Do you have any alternate authentication methods defined in /etc/nsswitch.conf

Such as NIS? That can make things take a while.  It will look at NIS even for the root account.

Steve

From: [log in to unmask] [mailto:[log in to unmask]] On Behalf Of Paul Robert Marino
Sent: Sunday, June 02, 2013 7:45 AM
To: Mahmood Naderan; scientific-linux-users
Subject: Re: long time to login as root

No it usually means you have a high IO wait or your CPU cores are nearly maxed  out. Note heavy reliance on swap space due to insufficient ram can cause high IO wait too.

-- Sent from my HP Pre3

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On Jun 2, 2013 5:26 AM, Mahmood Naderan <[log in to unmask]> wrote:

Hi

Whenever I enter the root password after "su" command, it takes about 13 seconds!! to see the root prompt.

Is that normal?

Regards,
Mahmood