I have a "diskless" client that boots from LTSP. The
client runs a program locally that talks through the
serial port to a measuring device. Normally the LAN
connection will be up but the server can go down on
occasion or the network may go down on occasion. In
practice an interruption of either the server or the
LAN stop the program, which writes to a local ramdisk.
This is undesireable because the measurements need to
be continuous.
Here's what I see:
The root (/) the client is the /opt/ltsp/i386/ of the
server which is accessed via the network..
Inside the root is the /mnt subdirectory.
I created a ramdisk (/dev/ram0), did the mkfs y
mounted it as /mnt/DD. Up to this point all is well. I
can read and write to and from /mnt/DD from programs
running on the client so long as the client can see
the LTSP server.
If I disconnect the LAN cable, the program that writes
to /mnt/DD stops and I get the following message:
nfs server 192.168.0.254 not responding. Still
trying
This occurs even though the ultimate target is a local
ramdisk. The local ramdisk of the client is mounted on
a subdirectory of the server. When the server is
disconnected there is no way to reach the local
ramdisk. (Does this mean that each read/write to the
local ramdisk is going through the network? Or is the
"pointer" the program uses a local one?).
What I think I need is another local "root". That is
to say, a place to mount local devices that does not
depend on the LTSP server so that the LTSP server
could be disconnected but the local programs continue
working.
I've looked at several explanations of the "mount"
command. In all cases it is used to mount a device
onto a directory that already exists. I see no
information on how to create a initial mount point
that is local to the client..
To see if the problem was program execution I created
a "counter" program. It runs even when the LAN cable
is disconnected. So it appears that the problem is
when the programs attempt to access the local ramdisk
via the root.
Thanks for any help!
Grey
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