A fix is available
APAR status
Closed as program error.
Error description
In some rare cases when Media Manager retries a failed channel program, it may not read or write all of the blocks that were requested. Media Manager may terminate the request early. This can occur for MIDAW or zHPF channel programs if redriven. In the case presented for this apar, under z/OS 1.10, the program was reading a SAM extended format data set. There were 63 CI's passed to MM to read. MM created 3 zHPF channel programs. If the read received an IFCC due to a hardware defect, MM will re-do the reads in Command Mode using non-zHPF channel programs and he skips some of the 63 CI's, with no indication back to the application. The number of CI's skipped is variable dependent on where the IFCC was presented in the 3 channel programs. Message IOS050I IFCC was seen in the syslog and joblog.
Local fix
Turn off zHPF and MIDAW functions via the SETIOS MVS command.
Problem summary
**************************************************************** * USERS AFFECTED: All dfsms users at HDZ1A10 * **************************************************************** * PROBLEM DESCRIPTION: after a media manager retryable IO * * error, a flag is left on which may * * cause the retry of the failed IO to * * terminate early. * * this may cause IO to be incorrectly * * reported as complete. Updates writes or * * reads may have been skipped. * **************************************************************** * RECOMMENDATION: * ****************************************************************
Problem conclusion
when calculating space for a channel program and a CI is added to the channel program, the bit zzpllst will be set off. This will clear this bit in case it was set on in a prior channel program build path. KEYWORDS: ZHPF/K DATALOSS
Temporary fix
********* * HIPER * *********
Comments
APAR Information
APAR number
OA45952
Reported component name
DFSMS MEDIA MAN
Reported component ID
5695DF126
Reported release
A10
Status
CLOSED PER
PE
NoPE
HIPER
YesHIPER
Special Attention
NoSpecatt / Xsystem
Submitted date
2014-08-28
Closed date
2014-09-09
Last modified date
2015-02-10
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
UA74783
Modules/Macros
ICYBLD64 ICYPIO64
Fix information
Fixed component name
DFSMS MEDIA MAN
Fixed component ID
5695DF126
Applicable component levels
RA10 PSN UA74783
UP14/09/10 P F409
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 February 2015