[CentOS] Mount USB disk at startup?

Mogens Kjaer mk at crc.dk
Thu Feb 11 08:44:41 UTC 2010

On 02/11/2010 01:26 AM, Jobst Schmalenbach wrote:
> There is a kernel option you can give to solve
> this problem, in /boot/grub/grub.con add to the end
> of the kernel line:
>   rootdelay Xs
> where x is the amounty of time to wait before
> /root is mounted, however this is valid for
> everything else as well.
> play with X until you get it right.

I've tried changing grub.conf into:

title CentOS (2.6.18-164.11.1.el5.centos.plus)
         root (hd0,0)
         kernel /vmlinuz-2.6.18-164.11.1.el5.centos.plus ro 
rootdelay=200 root=LABEL=/
         initrd /initrd-2.6.18-164.11.1.el5.centos.plus.img
title CentOS (2.6.18-164.11.1.el5)
         root (hd0,0)
         kernel /vmlinuz-2.6.18-164.11.1.el5 ro rootdelay=200 root=LABEL=/
         initrd /initrd-2.6.18-164.11.1.el5.img

but there's no delay at all (the "kernel" lines may have wrapped,
they are on one line in the file).

The kernel source has:

static unsigned int __initdata root_delay;
static int __init root_delay_setup(char *str)
         root_delay = simple_strtoul(str, NULL, 0);
         return 1;
__setup("rootdelay=", root_delay_setup);

and later:
         if (root_delay) {
                 printk(KERN_INFO "Waiting %dsec before mounting root 

The message "Waiting 200sec before mounting root device..." is never

Putting rootdelay= after root= makes no difference.



Mogens Kjaer, Carlsberg A/S, Computer Department
Gamle Carlsberg Vej 10, DK-2500 Valby, Denmark
Phone: +45 33 27 53 25, Mobile: +45 22 12 53 25
Email: mk at crc.dk Homepage: http://www.crc.dk

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