iscsi lvm and /dev and bootup

[Bryn M. Reeves]

Bryn M. Reeves wrote:
> Sounds like your VG has not been activated by your distribution's init
> sripts. Run "vgchange -ay external_iscsi" and the VG should be activated
> and made accessible, creating the entries in /dev. There's no need to
> use the /dev/mapper/$vg-$lv entries - for LVM2 devices, the /dev/$vg/$lv
> symlinks are guaranteed to be persistent.
> 
> What distro are you using here? Some perform a vgchange -ay from the
> iscsi initialisation script (Fedora and RHEL both do this). If that's

Actually, I'm wrong - for Fedora/RHEL/CentOS the vgchange is done from 
the netfs script rather than directly from the iscsi script, but only in 
the case that at least one entry in /etc/fstab or /etc/mtab has the 
"_netdev" option present.

RHEL/CentOS up to 5.2 have a bug in this script that may cause devices 
to be misssed due to not syncing up with udev - see:

     https://bugzilla.redhat.com/show_bug.cgi?id=452866

Looking on my f9 boxes, this bug still appears to be present in Fedora, 
will clone the BZ for rawhide if it's still there too.

Regards,
Bryn.