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September 2010

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Subject:
Re: I/O delays
From:
Konstantin Olchanski <[log in to unmask]>
Reply To:
Konstantin Olchanski <[log in to unmask]>
Date:
Wed, 8 Sep 2010 15:46:09 -0700
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On Wed, Sep 08, 2010 at 04:42:43PM -0400, Devin Bougie wrote:
> Hi, All.  We are seeing periodic I/O delays on a new large compute node ...


Hi, you do not say what your disks are (model number as reported by smartctl),
but I have seen same symptoms as you describe with some WDC 2TB "advanced format" disks.
The problem vanished with the next shipment of these 2TB disks, which also happen
to have a slightly different model number.

So I say, if you see disk delays, try different disks (different maker, different
model, different capacity).


-- 
Konstantin Olchanski
Data Acquisition Systems: The Bytes Must Flow!
Email: olchansk-at-triumf-dot-ca
Snail mail: 4004 Wesbrook Mall, TRIUMF, Vancouver, B.C., V6T 2A3, Canada

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