COZBATCH z/OS to Linux large files transfer limitation

Discussion of the free COZBATCH utility for z/OS
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abertneski
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COZBATCH z/OS to Linux large files transfer limitation

Post by abertneski » Tue Sep 22, 2020 10:13 am

We are using COZBATCH to transfer from z/OS to Linux about 11,000 cylinders files, about 8,800 Mb of data, and it took about 3 to 4 hours. Can we split the files and how large the file should be to transfer faster in about 2 hours?

dovetail
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Re: COZBATCH z/OS to Linux large files transfer limitation

Post by dovetail » Tue Sep 22, 2020 3:58 pm

I would recommend that you first determine where the bottleneck is.

The best approach is probably to have a network engineer run something like wireshark on the running connection. This will tell you if you have packet loss, window full etc so that you can see where the bottleneck is. If this shows that there isn't a network or server bottleneck, then you would check that either batch job which runs CO:Z SFTP or the related z/OS Unix BPXAS address space that runs IBM OpenSSH isn't getting enough resources. RMF can help you there.

abertneski
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Joined: Tue Sep 22, 2020 8:36 am

Re: COZBATCH z/OS to Linux large files transfer limitation

Post by abertneski » Wed Sep 23, 2020 8:49 am

Don't you think breaking large file into smaller pieces and run in parallel would help? Thanks

dovetail
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Re: COZBATCH z/OS to Linux large files transfer limitation

Post by dovetail » Wed Sep 23, 2020 9:04 am

It depends on what the throughput bottleneck is.

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