[Pvfs2-users] I'm in the dark, need someone to shed some light

[belcampo]

Rob Ross wrote:
 > Hi Henk,
 >
 > Can you provide more information on the system that you're using 
 >(Linux version, # of nodes, type of nodes, type of storage, rate of 
I/O >to local storage, network type, units on the below measurements)?
2.6.18.3-largeio-pnfs, not using pnfs, 4 nodes, 3 IO/Meta and 1 client, 
1G ethernet.
 >
 > Thanks,
 >
 > Rob
 >
 > On May 13, 2008, at 12:26 PM, belcampo wrote:
 >> Hi all,
 >>
 >> Have 2.7.1 installed and see things I don't understand, maybe 
someone could shed some light ?
 >>
 >> Copying dvd.iso with cp -r from pvfs2 to local takes 1:34.79
I'm absolutely happy with this, 64MB/sec; hdparm gives 73MB max
 >> Local extracting of audio and video takes 2:47.63
I'm absolutely happy with this
 >> From pvfs2 the same action takes approx 2:40:00
These are minutes
 >> After 8 minutes 5% is done.
It was actually 2:06:07
This is hours
I don't understand why this takes
2:06:07 vs 2:47.63 = 7567 / 126 = 60 times as long
 >>
 >> Henk Schoneveld
 >>
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 >> Pvfs2-users at beowulf-underground.org
 >> http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users
 >