Thanks for the insight Robert. Do you (or anyone else on the list) know if there are any utilities that exist that would be able to allow me to observe (and log) the power consumption of the drives during high I/O? -----Original Message----- From: Robert Hancock [mailto:hancockrwd@xxxxxxxxx] Sent: Friday, July 15, 2011 9:17 PM To: Sandra Escandor Cc: linux-ide@xxxxxxxxxxxxxxx Subject: Re: Western Digital Scorpio and ICH10R on Debian - NCQ issue? 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. -- To unsubscribe from this list: send the line "unsubscribe linux-ide" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
