Ed, I disagree. It is instant. There is no propagation delay as the copy is available instantly - no big fat pipe required.
In the case of Copy on Write there may never be any propagation, so delay is zero IMNSHO and infinite in yours. How about a metaphor that a sysprogs will understand - CSA? There is one copy of CSA shared by all address spaces. Every address thinks it has its own copy of CSA, but there is just one common copy. If I make 20 *INSTANT* copies of a LUN using Copy On Write and mount them on 20 different servers I have a simile with CSA. One common set of storage used by 20 different servers. There is no big fat pipe required to do this. It is part of what the storage marketeers call *virtualisation*. People with an MVS background are usually the first to be comfortable with this. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of Ed Gould > Sent: Sunday, 19 February 2006 12:26 PM > To: [email protected] > Subject: Re: Disk vs Tape scenario > > Ron, > > OK but it is far from *INSTANT* the propagation delay is still there, > no matter how fat (big) of pipline you may have, right? > > Ed > > ---------------------------------------------------------------------- > 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 ---------------------------------------------------------------------- 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
