Predicting when we'll need an extra tape.

[rob@xxxxxxxxx]

We like to use the results of the PRTERRLOG TYPE(*VOLSTAT) to predict when 
we'll need another tape cartridge in our drive to perform the backup. 
However, it seems that some items can apparently write much more data to 
the cartridge.  I suspect that it depends on the compressibility of the 
data.  I combined all the output from our various boxes to one report:

Volume          ---Temporary Errors---   --------M Bytes--------  
ID                    Read       Write         Read      Written  
SFRI11                   0           0            1       336537  
GFRI11                   0           0            1        22664  
WFRI11                   0           0            1        18984  
DFRI11                   0           0            1       283125
DFRI21                   0           0            1       155981
HFRI11                   0           0            1       220831
6FRI1                    0           0            1       223611
6FRI2                    0           0            1       223913
6FRI3                    0           0            1       223380
6FRI4                    0           0            1       210898
01WK2                    0           0            1       117170
02WK2                    0           0            1       110359
03WK2                    0           0            1       105878
04WK2                    0           0            1       112585
05WK2                    0           0            1       114559
06WK2                    0           0            1        65112

All backups except for the ??WK2 set were done to 3582 LTO2 tape drives. 
The ??WK2 was done to a 3581 LTO1 tape drive.

The S* backup was from a combination of libraries and IFS objects on our 
development partition on the 520.
The G* backup was from a combination of libraries and IFS objects on a 
little test 270 that's hardly ever used.
The W* backup was from a combination of libraries and IFS objects on a 
partition on our 570 that is mostly Domino.
The D* backup was from Domino IFS objects on our busy partition on our 
570.
The H* backup was all of our BPCS, payroll, and some IFS objects other 
than Domino on our busy partition on our 570.
The 6FRI* backup was a SAVOBJ of some huge highly compressed objects in a 
library created by the old ADSM (being phased out by TSM on this machine)

Problem statement:
How can I tell when the S* backup will need another tape cartridge?


6FRI* backup SAVOBJ does the following:
Library     Object                            SIZE   Object    Object 
                                                     Type      Attribute 
PCBACKUP    PCBACKUP00             262,209,286,144   *FILE     PF 
PCBACKUP    PCBACKUP01             262,209,286,144   *FILE     PF 
PCBACKUP    PCBACKUP06             104,884,985,856   *FILE     PF 
PCBACKUP    PCBACKUP07              52,445,650,944   *FILE     PF 
PCBACKUP    PCBACKUP11              52,445,650,944   *FILE     PF 
PCBACKUP    PCBACKUP12              52,445,650,944   *FILE     PF 
PCBACKUP    PCBACKUP02              52,443,553,792   *FILE     PF 
PCBACKUP    PCBACKUP03              52,443,553,792   *FILE     PF 
...



Rob Berendt
-- 
Group Dekko Services, LLC
Dept 01.073
PO Box 2000
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com