Re: Incremental forever -- any problems?
Would your situation be a good reason for a separate domain
and offsite pool that would keep everything on their 'own' tapes??
Joseph A Faracchio, Systems Programmer, UC Berkeley
Private mail on any topic should be directed to :
joef AT socrates.berkeley DOT edu
(510)642-7638 (w) (209)483-JOEF (M)
On Tue, 18 Dec 2001, Nicholas Cassimatis wrote:
> The one topic no one is mentioning is Disaster Recovery. It's very hard to
> collocate an offsite pool. The only way to reduce the number of tape
> mounts is to do some type of full backup periodically (either backup or
> I started doing "full backups" of SAP filesystems after doing a DR with two
> 3590-B11's as my 3494 tape library. After 1800 tape mounts to restore
> /saparch, something had to be done. Watching TSM restore 1 file from each
> tape made it imperative. "Full backups" was the something (Note the quotes
> - see below). Taking "full backups" periodically drastically reduces the
> number of tape mounts needed to restore at a DR, since the data should not
> spread across more tapes than the number of days since the last full
> backup. So our 1800 mounts above comes down to 7, if weekly fulls are
> taken of the systems.
> Now comes the argument of "That's duplicating a lot of data!" Yes, it
> does. So figure out what needs to be restored in this way (the answer is
> "Not all of /saparch" for you SAP accounts out there) to bring the system
> back up in case of a disaster. Work with data owners to see what they need
> back immediately, and what can wait until after the system is back online
> and running. There's more in that second list than you may think!
> My "Full Backups" are therefore weekly archives of critical path data,
> which are kept for 2 weeks. At a DR, I do a retrieve, then a restore of
> the incremental data since the archive (then I script the retrieve and
> restore, just to speed it up even more, but that's a different thread).
> Nick Cassimatis
> nickpc AT us.ibm DOT com
> Today is the tomorrow of yesterday.