[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).
A faster method is
sfdisk -l [/dev/xxxx] # If no device specification, lists all
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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