Are your VMFS volumes block aligned? For optimal disk performance they should be. You can find out in the ESX Service Console with the following command:
fdisk -lu /vmfs/devices/disks/[vmhba_path]
A start value of 63 indicates no VMFS alignment (not the best)
A start value of 128 indicates VMFS alignment (great!)
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fdisk -lu /vmfs/devices/disks/[vmhba_path]
A start value of 63 indicates no VMFS alignment (not the best)
A start value of 128 indicates VMFS alignment (great!)
More vQuotes
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