Ted, I think that why us DASD vendors invented Concurrent Copy, Snapshot, Shadowimage, Timefinder and FlashCopy. The backup is done relatively quickly, and copying the backup to tape can be completed outside the Business Critical Path.
I'm not suggesting for a moment that everyone uses these products. I did say that the increase cost and time for backup needs to evaluated against any improvement in restoration time with hardware compression. Thank you to all those that reinforced the need for this evaluation in their response. > -----Original Message----- > From: IBM Mainframe Discussion List [mailto:ibm-m...@bama.ua.edu] On Behalf Of > Ted MacNEIL > Sent: Thursday, December 02, 2010 1:14 PM > To: IBM-MAIN@bama.ua.edu > Subject: Re: [IBM-MAIN] Hardware-assisted compression: not CPU-efficient? > > >opposed to back-up duration which is usually outside of > any business critical path. > > It shouldn't be, especially if back-ups have to complete before sub-systems > can come up. > > If we ran out of window, we had senior IT management and business contacts > decide which was more critical: back-up; availability. > > Sometimes, like during the Christmas shopping season the decision was > availability. > > But, that was mortgaging the future. > Recovering without back-ups during your peak season takes longer than during > 'normal' times. > > We never had to run recovery when we made the decision, but I was glad I > didn't have the responsibility to make the choice. > > Back-ups are insurance premiums. > If you pay and nothing happens, it's a business expense. > If you don't pay and something happens, it may be a career event! > > - > Ted MacNEIL > eamacn...@yahoo.ca > > ---------------------------------------------------------------------- > For IBM-MAIN subscribe / signoff / archive access instructions, > send email to lists...@bama.ua.edu 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 lists...@bama.ua.edu with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
