OS:linux redhat as, zcs6.0 oss .
I have two questions:
1 Does the installation of zcs will modify linux os kernel?

2 How to add 100,000 or 1,000,000 users into zcs6.0 quickly?
I tried uapi < filename , cat filename:
ca user1@domain pwd
ca user2@domain pwd
ca user3@domain pwd
...
but always show me some connection mistakes, some suggestion?