A fix is available
APAR status
Closed as new function.
Error description
Path control for EDEVICES enhancements include improved health checking, path selection, error reporting and statistics. Health checking of failing paths occur with more frequency to bring paths in recovery back online more regularly. The category of error and failure types is now recorded and made available using a new QUERY EDEVICE operand and updated monitor records. Asymmetric Logical Unit Access (ALUA) support within the path control module improves path selection for supported devices.
Local fix
N/A
Problem summary
**************************************************************** * USERS AFFECTED: All SCSI EDEV users * **************************************************************** * PROBLEM DESCRIPTION: * **************************************************************** * RECOMMENDATION: APPLY PTF * **************************************************************** The reliability of EDEVICE path control needs improvement.
Problem conclusion
Temporary fix
FOR RELEASE VM/ESA CP/ESA R720 : PREREQ: VM66439 VM66477 VM66173 VM66420 VM66504 VM66449 PREREQ: VM66485 PREREQ: VM66469 VM66510 VM66471 VM66212 VM66271 VM66414 PREREQ: VM66545 CO-REQ: NONE IF-REQ: NONE
Comments
EDEV Path Management is an update to the path control module of the z/VM SCSI driver for emulated devices that heavily refactors the component and upgrades key functions in several areas: o Path selection o Path state tracking o Path health checking Additional states have been added to the state tracking system for paths and devices, making it more robust, and the module will now be able to perform smarter path selection for disks that support dynamic ALUA by taking advantage of their optimized/non-optimized port group assignments. Many structures are enhanced or modified to store new status information, and those useful for diagnostics are exposed with modifications to the Query EDEV command and monitor records. To support APAR VM66507, a new edition of the following publication is available: SC24-6268-09: CP Commands and Utilities Reference
APAR Information
APAR number
VM66507
Reported component name
VM CP
Reported component ID
568411202
Reported release
720
Status
CLOSED UR1
PE
NoPE
HIPER
NoHIPER
Special Attention
YesSpecatt / New Function / Xsystem
Submitted date
2021-03-16
Closed date
2021-08-30
Last modified date
2023-01-10
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UM35902
Modules/Macros
CBITABLE CPLOAD CPSYNTAX EDEVICE EDEVSB HCPCBI HCPCKS HCPCRR HCPDGB HCPDMP HCPDVT HCPEDEV HCPEQI HCPHCQ HCPHSE HCPMDLAT HCPMES HCPMESB HCPMNO HCPMOM HCPMXI HCPMXRBK HCPPPI HCPSCFBK HCPSDU HCPSDV HCPSNQ HCPSZA HCPSZB HCPSZC HCPSZD HCPSZE HCPSZG HCPSZJ HCPSZK HCPSZL HCPSZM HCPSZN HCPSZO HCPSZP HCPSZQ HCPSZQBK HCPSZR HCPSZT HCPSZV HCPSZW HCPSZX HCPSZY HCPSZZ HCPXLCEL HCPXLCPL HCPZSR HCWAIX HCWAI1 HCWAI2 HCWAI3 HCWAI4 HCWAI5 HCWAI6 HCWAI7 HCWAI8 HCWAI9 HCWA10 HCWA11 HCWA12 HCWA13 HCWA14 HCWA15 HCWA16 HCWA17 HCWA18 HCWA19 HCWA20 HCWA21 HCWA22 HCWA25 HCWA27 HCWCSP HCWCS1 HCWCS2 HCWCS3 HCWEFS HCWEF1 HCWIOS HCWIO1 HCWIO2 HCWIO3 HCWMPI HCWPAI HCWPA1 HCWPA2 HCWPA3 HCWPA4 HCWPA5 HCWPA6 HCWPA7 HCWPA8 HCWPER HCWPSI HCWPS1 HCWPS2 HCWPS3 HCWSCS HCWSC1 MRIODDEV MRIODSZI MRIODVON MRMTRDEV
SC24626808 |
Fix information
Fixed component name
VM CP
Fixed component ID
568411202
Applicable component levels
R720 PSY UM35902
UP21/08/31 P 2201
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:
10 January 2023