Hi @02sangeet,
about the first error, the correct paramer is:
maxTotalDatasizeMB = 1024
as you can see at https://docs.splunk.com/Documentation/Splunk/8.0.1/Admin/Indexesconf
About the second, I don't see any formal error, are you sure of value of 4? default is 300!
check if there's a special char like tab.
Ciao.
Giuseppe
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