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Different Alignment Offset
Hi All,
with the recent release of the flare 30 I noticed the recommended align paramater in disk part has changed from 64 to 1024 for windows 2003 sp and greater. Just curious why the shift for an o\s that has been around for a bit. I'm assuming there has been a change at the array end.
Cheers
jl
dynamox
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November 29th, 2010 15:00
it's actually Microsoft recommendation, alignment does not need to be done on windows 2008 though. See this solution: emc104675, emc190529
SKT2
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December 19th, 2010 08:00
The recommendation(1024 offset) is applicable to lower flare versions too, not just 30.
Storagesavvy
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December 19th, 2010 12:00
The key is to align to a multiple of the array's element size. Since Clariion's element size is normally 128 blocks (64KB), you want to align to 64KB or a multiple of 64KB. 1MB (1024KB) is a multiple of 64KB so it's valid. Windows 2008 uses 1MB as the default alignment offset which is why you don't have to manually align Windows 2008 partitions.
If you followed early NetApp recommendations, you would have used 32KB for NetApp arrays, but that would not be good for Clariion arrays, hence the new 1MB recommendation. Different storage vendors and products have different element sizes, the recommendation of 1MB is good because it works for pretty much any storage system from any vendor.