>Do you have any alternate authentication methods defined in /etc/nsswitch.conf The file loos like: passwd: files shadow: files group: files #hosts: db files nisplus nis dns hosts: files dns # Example - obey only what nisplus tells us... #services: nisplus [NOTFOUND=return] files #networks: nisplus [NOTFOUND=return] files #protocols: nisplus [NOTFOUND=return] files #rpc: nisplus [NOTFOUND=return] files #ethers: nisplus [NOTFOUND=return] files #netmasks: nisplus [NOTFOUND=return] files bootparams: nisplus [NOTFOUND=return] files ethers: files netmasks: files networks: files protocols: files rpc: files services: files netgroup: nisplus publickey: nisplus automount: files nisplus aliases: files nisplus >No it usually means you have a high IO wait or your CPU cores are nearly maxed out. No there is no io wait at that time. I test it. Regards, Mahmood ________________________________ From: Steven C Timm <[log in to unmask]> To: Paul Robert Marino <[log in to unmask]>; Mahmood Naderan <[log in to unmask]>; scientific-linux-users <[log in to unmask]> Sent: Sunday, June 2, 2013 9:10 PM Subject: RE: long time to login as root 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 ________________________________ 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