The consistent spike day to day makes me think something is scheduled.. like a nightly SIS update.
I agree that the hot disk issue is separate.  If you redistributed the data, the spike probably won't go away, it'll affect more disks and maybe have a shorter time span.

Brian


On Mon, Jan 28, 2013 at 2:39 PM, Jack Lyons <jack1729@gmail.com> wrote:
So it looks like it is all read i/o
Could you be running into a heavily deduped blocks in a 'sparse' database.

Jack
Sent from my Verizon Wireless BlackBerry

-----Original Message-----
From: Jeff Mohler <speedtoys.racing@gmail.com>
Sender: toasters-bounces@teaparty.net
Date: Mon, 28 Jan 2013 09:28:27
To: Fletcher Cocquyt<fcocquyt@stanford.edu>
Cc: toasters@teaparty.net Lists<toasters@teaparty.net>
Subject: Re: Aggregate Disk Busy 100% with volume IOPS low

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