HP Tru64 UNIX Technical Updates for the Version 5.1B and Higher Operating System and Patches (February 2010)

This is most likely to be noticeable when running applications that are sensitive to increased

interrupt latencies. In these cases, envmond should be looked at closely as a possible source of

performance degradation until further notice (it is possible that future versions of envmond will

not use hwmgr). Additionally, users with root access should avoid manually querying the

hardware sensors using the hwmgr -get attr command.

The envmond daemon runs by default. See the envconfig(8) reference page for instructions on

changing this behavior.

Inappropriate Environmental Message Seen on AlphaServer GS1280 (May 2005)

Environmental monitoring on an AlphaServer GS1280 may act incorrectly if an environmental

event such as a power supply or fan failure or an over-temperature condition is detected when

the system is booting. When this occurs you will see the following message on your console:

mvcpu_log_error: Cannot find temperature sensor

This message indicates that the system tried to send an EVM event describing the environmental

error, but an internal error occurred.

In most configurations, you can ignore this message. The machine check data will have been

logged into the binary error log as usual. Proceed with determining the root cause of the

environmental event using the binary error log.

If you see this problem at times other than during booting, you can correct it by installing the

Version 5.1B-3 patch kit.

Limitation on CPU Offline Process (Feb. 2005)

Each CPU on the AlphaServer ES47/ES80/GS1280 series has the capacity to handle I/O interrupts

from either a locally attached I/O adapter or from another CPU that has been offlined. However,

each CPU is limited to handling the I/O interrupts of two CPUs total, including its own local I/O.

Therefore, on a system with X I/O hoses, the largest number of CPUs that can be offline at any

one time is (X/2). Attempts to offline more CPUs will result in the following error message from

psradm:

offline: processor N: Invalid argument

There is currently no command to tell you which CPUs are handling I/O interrupts from which

I/O adapters.

This information will be included in the psradm(8) reference page that will be installed with Tru64

UNIX Version 5.1B-3.

Shared SCSI Support on AlphaServer DS15 Systems (Feb. 2005)

Tru64 UNIX supports a shared SCSI bus using the DS15 embedded external SCSI port and the

following Tri-link cabling kit:

DescriptionPart Number

Shared SCSI Adapter Kit for AlphaServer DS15 (Tri-link)3X-H8411-BA

3 meter terminator cable3X-BN56A-03

4 meter terminator cable3X-BN56A-04

This adapter kit and cables replaces the y-cable based solution previously supported on

AlphaServer DS15 systems. The following sections describe the configuation requirements for

the shared SCSI bus.