Reliability

A batch job can fail for a variety of reasons; bad input data, program error, hardware errors, space problems are just some. The real issue is that batch jobs are usually linked together, and if one fails, the rest wait on it being fixed. The odd failure here and there is not too much an issue, but if your failure rate is 2% or more, then you probably have an underlying problem. One way to investigate this, is to use the process below

Another example might be cartridge failures which trend to data creation on a particular cartridge drive. Get your maintainer in to fix it!

The one Storage item that is worth keeping an eye on is space allocations. There are three certain things in life, Death, taxes and data growth! If you allocate space through Data Classes, you need to review the values from time to time to see if they are still appropriate. You data will be growing, so make sure that your data classes keep pace. You should get very few space abends with a well designed DFSMS system, but keep an eye on the numbers and be prepared to tune DFSMS if you see too many SB37 or SE37 errors.

This stuff all sounds simple common sense, but there's little point spending a fortune tuning a batch run, if all you do is speed it on its way to the next failure.

However, with the best will in the world, you will still get batch failures from time to time. To make sure they are fixed correctly and quickly, you need to develop good, effective recovery procedures. With these in place, you should be able to cope with the occasional failure, without them delaying your systems too much.

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z/OS Storage and Datasets

Lascon updTES

I retired 2 years ago, and so I'm out of touch with the latest in the data storage world. The Lascon site has not been updated since July 2021, and probably will not get updated very much again. The site hosting is paid up until early 2023 when it will almost certainly disappear.
Lascon Storage was conceived in 2000, and technology has changed massively over those 22 years. It's been fun, but I guess it's time to call it a day. Thanks to all my readers in that time. I hope you managed to find something useful in there.
All the best