On Mon, 17 Dec 2012 16:00:06 -0600 dweimer <dwei...@dweimer.net> wrote:
> I recently migrated a machine that was built on a VM to physical > hardware using the zfs send -R option against a snapshot of its root > zfs setup. I went from smaller drives to larger, both using a > mirrored zpool. However the devices were different, the device IDs > on the VM were da0 and da1, the device IDs on the physical hardware > were ada0 and ada1. I had used labels when creating the gpt layout > to plan for this. And all worked great, in fact it was the fastest I > have ever converted a virtual machine to a physical machine. > After I finished though, I got curious, was it actually necessary > for me to mount the new boot zfs partition while running on the live > cd and copy the zpool.cache file I had created when creating the > zpool or would have the existing cache file that would have been > included in the zfs send contained the right information? As the > zpool was pointed at the gpt label devices, or was the fact that the > size changed enough difference that copying the file was indeed > necessary? > I fear you might be mixing things up here. You did a zfs-migrate, not a zpool-migrate, you created a new zpool and received the datasets on that new zpool, even if the zpool names were the same. The function of zpool.cache is to tell the OS about available device-zpool combinations. Without, the OS does not know which zpools are available and accordingly cannot mount the root-ZFS passed in the vfs.root.mountfrom directive in loader.conf, which is why you needed to copy the zpool.cache and, if you changed the zpool-names, needed to adapt loader.conf. There are plans to change this behaviour, as it is deemed superfluous at least in the case of disks, but I do not know how much that has progressed so far. http://lists.freebsd.org/pipermail/freebsd-fs/2012-October/015328.html Hope I could shed some light on that issue, although I am by no means an expert on this. Cheers, -- Christopher TZ: GMT + 2h GnuPG/GPG: 0xE8DE2C14 Punctuation matters: "Let's eat Grandma" or "Let's eat, Grandma" - Punctuation saves lives. "A panda eats shoots and leaves" or "A panda eats, shoots, and leaves" - Punctuation teaches proper biology. _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscr...@freebsd.org"
