[Beowulf] Consumer vs. Enterprise Hard Drives in Clusters
bill at cse.ucdavis.edu
Thu Jan 29 10:05:36 PST 2009
Erwan Velu wrote:
> Bill Broadley wrote:
>> I found my actual results from a WD consumer 320GB drive (single platter) with
>> the drive on the bench vs inside a 1U node:
>> Once the WD320 (a consumer drive) was replaced with a seagate es2 (raid
>> edition drive):
> Hey Bill,
> Are we sure the only difference between both cases are only the vibrations ?
Nothing else changed.
> Do you use the same disk controller in all cases ?
Same physical node, not just the same kind of node.
> Does the workload is exactly the same ?
Yes, an idle node with a PXE installed image runs my benchmark. My benchmark
is a very simple loop, basically read 4MB, print how long it took, repeat.
I'm using the raw device (/dev/sda), so the file system isn't installed. This
was repeated over several nodes I had a cluster that was being built. We
swapped out the disks and saw the dramatic difference.
I wish I had compared WD raid edition vs WD consumer, but I didn't have the
> Does the interconnect is the same ?
Yes, but I don't see how that could effect disk performance, nothing was going
over the network.
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