HP IO Accelerator Driver and Management Software Version 3.2.3 Release Notes

Errata 19
Errata
Overview
This section describes issues you might encounter when using the IO Accelerator driver release.
General issues
Do not disable CPUs after loading the IO Accelerator VSL driver
If you plan to take any CPUs offline (including disabling Hyper-Threading Technology), you should do so
before the IO Accelerator VSL driver loads and begins to use the available CPUs. If you disable any CPUs
that were being used by the IO Accelerator VSL software, then the software might hang.
Improved hardware failure detection
Due to refined capabilities in detecting issues, some devices that are upgraded to work with IO Accelerator
VSL software version 3.2.3 might exhibit failures that were not detected previously. You might see the
following error message in the system log:
<device-name> some pads are write protected
This failure prevents potential data loss that might occur with continued use of the device. If your IO
Accelerator device fails with this error message, contact HP Customer Support. For United States and
worldwide contact information, see the Contact HP website (http://www.hp.com/go/assistance).
Keep default MSI interrupts for better performance
With IO Accelerator version 3.x and later, all IO Accelerator devices changed from using legacy-style
interrupts to MSI. This improves performance while decreasing CPU load.
If you want to continue using legacy interrupts, set the disable_msi VSL module parameter value to 1. For
examples on setting module parameters, see the "Module parameters" section in the HP IO Accelerator User
Guide for your operating system (Windows uses the fio-config utility and the parameter is in all caps:
DISABLE_MSI).
In limited situations, using legacy interrupts with the 3.x.x series driver might degrade performance as much
as 10% compared to previous releases. With the 3.x.x series driver, HP strongly recommends that you use
MSI (default setting) for optimal performance.
Improved thermal throttling
With improvements to thermal throttling on some devices, the IO Accelerator VSL software now throttles or
shuts down the device based on the device's NAND board temperature. The NAND board temperatures are
currently not exposed in the management interfaces, but a throttling or shutdown event is visible in the