and I was wondering if it
> > could be a hardware one. So that I ask you: how do I realize what is
> > failing? What should I check?
> On the server, you could
> 1. check the output of the command dmesg for errors.
the only thing I see is that for eth0 (the nic of the clients there is a
eth0: Setting full-duplex based on MII#1 link partner capability of
but there isn't a line like " eth1: ADMtek Comet rev 17 at Port 0xb800,
00:08:A1:A0:6C:1D, IRQ 74.":
dmesg |grep eth
[17179593.904000] eth1: ADMtek Comet rev 17 at Port 0xb800,
00:08:A1:A0:6C:1D, IRQ 74.
[17179593.984000] eth1: setting full-duplex.
[17179596.932000] eth0: Setting full-duplex based on MII#1 link partner
capability of 45e1.
[17179624.224000] eth1: no IPv6 routers present
[17179624.744000] eth0: no IPv6 routers present
> 2. check the logfiles, particularly /var/log/syslog and /var/log/messages
> for errors
I can't see anything significant
> 3. look at the output of "/sbin/ifconfig" and look at the error count. It
> should generally be zero.
there are 2 errors on the interface of the clients
> 3. look at the output of
> sudo /usr/sbin/ethtool eth0
> to see what speed the NIC is negociated at, etc.
$ sudo /usr/sbin/ethtool eth0
Settings for eth0:
No data available
Then is it a problem with the nic?
On the contrary:
$ sudo /usr/sbin/ethtool eth1
Settings for eth1:
Supported ports: [ TP MII ]
Supported link modes: 10baseT/Half 10baseT/Full
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
Advertised auto-negotiation: Yes
Current message level: 0x00000001 (1)
Link detected: yes
> > My net wiring: the server's nic is connected to two 24-ports switches
> > (D-Link), and every switch is connected to 20 clients, 40 clients for
> > all.
> > When the problem appears, it affects the clients of both switches.
> Is everything 100Mbit/sec or have you some Gigabit (or 10Mbit/s) equipment?
> I presume one switch plugs into the other which does create a bottleneck
> for the switch further away from the server. This would not have been new
> after a reinstall though.
> > If a client doesn't boot, preferebly isn't one of the clients nearest to
> > server.
> You mean the clients nearer the server boot correctly more reliably than
> those further away? Do those machines have something in common, eg type of
> machine, what switch they're on?
The nearest clients are on the same switch, but all the clients are the
don Paolo Benvenuto
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