[Beowulf] Compute Node OS on Local Disk vs. Ram Disk

Bogdan Costescu Bogdan.Costescu at iwr.uni-heidelberg.de
Tue Sep 30 14:03:41 EDT 2008


On Tue, 30 Sep 2008, Brian Oborn wrote:

> It works well except that the fileserver gets hammered if there's a 
> time when many nodes are turned on at once.

I don't know what you call "many"... When I boot 100+ nodes 
simultaneously, the avgload on the rsync server stays under 1; the 
server is a "normal" machine, with 2 SATA disks under RAID-1, so 
nothing spectacular. The key is to make sure that the size of the 
"image" served to the nodes fits in RAM, then it's only read from disk 
once and served from cache. If you have several "images" (I need to, 
because the nodes are not identical, f.e. 32bit vs. 64bit), then the 
same applies to the total size of "images". RAM is cheap these days 
and any "normal" machine of today is able to take 4GB or more which 
should be enough for any cluster node installation - so no big hurdles 
in trying it.

-- 
Bogdan Costescu

IWR, University of Heidelberg, INF 368, D-69120 Heidelberg, Germany
Phone: +49 6221 54 8869/8240, Fax: +49 6221 54 8868/8850
E-mail: bogdan.costescu at iwr.uni-heidelberg.de
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