It can be pretty signifigant, it's not as well documented as VMDK
misalignment but I'd expect similar numbers.
It looks like the Solaris configuration shouldn't be an issue, it's got
a larger offset but still aligned the same way as an AIX LUN.
________________________________
From: MRWILLIS(a)UP.COM [mailto:MRWILLIS@UP.COM]
Sent: Wednesday, February 03, 2010 10:49 PM
To: Roach, Steven; Page, Jeremy; toasters
Subject: Re: Changing a LUN type
Anyone ever get an IO performance delta on the misalignment created
between the file system and the LUN? I suppose it would depend on the
amount of IO, but just curious. Thanks.
________________________________
From: "Roach, Steven" [Steven.Roach(a)netapp.com]
Sent: 02/03/2010 10:07 PM EST
To: "Page, Jeremy" <jeremy.page(a)gilbarco.com>;
<toasters(a)mathworks.com>
Subject: Re: Changing a LUN type
Jeremy,
The LUN type setup up characteristics for that LUN like On-Disk Layout,
while this may be working for you, you might not have optimal
performance.
Once it is created, I don't think you can change the LUN type, you would
have to create a new one (same size) with the correct LUN type and copy
over the data.
On 2/3/10 9:22 PM, "Page, Jeremy" <jeremy.page(a)gilbarco.com> wrote:
I am probably missing something simple but I have an AIX system
running off a LUN that's configured for a Solaris box. I have two
questions -
*What's the impact? Are they essentially the same or is there a
difference between the two that's going to cause me grief
*How do I change it?
Any suggestions would be much appreciated.
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