Re: Delete Records -File Re-org -- MIDRANGE-L

I am very hesitant about using calculated per hour costs because they are 
so often so flawed. Almost invariably they include overhead and 
administrative costs which will not go down if the machine is shut off.  I 
see these kinds of cost justifications done for outsourcing low-end jobs 
and all that really happens is some poor guy loses his job and the 
overhead burden for everyone else just went up because there are fewer 
workers over whom to spread the burden.  (Administration and management 
costs don't go down just because there are fewer heads to administer and 
manage.)   In this instance, that AS/400 is going to be there 24/7.  If 
the job makes them need a bigger machine then yes, there are some cost 
factors.  If the job can be run in slow hours and delays a new machine, 
then  yes, there are some cost factors.  But using "run-time cost" is only 
relevant if the job requires additional costs. 
_______________________
Booth Martin
boothm@earth.goddard.edu
http://www.spy.net/~booth
_______________________




Rob Berendt <rob@dekko.com>
Sent by: owner-midrange-l@midrange.com
02/21/2000 09:06 AM
Please respond to MIDRANGE-L

 
        To:     MIDRANGE-L@midrange.com
        cc: 
        Subject:        Re: Delete Records -File Re-org


Yes, and what about the cost of downtime?  Perhaps you can use the 
following equation:
R=Run rate of the application.  Or estimate of cost of downtime in 
Currency/Hour
D=Length of downtime
S=Cost of AS/400 storage.  Which in my experience is $0.60/meg
R$/Hour  *  D Hours  *  meg/$0.60  =  meg
So if your cost of downtime is $400/hour, and it took 3 hours to reorg 
your 
files, then you had better saved 2,000 meg or 2gig of dasd.  Otherwise 
your 
wasting your companies money that would have better spent buying DASD. 
Unless you dramatically increase response time.  And yes, there are 
formula's 
for response time.  IBM published a document years ago on the value of 
response 
time.  Batch is easy.  If it makes a job that ties stuff up faster, than 
use 
your run rate.  For example, if a batch job now finishes in 15 minutes 
versus 
30 minutes, and your run rate is $400/hour that you've saved the company 
$100 
in processing time.  BUT, if it takes 3 hours to reorg, and you only saved 

500meg of dasd and you only run this batch job once in a blue moon, then 
you've cost the company:
(3hours  *  $400/hour)  -  ($100 batch job)  -  (500 meg * $0.60/meg) 
= $1,200  -  $100  -  $300 
=  $800 of lost money





dgallagher@deloitte.ca on 02/18/2000 10:00:20 PM
Please respond to MIDRANGE-L@midrange.com@Internet
To:              midrange-l@midrange.com@Internet
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Fax to: 
Subject:                 Re: Delete Records -File Re-org

Phil:

As others on this list have said . . .there is absolutely, positively, no
question that you will save disk space by re-org'ing to get rid of deleted
records in files. You may have to find a way to break it gently to your
co-worker (or boss).

I will send you privately an article I wrote for TUG/400 magazine. It
outlines how to create a report that shows how much disk space is being 
used
by deleted records. At my previous employer, I ran this report every week 
to
see which files we should re-org at the next window in the data centre
schedule.

Due to application design (as Al Barsa mentioned), we were unable to 
change
all files to re-use deleted records. If my own experience with JDE support
is any indication, you will never get enough info from them to determine 
if
it is safe to change your files or not - so assume you can't. We also had
users in many time zones, so the window for doing re-org was usually small 
-
couldn't run them all or even a whole library every weekend.

As others mentioned, it will be difficult to know how long the re-org will
run the first time you do it - Pete outlined some of the factors. We used 
to
keep track in the data centre to help with planning. Once the re-org 
starts
to run, no one can use the file until the re-org is finished.

You will be able to prove to your co-worker (or boss) how much disk is
saved. Run the deleted records report before and after a re-org. The file
size and number of deleted records will be on the report.

Debbie Gallagher
dgallagher@deloitte.ca

------------------
Original message
------------------
From: pike4@ix.netcom.com 
Subject: Delete Records -File Re-org
>
>   <snip>   re-orgs on these files during the week end, and was told that
this doesn't 'really' save
space. <snip>
>Thanks,
>Phil Kestenbaum
>
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