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From Geoffry Roberts <geoffry.robe...@gmail.com>
Subject Seeking Advice on Upgrading a Cluster
Date Thu, 21 Apr 2011 17:33:08 GMT

 I am a developer, not a super networking guy or hardware guy, and new to

I'm working a research project. Funds are limited.  I have a compute problem
where I need to get the performance up on the processing of large text files
and no doubt Hadoop can help if I do things well.

I am cobbling my cluster together, to the greatest extent possible, out of
spare parts.  I can spend some money, but must do so with deliberation and

I have at my disposal twelve, one time desk top computers:

   - Pentium 4 3.80GHz
   - 2-4G of memory
   - 1 Gigabit NIC
   - 1 Disk, Serial ATA/150 7,200 RPM

I have installed:

   - Ubuntu 10.10 /64 server
   - JDK /64
   - Hadoop 0.21.0

Processing is still slow.  I am tuning Hadoop, but I'm guessing I should
also upgrade my hardware.

What will give me the most bang for my buck?

   - Should I bring all machines up to 8G of memory? or is 4G good enough?
   (8 is the max.)
   - Should I double up the NICs and use LACP?
   - Should I double up the disks and attempt to flow my I/O from one disk
   to the another on the theory that this will minimizing contention?
   - Should I get another switch?  (I have a 10/100, 24 port Dlink and it's
   about 5 years old.)

Thanks in advance
Geoffry Roberts

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