Johan Hendriks wrote: >> I understood that labeling a disk with glabel would permit the disk to >> be switched to another system and booting from that disk would not >> require other manupulations than adjusting network configuration, >> > samba, > >> rc.conf and a few others.. >> But what if there is already a disk on the system with the identical >> labels in /dev/label/ ? >> I understood that whatever the actual disk might be (ad4, ad12, >> ad1...)would be irrelevant? >> It would appear that the actual booting goes according to the label; >> > so, > >> if there are duplicate labels the boot will not necessarily be from the >> newly installed disk if there is another disk with duplicate glabel >> > labels? > >> So doing a glabel seems superfluous... >> What then is the real purpose of glabel, since the boot process seems >> > to > >> need a unique identifier? >> > > Switching between machines is not what labels are for.(enlighten me if > it is) > As far as understand, it makes switching the drive in the same machine > easier. > It does not matter if labels are used, that the device is seen as > /dev/ad0 or /dev/ad{x}. > This makes adding and replacing disk much easier. > Sometimes the disk numbers change when removing raid controllers or > other hardware. > Here are my specifics: I just cloned disk - ad6 from ad12... I assume that the two are identical except for their bios assignments - that is ad6 and ad12. Other than that they are quite identical, or should be. ad12 was just glabeled, so I would assume that the clone would have all the identical information - anyway, it looks like it does. To test things, I booted from ad12 and then from ad6 but the boot is always from ad12 - this is evidenced from changing the motd on ad6s1a... the fstab on both ad4 and ad12 are identical... and dmesg shows the boot device... so, where have I erred?
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