[CentOS] Rescan harddisk size without rebooting

[Bryan J. Smith]

kadafax <kadafax at gmail.com> wrote:
> Thanks for reply Bryan,
> in fact since the mounted FS is for backup purpose only,
> it's not a big deal to un-mount it (far better than
> disabling the ldap service with a reboot). I've checked
> google and the result it gives seems to be too 
> heavy for this production server (new scsi driver etc.). So
> if you have a solution who is working on un-mounted volume,
> I'm very interrested.
> PS: The SAN is an AX100sc from EMC. The host adapter is a
> QLA200 from QLogic. OS: CentOS 4.2

If all volumes are unmounted, then you can simply remove the
driver and modprobe it again.

E.g.,
  # /sbin/rmmod qla2200
  # /sbin/modprobe qla2200

I'm assuming your /etc/modprobe.conf file has all options
(SAN paths, etc...) for the card defined.

Once that is done, your /dev/sdb device should be updated to
reflect the new geometry of the storage.  Just add the new
space as a new, physical volume, add it to your existing
volume group, etc...



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