Magento2 - Loading different modules per environment

you can enable Enhanced emails functionality. This enables a new object in salesforce where all emails sent from/to salesforce are saved . You can write triggers and build reports on this object. Add these reports as dashboard components in a dashboard. I didn't understand what you meant by overwhelm the menu, but this works like any other custom object.

Update : You can use inbound/outbound email service feature for this. This would require some apex code to be written but basically using this, incoming/outgoing emails can be processed using apex code and saved in a different custom object instead of task (activity history related list)

• What is tmpfs?

Tmpfs is a file system which keeps all files in virtual memory. Read More

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• What is /dev/sdc1 and how can I use the enough space available (46G)

/dev/sdc1 is just another file system that you have created and mounted in your system. The mount point is /u000. Read more on mount points

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• how can I Know in which partition, MySQL has been installed?

• Which Partition will be used by MysQL to store data?

Check answer here

Quoting from answer in the link above:

mysql -uUSER -p -e 'SHOW VARIABLES WHERE Variable_Name LIKE "%dir"'

basedir gives the installation directory.

datadir gives the directory where the data is stored.

Refer here for a detailed explanation of each dir

--basedir=path

The path to the MySQL installation directory.

--datadir=path

The path to the MySQL data directory.

To check which filesystem (mount point) a directory belongs to:

For eg, if I want to find out which file system the /home directory belongs to, df /home

output:

/home                (/dev/sda4     ):  5895840 blocks     92467 i-nodes

where /dev/sda4 is the file system where the /home resides

Refer here to change the mount point of MySQL.