Mark - Right now we run tapes off-site once per day. And only on weekdays. In the worst-case scenario, we end up at the D/R hotsite with tapes suitable to recover to 70+ hours prior to the actual outage. Our Executive management has decreed that this is not good enough. Because of the increasing tie-in of electronic order processing and shop-floor control, they want no more than a three-hour data loss.
We can't get to this by shuttling tapes; we're going to need to move the off-line redo logs electronically. As for how often we need them -- we haven't - yet. They do get used in our twice yearly D/R recovery tests (as I write this the away team should have five systems running through mksysb restores; it's that time of year again :-). Current process - the logs get processed by brarchive/backint on a half-hourly cycle; two copies, to two different management classes and disk pools. The storage pools get copied once per day. This will be replaced by a triggered copy at the completion of the brarchive script, with both pools copying to tape to move off-site and one pool also copying to the off-site tape library. In general, *SM at our site is for D/R; any benefits we get in terms of local file recovery are a plus, but not the reason the product is installed. Tom Kauffman NIBCO, Inc > -----Original Message----- > From: Mark Stapleton [mailto:[EMAIL PROTECTED]] > Sent: Monday, November 12, 2001 1:31 AM > To: [EMAIL PROTECTED] > Subject: Re: TSM annoyances > > > On Wed, 7 Nov 2001 09:01:03 -0500, it was written: > >It can take two weeks to fill an > >LTO tape with our SAP/Oracle redo logs - but you need them > to recover to > >point of failure. These tapes tend to go off-site at about > 10% (of 95 GB). > >The reclaim starts just after they check out of the library. > We're trying to > >find an inexpensive way of moving these off-site > electronically, but we run > >from a low of 12 GB per day to an observed high of 45 GB per day. > > Think about the need for this (off-siting tape backups of log files). > > How often do you need the logs? How often during the day do you back > them up? How often have you had media failure that requires using the > copy pool copies? After thinking these through, how important *is* it > to offsite log files? > > I understand the administrator's desire to offsite 'em, but is there a > viable business case for electronic offsiting? If there's a tape drive > or tape volume bottleneck in conjunction with the redo log backups, > there is probably a need to review the resources you currently have, > with a thought toward increasing those resources. > > -- > Mark Stapleton ([EMAIL PROTECTED]) >