Date: Wed, 12 May 2010 20:21:27 -0300 (ADT) From: "A. Wright" <andrew@qemg.org> To: Adam Vande More <amvandemore@gmail.com> Cc: FreeBSD - <freebsd-questions@freebsd.org>, Mike Tancsa <mike@sentex.net> Subject: Re: Long I/O pauses on same mass storage Message-ID: <alpine.BSF.2.00.1005122013470.64303@qemg.org> In-Reply-To: <AANLkTil5ozngCzmfiGMgXfhkDW99IW5NaHI4MU2sRz2V@mail.gmail.com> References: <alpine.BSF.2.00.1005121035480.64303@qemg.org> <201005121456.o4CEurEZ078671@lava.sentex.ca> <alpine.BSF.2.00.1005121632520.64303@qemg.org> <BDDFA682-70FC-4240-AF3C-6AE03168FFE7@mac.com> <alpine.BSF.2.00.1005121726090.64303@qemg.org> <201005122049.o4CKn7kS080566@lava.sentex.ca> <AANLkTil5ozngCzmfiGMgXfhkDW99IW5NaHI4MU2sRz2V@mail.gmail.com>
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On Wed, 12 May 2010, Adam Vande More wrote: > On Wed, May 12, 2010 at 3:49 PM, Mike Tancsa <mike@sentex.net<mailto:mike@sentex.net>> wrote: > At 04:27 PM 5/12/2010, A. Wright wrote: > === START OF INFORMATION SECTION === > Device Model: WDC WD15EARS-00S8B1 > Serial Number: WD-WCAVY2700359 > > Isnt that one of those Western Digital Green drives ? I seem > to recall a number of people complaining about similar issues > where the drive stalls. Perhaps a firmware update ? Or perhaps a > way to disable the power saving/spin down features ? Is your > controller set to AHCI, or regular SATA. what does > /var/run/dmesg.boot show ? This is indeed one of the so-called "eco" drives. The controller is set to SATA (no mention of ahci, though I will now look at it as suggested earlier to see if I can control the problem that way). > In addition to what I pointed out earlier, I believe that is > also a 4k sector drive. You'll need to align your partitions > accordingly. As far as I can tell, it is a standard 512 byte sector. The general lack of documentation with this drive (shipped in a plastic "coffin" -- the only docs supplied with it were the label itself), but on the WD site, they indicate: Formatted Capacity 1500301 MB Used Sectors Per Drive 2930277168 Assuming a "megabyte" is 10^6 bytes, as is standard with storage vendors (1500301 * 1000 * 1000) / 2930277168 = 511.99968 So it appears that at least I don't have *that* particular problem. Thanks for the suggestions; I had not looked at AHCI before, and it may well be part of my ticket out of this problem. A.
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