Re: determine how full a tape is

Based on Rob's instruction to use the PRTERRLOG cmd
I reset that stats, then ran this after next save, and from this
I "assume" it wrote 13.5 gig to a 30gb SLR60 tape (and the
13.5 gig is compressed data), so tape is 45% full.

Title . . . . . . . . . . :   Volume Statistics Report
System type . . . . . . . :   9406
System model  . . . . . . :   520
System release  . . . . . :   V5R3M0
System name . . . . . . . :   S102E68E
System serial number  . . :   10-2E68E
Report type . . . . . . . :   Lifetime Report

Volume          ---Temporary Errors---   --------M Bytes--------
ID                    Read       Write         Read      Written
IBMIRD                   0       66639            1        13563
                        0           0            1            1

indicates media replacement is recommended

> indicates media replacement criteria should be checked

jim

To: "Midrange Systems Technical Discussion" <midrange-l@xxxxxxxxxxxx>
Sent: Tuesday, November 15, 2005 3:28 PM
Subject: RE: determine how full a tape is

If a file has deleted records, they absolutely get saved to tape.

Al

Al Barsa, Jr.
Barsa Consulting Group, LLC

400>390

"i" comes before "p", "x" and "z"
e gads

Our system's had more names than Elizabeth Taylor!

914-251-1234
914-251-9406 fax

http://www.barsaconsulting.com
http://www.taatool.com
http://www.as400connection.com




            "phil Kestenbaum"
            <pkestenbaum@g-ii
            i.com>                                                     To
            Sent by:                  "Midrange Systems Technical
            midrange-l-bounce         Discussion"
            s@xxxxxxxxxxxx            <midrange-l@xxxxxxxxxxxx>
                                                                       cc

            11/15/2005 08:39                                      Subject
            AM                        RE: determine how full a tape is


            Please respond to
            Midrange Systems
                Technical
               Discussion
            <midrange-l@midra
                nge.com>






In line w/ this, I was wondering if there is a PF that has deleted records
on it, do they get saved to tape as well, whatever space they occupy on
Disk, does this get transferred to tape in full?

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx]On Behalf Of
qsrvbas@xxxxxxxxxxxx
Sent: Monday, November 14, 2005 11:38 PM
To: midrange-l@xxxxxxxxxxxx
Subject: RE: determine how full a tape is


midrange-l-request@xxxxxxxxxxxx wrote:

  1. determine how full a tape is (Jim Franz)

date: Fri, 11 Nov 2005 09:20:33 -0500

Is there a command or any other way to determine how full (a percentage?)
a cartridge tape is? Customer's backup is a single cartridge, and I am
preparing to add a large set of files. Need to see if nightly unattended

backup

will ask for 2nd tape. This is SLR60 tapes. Any formula w/block length and

file length from dsptap report?

I haven't looked into this for years. Back then, the unknown variable was
the size and number of inter-record gaps -- the unused space between the
end of one record/block on the tape and the start of the next. Gaps could
simply be between blocks within a tape file or between file, possibly
between the various file markers and the files, I'm not sure.

I'd swear that when I was looking into it, the storage density of tapes had

reached the point where there was often more space in the gaps than in the
actual data written to tape for many small files.

Because the ratio of gaps-to-data had gotten close to 1.0 in some cases,
estimating how much "space" was left got to be tricky. You might store 1GB
more on a tape if it was hundreds of small documents or 5GB if it was a
single large file. (Exaggerating... maybe?)

In months/years after, tape technology got so complex, I didn't even try to

search such things out anymore. Maybe somebody knows a site that has good
_useful_ info.

Tom Liotta

--
Tom Liotta
The PowerTech Group, Inc.
19426 68th Avenue South
Kent, WA 98032
Phone  253-872-7788 x313
Fax    253-872-7904
http://www.powertech.com


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