HP ProLiant BL490c Configuring the HP ProLiant Server BIOS for Low-Latency App - Page 11

Frequently asked questions

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Frequently asked questions Q. Does disabling Memory Pre-Failure Notification disable memory error correction? A. Memory errors are still corrected, but notification that the error rate has exceeded a pre-set threshold is disabled. The latency impact of this feature is very small. HP recommends disabling Memory Pre-Failure Notification only if absolutely necessary. Q. What memory features are lost if Memory Pre-Failure Notification is disabled? A. If Memory Pre-Failure Notification is disabled, Online Spare and Mirroring memory modes become unavailable. The system is forced to run in Advanced ECC mode, regardless of the mode set in BIOS. Memory Pre-Failure Warranty Support also becomes unavailable because there is no notification of errors exceeding the programmed threshold. Q. How does disabling iLO 2 Processor State Monitoring in the HP ProLiant cClass enclosure affect power management? A. Disabling state monitoring does not affect power management. Q. How can I verify that a server has the low-latency option set? A. There are three methods to verify that the low-latency option is set: • Use RBSU: a. Boot the system and press F10, and then select Inspect Utility. b. Select System EV Data. c. Select CQHGV3. The value of CQHGV3 should be 0x10 (Bit[4] is set). • Use a special configuration file, available on request from Lee Fisher ([email protected]), that displays these hidden low-latency settings. • Write and run a test script to see if you are getting spikes. For more information, contact Lee Fisher ([email protected]). Q. Does Microsoft® Windows Server® 2008 support real-time operations? A. Microsoft® Windows Server® 2008 is not available with a real-time extension. Q. Do HP BIOS low-latency options work in Microsoft® Windows®? A. HP BIOS low-latency options work in a Microsoft® Windows Server® 2008 environment. Because Microsoft® Windows Server® 2008 is not available with a real-time extension, only latencies associated with the BIOS SMIs will be affected. To apply the low-latency options in a Microsoft® Windows® environment: Frequently asked questions 11

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Frequently asked questions 11
Frequently asked questions
Q. Does disabling Memory Pre-Failure Notification disable memory error
correction?
A. Memory errors are still corrected, but notification that the error rate has exceeded a pre-set threshold is
disabled. The latency impact of this feature is very small. HP recommends disabling Memory Pre-Failure
Notification only if absolutely necessary.
Q. What memory features are lost if Memory Pre-Failure Notification is disabled?
A. If Memory Pre-Failure Notification is disabled, Online Spare and Mirroring memory modes become
unavailable. The system is forced to run in Advanced ECC mode, regardless of the mode set in BIOS.
Memory Pre-Failure Warranty Support also becomes unavailable because there is no notification of errors
exceeding the programmed threshold.
Q. How does disabling iLO 2 Processor State Monitoring in the HP ProLiant c-
Class enclosure affect power management?
A. Disabling state monitoring does not affect power management.
Q. How can I verify that a server has the low-latency option set?
A. There are three methods to verify that the low-latency option is set:
•
Use RBSU:
a.
Boot the system and press
F10
, and then select
Inspect Utility
.
b.
Select
System EV Data
.
c.
Select
CQHGV3
. The value of CQHGV3 should be 0x10 (Bit[4] is set).
•
Use a special configuration file, available on request from Lee Fisher (
), that
displays these hidden low-latency settings.
•
Write and run a test script to see if you are getting spikes. For more information, contact Lee Fisher
(
).
Q. Does Microsoft® Windows Server® 2008 support real-time operations?
A. Microsoft® Windows Server® 2008 is not available with a real-time extension.
Q. Do HP BIOS low-latency options work in Microsoft® Windows®?
A. HP BIOS low-latency options work in a Microsoft® Windows Server® 2008 environment. Because
Microsoft® Windows Server® 2008 is not available with a real-time extension, only latencies associated
with the BIOS SMIs will be affected.
To apply the low-latency options in a Microsoft® Windows® environment: