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Old 01-03-2011, 04:13 PM   #1
Eppo
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transfer speeds


my linux server is running with an old IDE hard drive getting these hdparm results:
eppo@server:~$ sudo hdparm -t /dev/sdf1

/dev/sdf1:
Timing buffered disk reads: 30 MB in 3.13 seconds = 9.60 MB/sec

i also have a raid set up which gets these results:
eppo@server:~$ sudo hdparm -t /dev/md0

/dev/md0:
Timing buffered disk reads: 490 MB in 3.01 seconds = 163.00 MB/sec

i have a WD Raptor drive i'm going to install and put a fresh install of linux on it.
i'm just curious, will using a much faster HD as my main drive increase the speeds of my network transfers from the raid drive?
do transfers only go as fast as the system drive?
thanks
 
Old 01-03-2011, 04:24 PM   #2
mostlyharmless
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I would think that as long as the system drive is not involved in the data transfer, which it shouldn't be in a network access to the array, it won't limit the speed.
 
Old 01-03-2011, 04:37 PM   #3
lazlow
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Keep in mind that ethernet only transfers 12MB/s(roughly 9.5MB/s with overhead) swiching to GigE will bump you up to 95MB/s(real throughput). GigE HAS to be GigE from end to end in order to work(nic->cable->switch->cable->nic all HAVE to be GigE in order for it to work).
 
Old 01-03-2011, 04:44 PM   #4
jefro
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I have found that transfers are more limited by cpu on older systems. If you have an enterprise level nic you could offload checksum to speed it up. Also you have a backplane issue that can't be fixed either.
 
  


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