Disk Alignment
Disk Alignment This is one of the most crucial pieces that we can talk about so far regarding performance. Having the disks that make up the LUN misaligned can be a performance impact of up to 30% on an application. The reason this occurs is because of the “Signature” or MetaData information that a host writes to the beginning of a LUN/Disk. To understand this we must first look at how the Clariio
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Aligning ASM Disks on Linux
http://www.blueshiftblog.com/?p=300
