[CentOS] Rescan harddisk size without rebooting

William L. Maltby BillsCentOS at triad.rr.com
Sun Nov 13 12:58:03 UTC 2005

On Sat, 2005-11-12 at 22:28 -0600, Aleksandar Milivojevic wrote:
> kadafax wrote:
> > Hi list,
> > I have a SAN attached to a CentOS 4.2 server. I have expanded the size 
> > of the virtual disk within the SAN (by adding a new HD to the disk pool) 
> > and need CentOS to see the new size (CentOS see it as /dev/sdb). I'm 
> > using LVM. Do you  know a method for the Volume Group to see that one of 
> > its harddisk is now bigger, without rebooting (it's not a problem with a 
> > reboot but since the LDAP directory is on this server, it is problematic).
> If you do "fdisk /dev/sdb", does it show you correct (new) size?  Fdisk 
> should query device directly (and not relay on cached copy of partition 
> table in kernel).
> <snip>

A faster method is

    sfdisk -l [/dev/xxxx]   # If no device specification, lists all

and then

    sfdisk -R /dev/xxx

will load the disk parameters to the OS without reboot.

However, not being familiar with LVM, I don't know if this causes a
problem or if you just then follow the other directions given by

I have also used this for automated configuration. But that was without
LVM being involved.

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