VSM5/VSM5C Microcode ETTFB Problem

Asset ID:	1-77-1496574.1
Update Date:	2013-08-20
Keywords:

Solution Type Sun Alert Sure

Solution 1496574.1 : VSM5/VSM5C Microcode ETTFB Problem

Applies to:

Sun StorageTek VSM System - Version 4 to 5C [Release 4.0 to 5.0]
IBM z/OS on System z

Description

While running D/H02.14 code and using the ETTFB (Early Time To First Byte) feature the VSM (VTSS) encounters a device hang that requires a cold boot (power cycle) of the VSM to recover.

UPDATE: While running D/H02.15 code and using the ETTFB feature the VSM (VTSS) can encounter FSC 3BC8 and/or FSC 3BC7 warm boots. If a damaged VTV is accessed repeatedly then these warm boots can become repetitive.

Occurrence

While using ETTFB feature

Symptoms

While running D/H02.14 code and using the ETTFB (Early Time To First Byte) feature the VSM (VTSS) encounters a device hang that requires a cold boot (power cycle) of the VSM to recover.

History

Symptoms

While running D/H02.14 code and using the ETTFB (Early Time To First Byte) feature the VSM (VTSS) encounters a device hang that requires a cold boot (power cycle) of the VSM to recover.

Changes

Cause

There is a microcode fault in earlier levels of microcode that can result in these problems.

Solution

Turn off ETTFB (Early Time To First Byte) until the VSM (VTSS) is running on D02.17 or H02.17 code.

Release of these code levels is currently scheduled for mid-September, 2013.

The default setting for the ETTFB parameter is no.

If ETTFB is enabled then the parameter to turn it off is: FASTRECL = NO

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