OSCAR community,
hi all !
a couple of posts in one..
first off its friday and in europe this weekend has 'May day' which is 3
days off for most of us. It appears to be the start of summer here in
Dublin..
So a happy weekend to all !
Secondly I wanted to to share my 'success' to the list.
I've now got 2 OSCAR based clusters running using a bunch of old lab
machines
one 20 node for 'work' and one 8 node for testing latest betas etc.
I'm going to try the debian test this week.
Currently can sign off the pre-release 5.0 working fine on Fedora
Core 4.
It didn't come easy so thank you to all who helped out.
The biggest issue problem out to be the 3Com 3C905CX-TXM cards in the
machines.
I saw the warnings about some 3Com card but thought as there were
common model family and etherboot supported them I would be fine and
forgot about it.
Then I had weird inconsistent problems in the install of the client
nodes.
The image transfers would just freeze in some machines and work fine
in others with the exact same hardware
After much teeth gnashing, re-installs and time.
I tracked it down to the network cards which I now hope to replace.
(any suggestions for good linux models ?)
The short term solution was upgrade rsync to the latest (not sure if
this was the solution) then to pop an old 10Mb hub between the
compute node switch and the headnode
The effect of slowing network traffic down in the client install was
enough to get them all up.
The test cluster scripts work but I have the feeling if I did
intensive data work I'd see the problem again. My problem domain is
cpu intensive & low on data.
Now that i am up and running
I'm about to do a talk to my colleagues on what they now have available
I was wondering if anyone has a presentation they could share on the
basics of OSCAR and what it means to a user ?
lastly
there was a question a week or so again about benchmarking
the answer was that it depends on the intended use. fair enough.
I was thinking that there still must be something more generic that
could help if one wanted to know what improvements (or not) if one say
moved from a hub to a switch, or added memory to the compute nodes,
or doubled the number of nodes
my example would be if i joined some of my 8 test nodes into the main
'production' setup.
what woud i gain 'in theory' for my application.
any ideas ?
again, thank you to the community for all your help.
/Neil
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