linux-kernel - Re: Velociraptor drive related to the use of NCQ.

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Date:	Fri, 5 Dec 2008 08:59:54 -0500 (EST)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org,
	xfs@....sgi.com, smartmontools-support@...ts.sourceforge.net
cc:	Alan Piszcz <ap@...arrain.com>
Subject: Re: Velociraptor drive related to the use of NCQ.



On Fri, 5 Dec 2008, Justin Piszcz wrote:

> I swapped out my power supply, changed ALL cables and bought a $1000 raid
> controller with BBU, the drives are still having problems, when writing to
> them in a RAID10 configuration, it locks up the card:
>
> SMART shows the same thing on many of the disks in the RAID10:
>
> Error 1 occurred at disk power-on lifetime: 3708 hours (154 days + 12 hours)
>  When the command that caused the error occurred, the device was active or 
> idle.

I spoke to soon, turning off NCQ helped dramatically, it worked three times!

writing to raid10
dd: writing `file2': No space left on device
1430328+0 records in
1430327+0 records out
1499806973952 bytes (1.5 TB) copied, 3914.51 s, 383 MB/s
Fri Dec  5 06:00:25 EST 2008
writing to raid10
dd: writing `file2': No space left on device
1430328+0 records in
1430327+0 records out
1499806973952 bytes (1.5 TB) copied, 4063.25 s, 369 MB/s
Fri Dec  5 07:08:11 EST 2008
writing to raid10
dd: writing `file2': No space left on device
1430328+0 records in
1430327+0 records out
1499806973952 bytes (1.5 TB) copied, 3926.71 s, 382 MB/s
Fri Dec  5 08:13:41 EST 2008

Then it crashed again, with NCQ enabled, it would not even complete one test,
So basically a new system, new PSU, new cables, its on a new APC UPS and the 
problem persists even when all disks are on a RAID card, SW raid, it does not 
matter, Velociraptors have problems, I think its time for me to get regular
1TiB disks and be done with it.

Justin.

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