On Sun, 2010-02-21 at 18:14 +0100, martin f krafft wrote: > also sprach Daniel Reurich <daniel@xxxxxxxxxxxxxxxx> [2010.02.19.0351 +0100]: > > But if a generated 'system uuid' value (I just suggested the root fs > > UUID because it would be highly unlikely to be unchanged, and nobody > > would be likely to fiddle with it) was copied into a file > > called /etc/system_uuid and copied into the initrd, then we could add > > put into mdadms hook script in initramfs-tools, to verify and update the > > homehost variable in the boot time required raid volumes when ever a new > > initrd is installed. (This generally happens on debian whenever a > > kernel is installed and mdadm is installed or upgraded. > > Neil's point is that no such value exists. The root filesystem UUID > is not available when the array is created. And updating the > homehost in the RAID metadata at boot time would defeat the purpose > of homehost in the first place. I said copy > > > As an added protection we could include checks in mdadm shutdown > > script a check that warns when mdadm.conf doesn't exist and the > > /etc/system_uuid doesn't match the homehost value in the boottime > > assembled raid volumes. If we did use the root filesystem UUID > > for this, we could compare that as well. > > Debian has no policy for this. There is no way to warn a user and > interrupt the shutdown process. We could use the mdadm to fix it though to ensure the system won't end up in an unbootable state. > > > It would be useful to have a tool similar to /bin/hostname that > > could be used to create|read|verify|update the system uuid, which > > would update all the relevant locations which store and check > > against this system uuid. > > Yes, it would be useful to have a system UUID that could be > generated by the installer and henceforth written to the newly > installed system. This is probably something the LSB should push. > But you could also bring it up for discussion on debian-devel. > I guess it's about time I subscribed to that list too then. -- Daniel Reurich. Centurion Computer Technology (2005) Ltd Mobile 021 797 722 -- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
