Typical RAID5 transfer speeds

[Matt Tehonica <matt.tehonica@xxxxxxx>]

I have a 4 disk RAID5 using a 2048K chunk size and using XFS  
filesystem.  Typical file size is about 2GB-5GB. I usually get around  
50MB/sec transfer speed when writting files to the array. Is this  
typcial or is it below normal?  A friend has a 20 disk RAID6 using the  
same filesystem and chunk size and gets around 150MB/sec. Any input on  
this??

Thanks,
Matt
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