Date: Wed, 12 May 2010 10:56:49 -0400 From: Mike Tancsa <mike@sentex.net> To: "A. Wright" <andrew@qemg.org>, freebsd-questions@freebsd.org Subject: Re: Long I/O pauses on same mass storage Message-ID: <201005121456.o4CEurEZ078671@lava.sentex.ca> In-Reply-To: <alpine.BSF.2.00.1005121035480.64303@qemg.org> References: <alpine.BSF.2.00.1005121035480.64303@qemg.org>
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At 09:46 AM 5/12/2010, A. Wright wrote:
>While I will run some further tests here, I thought I would
>ask:
>
> Is anyone else seeing poor disk I/O scheduling or locking
> behaviour in 8.0?
Hi,
On my backup server I am seeing somewhat better
throughput/performance, at least with ZFS, but I have not done any
rigorous comparisons. Certainly nothing perceptible from userland
> Is anyone aware of any of the filesytem changes that
> have occurred since 7.2 that may explain this?
There are a lot, but then again the act of installing / upgrading
could just mean you are now hitting bad sectors on the drive ?
> Does anyone have any thoughts on how to conclusively
> prove that the drive is at fault? I have not seen any
> errors logged to dmesg.
Start with smartmontools to ask your disk if it has logged any errors
and check once a day or so to see if sectors are being remapped.
---Mike
>Thanks,
>Andrew.
>
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