We do use DASD mirroring at our shop but we recognize that there are situations that could arise that could corrupt the primary DASD as well as the Target DASD. We also have a point in time copy reflects the DASD as it looked after the completing of the last job of the cycle. So really to make DASD replication work you need 3 copies to cover yourself.
Having put all this in production we continue our tape DSSDUMP backups, once a week and keep for 3 cycles. What you should be really asking is how fast are you going to be expected to recover in the event of a real disaster? 1 or 2 hours?, than 3 sets of DASD copies makes sense. 24 hours?, than a tape solution might make sense depending on the size of your shop. CMS >>> "Gibney, Dave" <[EMAIL PROTECTED]> 10/16/2006 11:41 AM >>> We're thinking about dasd to dasd backups to cover these issues. > -----Original Message----- > From: IBM Mainframe Discussion List > [mailto:[EMAIL PROTECTED] On Behalf Of Shane > Sent: Monday, October 16, 2006 6:14 AM > To: [email protected] > Subject: Re: Storage Philosophy Question > > On Mon, 2006-10-16 at 07:33 -0500, Tom Marchant wrote: > > > Mirroring is great, but backups are still a good idea. > > I'd go even further. > Mirroring presumes the source is *always* valid - in fact > mirroring is great for propagating errors. Timely (tape) > backups are still mandatory. > If you rely on mirroring only, you'd better not get a > (shared) MCAT corruption - or any of the other critical exposures. > > Shane ... > > ---------------------------------------------------------------------- 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 ----------------------------------------- CONFIDENTIALITY NOTICE This e-mail is intended for the sole use of the individual(s) to whom it is addressed, and may contain information that is privileged, confidential and exempt from disclosure under applicable law. You are hereby notified that any dissemination, duplication, or distribution of this transmission by someone other than the intended addressee or its designated agent is strictly prohibited. If you receive this e-mail in error, please notify me immediately by replying to this e-mail. ---------------------------------------------------------------------- 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
