[K12OSN] LTSP CentOS5 slow

jones yeates jones_yeates at hotmail.com
Wed Dec 3 19:51:03 UTC 2008

In the morning the students were on Window boxes using Flash and
Samba.  I think some of them were working directly off of the server: 
saving/executing.  I think that might have slowed things down.  I asked
them to copy the file onto their desktops and work from there and then
save it to their folders.  It seemed to work a bit better.

>Ah, now that will affect things in a big way.  If you've already got a
lot of disk I/O going, that will certainly slow things 
>down.  In your
situation, I'd have a physically separate, dedicated file server with
hardware SATA RAID (level 5 or 10) 
>and at least six spindles (hard disk
drives); the more spindles here, the better.  Any time I do any heavy
disk I/O on my 
>K12LTSP server here at home, it slows down the server. 
Of course, my server has only a SATA RAID 1.

This has been the 2nd class with Flash and the server has been fine.  It looks like that might have been the culprit.


During the afternoon (they were on a Linux box), there was no noticable
lag.  I also asked the students to try to use Opera instead of
Firefox.  They complained a bit but it was nice to see the CPU numbers
go down.


> Have them try Konqueror as well.  It takes wonderful advantage of
shared libraries (thus lower DRAM usage) and also 
> will find/use the
Firefox plugins (Flash, etc.).  Further, it comes with stock K12LTSP
and thus works with "yum 
> update".

I tried Konqueror and I noticed that the cisco.netacad.net site works on it now.  I upgraded Firefox and Flash stopped working on it.  Cisco Academy said I had to downgrade to get the site to work.  The site didn't work in Opera.  It only works in Konqueror.  Thanks for the tip!  I no longer have to go to Windows to view that site. =]


-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://listman.redhat.com/archives/k12osn/attachments/20081203/a4aebeb2/attachment.htm>

More information about the K12OSN mailing list