Before that there was 56 fci. (Flux Changes per Inch)
Jim
On 3/30/2011 11:45 PM, Schuh, Richard wrote:
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Round tape reels! Now, that is old. Since I remember them too, we are both =
showing our age. Do you remember when the 200 bpi density?
Regards,
Richard Schuh
________________________________
From: The IBM z/VM Operating System [mailto:IBMVM@LISTSERV.UARK.EDU] On Beh=
alf Of Tom Huegel
Sent: Wednesday, March 30, 2011 8:37 PM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: DDR Question
Slight brain fart, I didn't even think of hardware compression duh! I guess=
the only real way to to do it is just experimentation.
I still seem to remember a program from long ago, and it may have been a VS=
E program, that would tell you how many bytes would go to the tape, in fact=
I think it told you how many feet of tape (2400/3400) would be used..
Thanks guys.
On Wed, Mar 30, 2011 at 5:14 PM, Tom Duerbusch<duerbus...@stlouiscity.com<=
mailto:duerbus...@stlouiscity.com>> wrote:
If you are doing software compression, then, perhaps use the Pipe DDR stage=
and route it to the "count" stage.
But knowing how much compression the hardware will do....not obvious to me.
However, once you do have a compressed tape, DITTO TMP will tell you how mu=
ch tape the compressed dataset took on the media.
Tom Duerbusch
THD Consulting
Rich Greenberg<ric...@panix.com<mailto:ric...@panix.com>> 3/30/2011 4:=
55 PM>>>
On: Wed, Mar 30, 2011 at 11:37:00AM -0700,Tom Huegel Wrote:
} That doesn't show the compressed byte count is (would be). The goal here =
is
} to be able to predict how many tapes I will need to do backups.
If you are doing hardware compression in the tape drive, I don't think
there is any way for DDR to know the compressed byte count. Software
compression, yes it would.
I suspect that the easiest way to determine the tape counts will be
experimentally.
--
Rich Greenberg Sarasota, FL, USA richgr atsign panix.com<http://panix.com>=
+ 1 941 378 2097<tel:%2B%201%20941%20378%202097>
Eastern time. N6LRT I speak for myself& my dogs only. VM'er since CP-=
67
Canines: Val, Red, Shasta, Zero& Casey (At the bridge) Owner:Chinoo=
k-L
Canines: Red& Cinnar (Siberians) Retired at the beach Asst Owner:Siberne=
t-L
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<DIV dir=3Dltr align=3Dleft><SPAN class=3D796074203-31032011><FONT face=3DA=
rial=20
color=3D#0000ff>Round tape reels! Now, that is old. Since I remember them t=
oo, we=20
are both showing our age. Do you remember when the 200 bpi=20
density? </FONT></SPAN></DIV>
<DIV><FONT face=3DArial color=3D#0000ff></FONT> </DIV>
<DIV class=3DSection1>
<P><SPAN style=3D"FONT-SIZE: 11pt; FONT-FAMILY: Arial">Regards,<BR>Richard=
Schuh=20
<?xml:namespace prefix =3D o ns =3D "urn:schemas-microsoft-com:office:offic=
e"=20
/><o:p></o:p></SPAN></P>
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<DIV> </DIV><BR>
<BLOCKQUOTE=20
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<DIV class=3DOutlookMessageHeader lang=3Den-us dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT face=3DTahoma size=3D2><B>From:</B> The IBM z/VM Operating System=20
[mailto:IBMVM@LISTSERV.UARK.EDU]<B>On Behalf Of</B>Tom=20
Huegel<BR><B>Sent:</B> Wednesday, March 30, 2011 8:37 PM<BR><B>To:</B>=20
IBMVM@LISTSERV.UARK.EDU<BR><B>Subject:</B> Re: DDR=20
Question<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>Slight brain fart, I didn't even think of hardware compression duh! =
I=20
guess the only real way to to do it is just experimentation.</DIV>
<DIV>I still seem to remember a program from long ago, and it may have be=
en a=20
VSE program, that would tell you how many bytes would go to the tape=
, in=20
fact I think it told you how many feet of tape (2400/3400) would be used.=
.=20
</DIV>
<DIV> </DIV>
<DIV>Thanks guys. <BR><BR></DIV>
<DIV class=3Dgmail_quote>On Wed, Mar 30, 2011 at 5:14 PM, Tom Duerbusch<=
SPAN=20
dir=3Dltr><<A=20
href=3D"mailto:duerbus...@stlouiscity.com";>duerbus...@stlouiscity.com</A>=
></SPAN>=20
wrote:<BR>
<BLOCKQUOTE class=3Dgmail_quote=20
style=3D"PADDING-LEFT: 1ex; MARGIN: 0px 0px 0px 0.8ex; BORDER-LEFT: rgb(2=
04,204,204) 1px solid">If=20
you are doing software compression, then, perhaps use the Pipe DDR stag=
e and=20
route it to the "count" stage.<BR>But knowing how much compression the=
=20
hardware will do....not obvious to me.<BR><BR>However, once you do have=
a=20
compressed tape, DITTO TMP will tell you how much tape the compressed=20
dataset took on the media.<BR><BR>Tom Duerbusch<BR>THD=20
Consulting<BR><BR>>>> Rich Greenberg<<A=20
href=3D"mailto:ric...@panix.com";>ric...@panix.com</A>> 3/30/2011 4:5=
5 PM=20
>>><BR>
<DIV>
<DIV></DIV>
<DIV class=3Dh5>On: Wed, Mar 30, 2011 at 11:37:00AM -0700,Tom Huegel=20
Wrote:<BR><BR>} That doesn't show the compressed byte count is (would b=
e).=20
The goal here is<BR>} to be able to predict how many tapes I will need =
to do=20
backups.<BR><BR>If you are doing hardware compression in the tape drive=
, I=20
don't think<BR>there is any way for DDR to know the compressed byte cou=
nt.=20
Software<BR>compression, yes it would.<BR><BR>I suspect that&nbs=
p;the=20
easiest way to determine the tape counts will=20
be<BR>experimentally.<BR><BR>--<BR>Rich Greenberg Sarasota, FL, U=
SA=20
richgr atsign<A href=3D"http://panix.com"; target=3D_blank>panix.com</A=
=20
<A href=3D"tel:%2B%201%20941%20378%202097">+ 1 941 378=20
2097</A><BR>Eastern time. N6LRT I speak for myself& my=
dogs=20
only. VM'er since CP-67<BR>Canines: Val, Red, Shasta, Zero=
=20
& Casey (At the bridge) =20
Owner:Chinook-L<BR>Canines: Red& Cinnar (Siberians) Re=
tired=20
at the beach Asst=20
Owner:Sibernet-L<BR></DIV></DIV></BLOCKQUOTE></DIV><BR></BLOCKQUOTE></BODY>=
</HTML>
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--
James Bohnsack
(972) 596-6377 home/office
(972) 342-5823 cell
