Ed, The initial size limit of the EAV is still quite small compared to common usage on other platforms and applications.
It is quite common for Open Systems to have just one to LUNs (volumes) per 8 disk parity group, so volume sizes of 100 to 500GB are quite common. Some applications like film rendering want as large a single LUN as possible, so 1TB LUNs are already common in that line of business. Backup and restore based on full volume dumps may become an issue. I think MVS is the only OS I come across where this is a common method. Most backup software in the Open Systems world operates off volume level clones, but backs up at the file level. If you expect to go to Extended Volumes in big way then a file level backup strategy should be given some consideration. Ron > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On > Behalf Of Edward Jaffe > Sent: Thursday, August 14, 2008 8:43 AM > To: IBM-MAIN@BAMA.UA.EDU > Subject: Re: [IBM-MAIN] Here we go again (was z/OS Hot Topics 19) > > McKown, John wrote: > >> Getting the 'star' treatment is the all new 3390 Model A introduced > in > >> z/os 10. This is a logical DASD volume with a slight increase in the > >> architectural limit of 65,520 cylinders to 268,434,453 > >> cylinders. Gulp. > >> Did he say 268 mega cylinders? Yup. > >> > > Nah, call it the 3390EL for "Excessively Large". I cannot imagine > > backing that monster up. But, then, compared to my PC's 500 Gb > drive??? > > > > 500 GB is nothing compared to the architectural limit for EAV. We're > talking about over two hundred terabytes per volume! > > Fortunately, IBM has taken a sensible approach and merely quadrupled > the > maximum volume size for the first generation of EAV over the existing > 54GB per volume limit for shark/ESS. > > Once the performance issues are identified and dealt with, much larger > individual volume sizes should be possible. We could be looking > terabyte-sized volumes within just a few years! > > -- > Edward E Jaffe > Phoenix Software International, Inc > 5200 W Century Blvd, Suite 800 > Los Angeles, CA 90045 > 310-338-0400 x318 > [EMAIL PROTECTED] > http://www.phoenixsoftware.com/ > > ---------------------------------------------------------------------- > 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
