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Large I/Os Are Split into 64KB Units When Using LSILogic Driver

Details

In Windows XP virtual machines using the LSILogic driver, I/Os of a size larger than 64KB might be split into multiple I/Os of a maximum size of 64KB. This might adversely affect I/O performance.

Solution

You might be able to improve I/O performance by editing the registry setting HKLM\SYSTEM\CurrentControlSet\Services\Symmpi\Parameters\Device\MaximumSGList.

Refer to the section "Large Block Size Support " in the following document:

http://www.lsi.com/DistributionSystem/AssetDocument/documentation/insight_center/tech_trends/fusionmpt/FusionMPT_DevMgrUG.pdf

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KB Article: 9645697
Updated: Aug 14, 2009

Products:
VMware ESX
Product Versions:
VMware ESX 2.5.x
VMware ESX 3.0.x

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