Thanks Skip, for the depth of the reply, which I will get to digesting in the morning!
IBM seems to have muddied the terminology pool recently, and they have "Global Mirror" vs "zOS Global Mirror;" the latter formerly known as XRC and the former an unlimited-distance extension of "Metro Mirror," or PPRC. No active CPU at the remote end, implemented entirely between the controllers over >metro distances. This "Global Mirror" was considered preferable, as it requires no CPU running any licensed software at the remote end, and because it will also replicate updates to open systems data, which may or may not live in the DS8x-es in the future. Tom Sims ________________________________ From: Skip Robinson <[email protected]> To: [email protected] Sent: Wednesday, November 13, 2013 3:19 PM Subject: Re: Global Mirror for DR A terminology level set. By 'Global Mirror' I assume that you mean XRC, where a DFSMS task called SDM continuously transfers data updates from production disk controllers, stores the updates in journal data sets, then writes out to 'DR' DASD volumes in consistency groups. In order to 'pull' data via XRC, you need a running CPU at the DR location to host SDM. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
