NFS gives me very buggy results when a share is using data that detaches
network reachability suddenly (ala vpn or other, dedicated remote hosts
bound to wilds of the intertubes). It'll break the desktop, usability,
apps halt. etc. Wouldn't surprise me if something tried to flock a file
and couldn't at the moment for whatever reason. I've run gtk apps from
nfs before and found it fairly unstable when mobile on wifi or other
that interrupts connectivity.
I've largely not moved my homedir over to strictly nfs because of that
instability, but I'd like to try as I mostly rsync my homedir elsewhere
as much as possible already.
-mb
On 06/28/2012 09:46 AM, Mark Phillips wrote:
The results so far....
running exim4, cups, apache2, openvpns, and ntp, resutled in
5349 packets transmitted, 5349 received, 0% packet loss, time 53480414ms
rtt min/avg/max/mdev = 0.101/0.207/3.027/0.050 ms
So the problem is in one of these applications
mediatomb
mysql
nfs-common
mfs-kernel-server
rpcbind
I will set up a test tonight for these bad boys.
Mark
On Wed, Jun 27, 2012 at 9:58 AM, Mark Phillips
<[email protected] <mailto:[email protected]>> wrote:
Rusty,
I am running another test now, with the following services running
exim4
cups
apache2
openvpnas
cups
ntp
I will keep you posted.
Mark
On Wed, Jun 27, 2012 at 9:16 AM, Carruth, Rusty
<[email protected]
<mailto:[email protected]>> wrote:
Well, I had to ask J____
__ __
I’d say its ‘divide and conquer time’ like I suggested earlier –
enable half (approx) of the services and run the test. If it
passes, turn those off and then turn on the other half, rerun
test. If it passes, life gets hard, and I’m going to ignore
that possibility for now! Whichever test fails, repeat the
above with that reduced set of services.____
__ __
If both halves pass, then there is some interaction between the
services, and it’s not so easy as divide and conquer. (but of
course, if a service depends upon another one to be fully
functional (apache and mysql are likely examples) then you’ll
have to keep those services together till the bitter end (as it
were)).____
__ __
However, there is still hope someone here has another idea…____
__ __
Rusty____
__ __
*From:*[email protected]
<mailto:[email protected]>
[mailto:[email protected]
<mailto:[email protected]>] *On
Behalf Of *Mark Phillips
*Sent:* Wednesday, June 27, 2012 9:12 AM
*To:* Main PLUG discussion list
*Subject:* Re: Strange Server Behavior____
__ __
Rusty,
The test was run from 11 PM to 7 AM, so no one in my house was
doing anything but sawing logs, as far as I know. Yes, teenagers
tend to stay up late, but I would have heard the tv. I don't
think any of the other machines are really doing anything at
that time as well.
I don't think anyone is using my wifi....I have a 64 character
key for AES and mac address filter for security. Yes, I know one
can eaily spoof the mac address thing, but it keeps some out. I
also have not seen anything strange in the logs.
Rsync is a good idea, but I agree - fragile, lots to set up, but
maybe worth a thought if nfs tends to be the problem. Maybe a
script to check if a local folder has changed, and then rsync
it........
Mark____
On Wed, Jun 27, 2012 at 8:59 AM, Carruth, Rusty
<[email protected]
<mailto:[email protected]>> wrote:____
Well, NFS server is less likely (I think!) to cause momentary
freezes than the client, but samba MIGHT be an idea. Hopefully
someone else here has more experience with the server side of
things, or maybe google would help.____
____
On the upload video thing – if you wanted to go to a lot of
work, you could put directories on each computer that
periodically get rsync’d (or whatever) to the server, so that
the family members only need to copy the movie to the directory
on their machine and it will automatically get copied across.
But that may be more work and fragility than you want J (and
might make you more expendable!). but that could get rid of nfs
or samba or any such thing. Probably not worth doing if NFS
isn’t’ the issue J, so I’d say turn on half the processes and
see what happens, as I mentioned before..____
____
Thinking about the system for a bit – first the schedule of when
things freeze. Does it line up with anything being done on the
client machines? On the TV? What ‘absolute time’ (wall clock
time) were those 38 incidents at? (If clients do something
every 30 minutes, and they are out of sync with each other, that
might explain the variability of the hiccup timing)____
____
Going a bit further afield: Have you verified that nobody is
using your wifi for any nefarious purposes? ____
____
Just some random thoughts…____
____
Rusty____
____
*From:*[email protected]
<mailto:[email protected]>
[mailto:[email protected]
<mailto:[email protected]>] *On
Behalf Of *Mark Phillips
*Sent:* Wednesday, June 27, 2012 8:47 AM____
*To:* Main PLUG discussion list
*Subject:* Re: Strange Server Behavior____
____
I only installed nfs because I started to use this server as a
media server, and I wanted my family to be able to add movies to
the movie folder on the server. Mediatomb then scans the folder
and makes the movies available on our nifty wifi enabled TV. ____
Would samba be a better choice? The other computers on the
network are mac, windows, ubuntu. However, the windoes user has
a low probability of adding any movies by herself....;) (no
gender bashing here.....I live with four wonderful women, and
one of them is a complete techo-phobe, and she is proud of
it.....but that helps keep me around, so all is good with the
world).
Mark ____
____
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