Ultrium 4, Data size in TAPE?

240 pts.
Tags:
Backup
Entire System Backup
iSeries backup
iseries v5r4
LTO4
Storage
Tape backup
Ultrium
We are using LTO4 ultrium tape for backups in our server{V5R4}.

System Total Storage - 12TB

Present ASP              - 60% i.e.,{More than 6 TB}

For Entire System backup - Two Ultrium 4 tapes used. {which has the size of 1.6Tb each for compressed data = total  3.2Tb}

Question : Since the ASP is 60% we can predict approximately that the system contains more than 6Tb of data. While triggering an entire system backup how the 60%{6Tb} of ASP gets stored in two LTO4{3.2Tb} tapes?

Also Pls help me out how to find the data size in tape volume?



Software/Hardware used:
V5R4

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  • TomLiotta
    One way to track how much space is used is by having the save operations tell you. The SAV command for example has an OUTPUT() parameter that lists saved objects to a streamfile, a user space or spooled file. The SAVLIB command OUTPUT() parameter lists saved objects to a database file or spooled file. Saved objects are updated to show 'Offline size'. You can see that value by looking at the DSPOBJD display for an object. You can process the output files or streamfiles and retrieve each object description to total up the space. Of course, you don't actually need output from SAVxxx commands. You can simply create any list of objects and retrieve their object descriptions. If they show a save date that matches the latest save operation, then total up their 'Offline size'. However, those sizes won't be entirely accurate in terms of how much tape is used to hold a group of objects. As objects get larger, the accuracy goes up. But the more small objects you have, the lower the accuracy. That goes to the way that blocks are written to tape. See Mainframe Tape Details for an overall discussion. Also see Records, blocks, and formats in the Information Center. When you get a feeling how blocks, blocking factors and gaps between blocks fit into it all, reasons for difficulty in measuring tape usage might clear up some. Tom
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  • Explorer1910
    Thanxx Tom!!!
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