Comments on: Disk I/O a Virtualization focus area…

By: rbocchinfuso

rbocchinfuso — Sun, 12 Sep 2010 15:51:40 +0000

Bit of clarification on the partition offset alignment comments. The alignment offset that I was referring to was not associated with VMFS volumes but rather with RDM volumes where the physical disk will be mapped directly to the VM. Important to note that using diskmgmt.msc in Windows 2008 now aligns partitions so administrators no longer need to use diskpar to perform the alignment. Remember that in order to use advanced array based technologies RDM volumes are still required so users should be educated beyond what the VI client does for them.

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By: Alistair Sutherland

Alistair Sutherland — Wed, 24 Sep 2008 09:15:52 +0000

It should be noted that the information regarding offsets from
VMware is contradictory. Aways create a VMFS using the VI client,
or offset the partition by 128 blocks if using fdisk.

By: Alex Weeks

Alex Weeks — Fri, 10 Nov 2006 18:20:45 +0000

Just an FYI regarding partition offsets. The VMware guides say that you shouldn’t create VMFS partitions during installation. Instead, you should create them from Virtual Center. If you create then with Virtual Center it’s supposed to take care of the offset issue for you.