A fix is available
APAR status
Closed as program error.
Error description
SUC processing can possibly cause a DASD device to stall. If, during SUC recovery other errors are encountered, such as reset notification a device may have a Suspend Multipath Reconnect command added to the CCW string. This could cause the I/O to be queued instead of driven on the device. This would cause the device to stall since the SUC recovery processing isn't allowed to continue.
Local fix
Problem summary
**************************************************************** * USERS AFFECTED: All z/VM users * **************************************************************** * PROBLEM DESCRIPTION: * **************************************************************** * RECOMMENDATION: APPLY PTF * **************************************************************** Summary unit check recovery processing can possibly stall due to a Suspend Multipath Reconnect (SMR) CCW being issued prior to the Reset Summary Unit Check CCW. An SMR CCW does not work through a summary unit check condition and will get queued instead of executed stalling recovery of the Summary Unit Check condition indefinitely.
Problem conclusion
Summary Unit Check (SUC) recovery does not require an SMR CCW. Therefore, it will be removed so that this possible stall will be eliminated.
Temporary fix
********* * HIPER * ********* FOR RELEASE VM/ESA CP/ESA R640 : PREREQ: NONE CO-REQ: NONE IF-REQ: NONE FOR RELEASE VM/ESACP/ESAR710 : PREREQ: NONE CO-REQ: NONE IF-REQ: NONE
Comments
APAR Information
APAR number
VM66350
Reported component name
VM CP
Reported component ID
568411202
Reported release
640
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2019-12-06
Closed date
2020-02-04
Last modified date
2021-06-29
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UM35592 UM35593
Modules/Macros
HCPDTE
Fix information
Fixed component name
VM CP
Fixed component ID
568411202
Applicable component levels
Fix is available
Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.
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Document Information
Modified date:
30 June 2021