Thanks to all who responded. To John M - yes, I was thinking in "z/OS" terms, where a single open of the DDNAME is sufficient for all the datasets in that DDNAME.
To David, Ed and John S - the annoying thing about pipes here is that they incur extra I/O for the "cat" command, and since these files are very large (approx 20GB daily) this extra I/O will be very costly, probably excessively so here. Looks like I'm out of luck here, more thinking required. Thanks again, Peter Peter Bishop HP Enterprise Services Asia Pacific South Mainframe Capability & Engineering +61 2 9012 5147 office | +61 2 9012 6620 fax | peter.bis...@hp.com 36-46 George St | Burwood | NSW 2134 Australia -----Original Message----- From: BISHOP, Peter Sent: Friday, 2 October 2009 1:09 PM To: 'linux-390@vm.marist.edu' Subject: emulating a z/OS DDNAME dataset concatenation in Linux Hi, I've searched around and drawn a blank. What I'm wondering is whether there is a method in Linux that emulates a z/OS DDNAME's facility of allowing multiple datasets to be concatenated and effectively treated as one file. I looked at symbolic links, the "cat" command, variants of the "mount" command, but didn't see anything clearly supporting this. The ability supported by the DDNAME concept of not needing to copy the files to concatenate them is important as we want to avoid as much overhead as possible. What we'd like to do is run a job on zLinux that accesses multiple z/OS datasets in one "file", as is done with the DDNAME concept with z/OS JCL. Can NFS in some way support this? I think NFS will only use the "mount" command anyway, but has it another route than that? Thanks in advance for any help you can offer. Best regards Peter Peter Bishop HP Enterprise Services Asia Pacific South Mainframe Capability & Engineering +61 2 9012 5147 office | +61 2 9012 6620 fax | peter.bis...@hp.com 36-46 George St | Burwood | NSW 2134 Australia ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www.marist.edu/htbin/wlvindex?LINUX-390
