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Re: [Discuss-gnuradio] Hard Disk Bottleneck

From: Ryan Seal
Subject: Re: [Discuss-gnuradio] Hard Disk Bottleneck
Date: Fri, 09 Feb 2007 11:09:06 -0400
User-agent: Thunderbird (X11/20061206)

Vincenzo Pellegrini wrote:
Hi everybody,

just a quick question: has anybody managed so far to provide the usrp
with the 8 Complex Msps needed to transmit an 8 MHz wide band?

My problem is that such a bandwidth yields a 32MiBps throughput and,
even if the USB2 bus and the CPU speed of my machine are all right with
this, it looks like my IDE HARD DISK cannot provide such a data rate.

Can anyone please confirm whether he's been successful in something
similar, and, if so, with what kind of HD?



Discuss-gnuradio mailing list

You can successfully store data at those rates using SATA-II drives. You can also set up a RAID-O configuration with IDE drives and should get enough bandwidth. Actually we are using a more intensive system here with 8 SATA-II drives using an areca PCI-E card with a RAID-5 configuration and achieve continuous rates close to 200MBPS - so I know it can be done.

If you format your IDE drive and use a benchmarking program, you will typically see that, as the disk fills, data write speeds decrease linearly due to your position on the disk. You can sometimes look at the numbers and then create a smaller partition that can maintain these speeds.

Also, using isolated drives for data is important and we find the XFS filesystem to outperform all other filesystems for continuous writing.


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