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New RAID Array: Writing Faster Than Reading?

post #1 of 2
Thread Starter 
Today I took delivery of three Samsung 2TB F4EGs. After performing the necessary firmware update, I decided to bench them using the "Disk Utility" which ships with Ubuntu 10.04 LTS.

Benching them individually saw max read speeds of between 140MB/s and 155MB/sec. Then I decided to create a RAID 0, and bench that. I saw a max read speed of 400MB/sec (which is about right) and a write speed of 600MB/s!

How can this be? Does Ubuntu 10.04 enable some kind of writeback cache when it creates a RAID array?
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post #2 of 2
Thread Starter 
Quick update. Looks like it was some kind of anomaly. It happened again when I created a RAID 5 array, but at the exact same point during the test - 85%. Didn't happen on subsequent runs though.
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Samsung 850 EVO AMD Wraith Spire Linux Mint 18.x Dell UltraSharp U2414H 
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Overclock.net › Forums › Software, Programming and Coding › Operating Systems › Linux, Unix › New RAID Array: Writing Faster Than Reading?