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I tried the DSPTAP command but it only shows the size of the objects saved, there is no indication on how much space is still available.

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Wow. Whoever answers this deserves to be revered as a community elder. – Ryan Ries Jan 6 '13 at 4:00
Why would you look on a tape to try to see how much space is available on disk ?? – WarrenT Jan 6 '13 at 5:20
os400 tag is missing – user130370 Jan 6 '13 at 12:04
I wouldn't say I miss OS/400 at all. And I think the current name is something like 'IBM i'. I think its included in the midrange tag, to be fair. – RobM Jan 6 '13 at 19:12

There's no way to know how much space is left on a tape mostly because this is abstracted away from the system (hardware compression, etc make it difficult to predict how much capacity is available on a tape in the first place). This isn't so much an AS/400 limitation as it is a limit in how tape devices are visible on any platform.

All you can do is issue DSPTAP DEV(TAPXX) DATA(*SAVRST) OUTPUT(*PRINT) to review what is on the tape, and compare that to the stated capacity figures for the type of tape you're using, but this won't give you a hard figure as to how much space is left.

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Many people try to save money by putting multiple backups on a single tape. For instance, Monday the 7th, Monday the 21st, Monday the 4th... It can be helpful to know whether 2 or 3 'Monday backups' will fit on a tape. In the old days we used to look at how full the reel was to get a rough idea. As @RobM says, there was never a way to get a hard number of bytes remaining, but sometimes an approximation is all that is needed. – Buck Calabro Jan 9 '13 at 18:24

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