> -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of Paul Gilmartin > Sent: Monday, January 28, 2008 9:10 AM > To: [email protected] > Subject: Re: Keep only the tail of the dataset
[snip] > Might yet be done allocating the trace file in JCL to a named > pipe (FIFO) to be read by a chopping daemon. The FIFO could > be allocated and the daemon started in a prior job step. Two > likely problems: > > o If the trace records are variable length containing binary > information, that can not be preserved in a Unix file. Why not? I have successfully ftp'ed raw (binary) SMF data, including the RDWs from z/OS to Linux. I can then read the file using Java, decoding the RDWs. UNIX itself does not care what data is being written to a file. It is just a byte stream. Of course, if the creating program itself does not have some way to delimit an end-of-record, then it __might__ not be possible to reliably read the data. E.g. undefined records which don't have an RDW, nor an end-of-record indicator (like program objects). > > o If the daemon crashes, it soon takes the application down > with it. Hum, I haven't tried, but I was under the impression that if the "reader" went down, the "writer" would soon stop due to the buffer being full. The "writer" would then wait until a "reader" started up again. Oh, wait, yeah, a S522 on the "writer" might occur if it took too long to restart the "reader". > > -- gil -- John McKown Senior Systems Programmer HealthMarkets Keeping the Promise of Affordable Coverage Administrative Services Group Information Technology The information contained in this e-mail message may be privileged and/or confidential. It is for intended addressee(s) only. If you are not the intended recipient, you are hereby notified that any disclosure, reproduction, distribution or other use of this communication is strictly prohibited and could, in certain circumstances, be a criminal offense. If you have received this e-mail in error, please notify the sender by reply and delete this message without copying or disclosing it. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
