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Your not being very descriptive.<br />
<br />
Is the drive letter the same on the new dag member as on seeding member?
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As Leroy has stated you need to provide us more info. Some of the things that can create issues with adding DAG members are the following...<br />
- networking is not set properly<br />
- Drive Letters or logical paths are not the same<br />
- Exchange Services are not stated<br />
etc...<br />
<br />
There are several reasons why something like this could fail. it would be helpful if you could provide an error message that you are receiving as a start.<br />
<br />
Will.
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i just want to know what can be issues for the same <br />
is there any permission issue also happen at the server level.
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We cannot give you an exact <b>reason</b> why your DAG might not allow you to add members. There are several different variables and unless we know what the error message is and exactly how you have configured your DAG we cannot tell you what might be causing the DAG add member to fail.<br />
<br />
Will.
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is there any permissions required at server level?
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while adding members to dag if we receive error then what can be the reasons for the same?
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while adding members to dag if we receive error then what can be the reasons for the same?

Your not being very descriptive.

Is the drive letter the same on the new dag member as on seeding member?

As Leroy has stated you need to provide us more info. Some of the things that can create issues with adding DAG members are the following...
- networking is not set properly
- Drive Letters or logical paths are not the same
- Exchange Services are not stated
etc...

There are several reasons why something like this could fail. it would be helpful if you could provide an error message that you are receiving as a start.

Will.

i just want to know what can be issues for the same 
is there any permission issue also happen at the server level.

We cannot give you an exact reason why your DAG might not allow you to add members. There are several different variables and unless we know what the error message is and exactly how you have configured your DAG we cannot tell you what might be causing the DAG add member to fail.

Will.

is there any permissions required at server level?

Dag Members addition

Exchange is the server side of a collaborative application product that is part of the Microsoft Server infrastructure. Exchange's major features include email, calendaring, contacts and tasks, support for mobile and web-based access to information, and support for data storage.