I have had this problem, both with read and write errors but I have only 
recently noticed it after doing a new install on a headless server and leaving 
the screen plugged in.  I have not had any crashed, data loss or data 
corruption.
Interestingly I have 3 HP ML150 servers but only 2 report this error the spec 
of each server is as follows:
server 1
Operon quad core 2.2
8GB RAM
2 additional PCI-e ethernet cards
4 x 250GB SATA HDD in software RAID10
Ubuntu server 12.04 64bit 

server 2
Operon quad core 2.2
4GB RAM
1 additional pci-e ethernet card
4 x 1.5TB SATA HDD in software RAID10
Ubuntu server 10.04 64bit 

server 3
Operon quad core 2.2
2GB RAM
0 additional pci/pci-e cards
4 x 1.5TB SATA HDD in software RAID10
Ubuntu server 10.04 64bit 

The Bios settings are all identical.  Servers 1 & 2 both have this
error, the 250GB drive are getting on a bit but the 1.5TB are brand new.
I have tried changing the cables with no effect.  The error has been
reported on all 4 drives for each machine.

Server 3 has not had any reports.  The only other difference is the PSU
has been replaced in server 3 for a cheap one from amazon!

This has lead me to think that is is a power related issue, but since it
does not seem to have any impact on performance or data integrity I am
not sure I need to be concerned??

 My next plan is to use the drive from either server 1 or 2 and put them
in server 3 to see if I get any errors.

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https://bugs.launchpad.net/bugs/550559

Title:
  hdd problems, failed command: READ FPDMA QUEUED

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