When we started mirroring for DR around 2000, we opted for XCF (now 
something-something-for-z/OS) over PPRC because of possible I/O impact. XRC was 
asynchronous, so mirroring might get behind but not impact production. 

J.O.Skip Robinson
Southern California Edison Company
Electric Dragon Team Paddler 
SHARE MVS Program Co-Manager
323-715-0595 Mobile
626-543-6132 Office ⇐=== NEW

-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf 
Of Tommy Tsui
Sent: Wednesday, February 14, 2018 1:15 PM
Subject: (External):DASD problem

> Hi all,

Our shop found the most job elapse time prolong due to pprc synchronization 
versus without pprc mode. It's almost 4 times faster if without pprc 
synchronization. Is there any parameters we need to tune on z/os or disk 
subsystem side? We found the % disk util in RMF report over 80, Any help will 
be appreciated. Many thanks

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