receiving more than 20 SHDWCBLK process running background when i try to shadow 5 namespace
Why i am receiving more than 20 SHDWCBLK process running background when i try to shadow 5 namespace ?
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https://dev.community.intersystems.com/post/receiving-more-20-shdwcblk-process-running-background-when-i-try-shadow-5-namespace
Consider using mirroring instead of shadowing.
We have a project which we are maintaining it from cache 5.0.21 using shadowing only, So we need exact number of process for 1 Namespace shadowing. Please advise..
The real question is why is that a problem? There are quite a few things involved in shadowing:
1) Processes retrieving/writing journal files
2) Dejournal reader process which reads those files and queues up records for sets/kills into database
3) Dejournal worker process which actually does those sets/kills
4) Dejournal prefetchers which fetch blocks from disk so 3) doesn't need to do disk reads itself
Most likely, you have 16+ dejournal prefetchers, optimizing the performance of shadowing keeping up with your source system.