Re: Need help with live system expansion (zfs+geli)
Date: Sat, 17 Sep 2022 20:44:20 UTC
On Sat, Sep 17, 2022 at 2:42 PM milky india <milkyindia@gmail.com> wrote: > > > > On Sun, Sep 18, 2022 at 12:30 AM Alan Somers <asomers@freebsd.org> wrote: >> >> On Sat, Sep 17, 2022 at 2:25 PM milky india <milkyindia@gmail.com> wrote: >> > >> > >> > >> > On Sun, Sep 18, 2022 at 12:20 AM Alan Somers <asomers@freebsd.org> wrote: >> >> >> >> On Sat, Sep 17, 2022 at 2:03 PM milky india <milkyindia@gmail.com> wrote: >> >> > >> >> > >> >> > >> >> > On Sat, Sep 17, 2022 at 10:58 PM Alan Somers <asomers@freebsd.org> wrote: >> >> >> >> >> >> On Sat, Sep 17, 2022 at 12:52 PM milky india <milkyindia@gmail.com> wrote: >> >> >> > >> >> >> > >> >> >> > >> >> >> > On Sat, Sep 17, 2022 at 10:43 PM Alan Somers <asomers@freebsd.org> wrote: >> >> >> >> >> >> >> >> On Sat, Sep 17, 2022 at 12:31 PM milky india <milkyindia@gmail.com> wrote: >> >> >> >> > >> >> >> >> > Sorry about that, again - I'm not sure what you mean by bottom-post vs top-post. >> >> >> >> > >> >> >> >> > Be that as it may - I read the geli man page. I was specifically warned against using "geli resize" since it may not work as expected https://forums.FreeBSD.org/threads/how-to-extend-zfs-geli-encrypted-disk-space-not-showing.86447/post-581642 >> >> >> >> > Is this advise wrong? >> >> >> >> > > "The geli has autoresize flag which will handle the new provider size after gpart resize command." >> >> >> >> > followed by >> >> >> >> > > You are right, no geli resize needed. >> >> >> >> > >> >> >> >> > What would be the correct sequence of commands to fix this - Simply "geli resize" ? (the -s option seems to be additional, will it figure it out without providing s?) >> >> >> >> > >> >> >> >> > On Sat, Sep 17, 2022 at 10:20 PM Alan Somers <asomers@freebsd.org> wrote: >> >> >> >> >> >> >> >> top-posting is where you insert your reply above the previous email. >> >> >> >> Bottom posting is where you insert your reply below it, like I'm >> >> >> >> doing. The forum user said that you shouldn't need to run "geli >> >> >> >> resize" because the AUTORESIZE flag is on. But as you can see from >> >> >> >> your "geli list" output, it's actually off. So you need to run "geli >> >> >> >> resize". The "-s" flag should be unnecessary since your provider is >> >> >> >> already online. At any rate, you can try it both ways. You might >> >> >> >> want to make a copy of /var/backups/ada0p3.eli, just in case you make >> >> >> >> a mistake. >> >> >> > >> >> >> > Thanks - I hope I am bottom posting this as was expected of me. >> >> >> > >> >> >> > So if I understand correctly the AUTORESIZE flag is present for adaop2 and NOT for adap3 (which is the partition we are concerned about) - hence the advice given to not use "geli resize" isn't applicable here. Am I understanding this correctly? >> >> >> >> >> >> Yes >> >> >> >> >> >> > >> >> >> > > So you need to run "geli resize" >> >> >> > Is this the only command that I need to run to resize my geli partition? >> >> >> >> >> >> Yes >> >> >> >> >> >> > >> >> >> > > The "-s" flag should be unnecessary since your provider is >> >> >> > already online. >> >> >> > Ok thanks. >> >> >> > >> >> >> > >You might want to make a copy of /var/backups/ada0p3.eli, just in case you make a mistake. >> >> >> > Don't have the luxury of backup currently. >> >> >> >> >> >> Um, ok. I can't guess why you aren't able to do that, but it isn't >> >> >> strictly necessary. >> >> >> >> >> >> > >> >> >> > I suppose at the end of it - if this works - "geli list" would reflect the size to be 458G? (vs 290G currently) >> >> >> > And that's the output I can trust to have solved the issue - or is there more to it? >> >> >> >> >> >> Yes. >> >> > >> >> > > The "-s" flag should be unnecessary since your provider is already online. >> >> > When I try to run "geli resize /dev/ada0p3.eli" it complains. So I guess options s is must ? If yes - do I need to put in the exact size down to bytes from the output of geli list ? Under "Mediasize" ? >> >> > --------------------------------------- >> >> > geli: Option 's' not specified. >> >> > ---------------------------------------- >> >> >> >> Dude, it's easier just to try it, than to ask us. Go for it. The >> >> worst case scenario if you get the argument wrong is that nothing >> >> happens. >> > >> > >> > > The worst case scenario if you get the argument wrong is that nothing happens. >> > I'm not very sure if I put in the wrong value of s (old size) then "nothing happens" - I would imagine if I put in a size less than the current size then possibly the data after that get's lost? Or if I put in a size greater than the current size then there is a gap in the geli partition? >> > I sense some frustration in your reply - but I'm on a live system and wouldn't want to possibly risk it going kaput at this last step. That's the reason I'm trying to understand what is the best value of s for geli resize and how to obtain it. >> >> The purpose of the "-s" argument is to tell geli where to find the old >> label, if the provider isn't already attached. If you supply the >> wrong argument, then geli won't be able to find the label, and thus >> won't be able to do anything. It won't destroy any data, and it will >> always automatically determine the size of the current provider. Of >> course, if you're worried about losing data, you should always save a >> copy of /var/backups/ada0p3.eli, as I suggested. >> -Alan > > > >The purpose of the "-s" argument is to tell geli where to find the old > > label, if the provider isn't already attached. If you supply the > > wrong argument, then geli won't be able to find the label, and thus > > won't be able to do anything. > > I think you're confusing the -s argument with something else - the man page says it's for the old size - that's why I was trying to figure it out and still haven't been able to quite yet. Although I suspect the "Mediasize" output for p3 from "geli list" is what the s value should be - but not very sure : > ------------------------------------------------------------------------------------------ > Additional options include: > > -s oldsize The size of the provider before it was resized. > ------------------------------------------------------------------------------------------------ Yes, that's right. geli needs to know the old size of the provider in order to find the provider's old label.