If I run performance monitor and log few counters for few hours, there will be a performance impcat on the server right? I checked the errorlog and event log and...

Where can I see the job history?

I got this, but how do I know that storage is active?

I am getting the result as many rows but  I only need rows showing errors.

I mean if a sever has two or three SQL Server Instances installed ,they will installed in seperate drives or same drive? Also, .mdf and .ldf files of master database...

Thanx.. I got it.

what is this line means:

Reply from 192.168.1.47: bytes=32 time<1ms TTL=128

And why is it done usally?

Well I got it. I would like to know how the data is seperated and kept in many servers.

Does the DBA manages all the above mentioned different kinds of servers?