home *** CD-ROM | disk | FTP | other *** search
- Comments: Gated by NETNEWS@AUVM.AMERICAN.EDU
- Path: sparky!uunet!paladin.american.edu!auvm!ETSU.BITNET!CMS2
- Organization: East Tennessee State University
- Message-ID: <L-VMCTR%92112314040029@VM1.CC.UAKRON.EDU>
- Newsgroups: bit.listserv.l-vmctr
- Date: Mon, 23 Nov 1992 14:02:39 EST
- Sender: VMCENTER Components Discussion List <L-VMCTR@AKRONVM.BITNET>
- From: Bill Williams <CMS2@ETSU.BITNET>
- Subject: Re: Is anyone doing VM/Archive disaster recovery?
- In-Reply-To: Message of Mon, 23 Nov 1992 09:49:10 -0500 from <MBDMD@ROHVM1>
- Lines: 89
-
- On Mon, 23 Nov 1992 09:49:10 -0500 Martin J. Doyle (215) 752-2296 said:
- >Last week I posted a question asking for feedback on a proposed solution
- >from Systems Center for addressing disaster recovery concerns for
- >VM/Archive. I got only 2 replies. One response told me what they
- >were doing which is not an adequate for our shop's recovery requirements
- >and the other response basically said that Systems Center was goofy
- >to think people can implement what they suggested; he had worked in
- >two shops which both tried and failed at implementing the solution
- >proposed by Systems Center. I thought System Center's solution sounded
- >pretty difficult to implement which is why I asked the question.
- >
- >With so few replies I have to assume one of the following:
- >
- >1) Nobody on this list in interested in this topic. I find this hard
- > to believe because most of the people on this list seem to take
- > what they do too seriously to be apathetic.
-
- There is actually an alternate to this choice: some people are just sorta
- stunned by the concept because they *forgot* to consider the VMArchive
- tapes as what they actually are -- ARCHIVED DATA which probably is no
- longer still resident on that precious DASD that they backed up, image
- copied in duplicate and stored offsite in bootable form.
-
- Now the dummy who completely overlooked this glaring contradiction at
- this ...er a certain unnamed site... will not be identified for fear of
- embarassing myself. ...err him.
-
- >2) Nobody is providing disaster recovery for VM/Archive. Based on
- > what is available with the product I would bet that many people
- > have just given up on the possibility of recovering their
- > VM/Archive data in a disaster.
-
- We obviously are not currently providing this (see above remarks.) And
- after the subject came up I have pondered the remarks presented and tried
- to imagine just how one COULD go about providing this service within a
- reasonable framework as provided by VMArchive. I admit that I'm stumped
- as to how it could be done in a 'pure' form other than CLOSEing the
- VMArchive twin volume every day and taking it immediately to the offsite
- location. This flies in the face of the method I must use here -- Letting
- the tape volume load to near the end before it is closed. I do not have
- an abundance of tapes -- certainly not enough to satisfy a pool with a
- 365 volumes (assuming a year's worth) plus enough to handle the
- merge/purge condensation. (I'm still using round tapes.)
-
- BTW: There is one attribute of the merge/purge which I find annoying --
- writing an output file (HDR1/2, EOF1/2, tape-marks, etc.) for *every*
- file on the input tape set including a dummy for those which have
- expired. You lose more tape to HDR, EOF, etc. than you use in data in
- some cases, because at least the data is blocked whereas those HEADERS
- are F/80 with the standard large IRG eating up enough tape to hold
- several K of data.
-
- I suppose the best case for me is to do a more frequent merge/purge and
- store the twins of the MPU and all CLOSED volumes offsite -- risking only
- the data on the current open volumes.
-
- It ain't a perfect world, but it's gonna be the best I can do.
-
- >Which one is it? Doesn't anybody care or are the tools provided by
- >VM/Archive and the architecture of the product itself so limiting that
- >they just rule out disaster recovery? I personally feel that Systems
- >Center is out of touch with this issue and need to realize that many
- >people have just given up on disaster recovery of VM/Archive. If
- >people can't recover their data in a disaster they just can't afford
- >to use the product for production data.
-
- In thinking on this, I suppose my suggestion for a 'quick' fix by SCI to
- the problem would be some VMArchive CONFIG options coupled with a
- suitable special ONLINE pool which would be used to store "today's"
- VMArchived data. Part of the special CONFIG setup would be a cooperative
- interface (or detection) that VMBackup's SYSTEM BACKUP has backed up this
- ONLINE pool to the daily incremental, which has of course been TWINed and
- the twin is taken offsite. VMArchive could (via the CONFIG setup --
- possible coupled with a VMBackup CONFIG special) detect that the backup
- had been done and clear the ONLINE for use as the next standard backup of
- current archive data use. This would allow the VMArchive to continue to
- utilize his tape pools to a reasonable level *and* provide the recovery
- capability in the event of some unspeakable horror.
-
- Please, no flames. This is not intended as a well designed plan -- I'm
- just thinking out loud and everybody knows that my brain is unduly
- wrinkled.
-
- ---------------------------------------
- Bill Williams -- ETSU Systems Support
- East
- Tennessee (615) 929-6853
- State
- University <CMS2@ETSU.BITNET>
-