On 07/12/2011 10:21 AM, Sandra Escandor wrote:
The Situation: It appears that a WRITE FPDMA QUEUED failed command causes driver timeouts - this in turn locks up the RAID (which once worked pretty well). This occurred during high I/O. The question: 1. Is it a good idea to turn off NCQ? I've read in different posts that it helps some, but not others - I'm currently on the way to getting an experimental box setup, but I wanted to confirm if this was a good idea.
Not really a solution to anything, at least not likely in this case. More of a workaround that might happen to work by chance.
2. Are there known issues with the ICH10R + WD7500BPKT-00PK4T0 and the libata driver?
Nothing known, no.
The System: Four WDC WD7500BPKT-00PK4T0 drives (Western Digital Scorpio) - in RAID10 array created using mdadm 3.1.4 ICH10R sata controller. Kernel 2.6.32-5-amd64
The fact that you have multiple drives and the problem tends to occur during heavy I/O may point to a power issue. This has been known to happen when some of the drives aren't getting enough power when there are spikes in power draw during I/O access. In this case, using a beefier power supply or spreading the drives out across different cables from the PSU may help.
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