Were it me I'd be thinking idle workload(s) having its/their storage stolen.
That implies some (heavy) overnight other I/O workload - backups, updatedb, ...
Swappiness was invented for just this scenario - what is yours set at ?.

Top and the  ilk won't be of much help - a large (swap) I/O spike in your 
monitor data might be 
instructive. Sysstat should be able to show it from the Linux perspective.
It's possible it's mem-mapped file I/O, but you'd have to think that unlikely 
as a burst at wake-up.

Shane ...


On Thu, May 27th, 2010 at 3:13 AM, "Dean, David (I/S)" wrote:

> We are getting ready to put in to Production 10 new WebSphere /
> zLinux servers, each having 2 to 6 WebSphere Profiles, each server
> has 6 to 8 gigs allocated and they are attached to 3 IFL's on a z10.
> .  Every morning when you first login to the WebSphere management
> console it is slow.  After the initial logon response is fine. 
> What's going on?  Is something asleep? Cached out?

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