Date: Wed, 12 Dec 2001 17:22:03 +0100 From: Andrea Campi <andrea@webcom.it> To: Bakul Shah <bakul@bitblocks.com> Cc: freebsd-arch@FreeBSD.ORG Subject: Re: Real world Root Resizing (was Re: Proposed auto-sizing patch ... Message-ID: <20011212162203.GA9595@webcom.it> In-Reply-To: <200112092050.PAA26830@glatton.cnchost.com> References: <200112092050.PAA26830@glatton.cnchost.com>
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#include <std/disclaimer>
I was able to simple boot to single user and growfs my / without any magic.
I *might* have changed it to read-only just for safety but I don't think so.
After that of course I rebooted immediately...
Bye,
Andrea
On Sun, Dec 09, 2001 at 12:50:49PM -0800, Bakul Shah wrote:
> Changing sysinstall helps new installations but doesn't help
> existing systems with a "tiny" root fs -- something I had to
> fix recently. I was surprised to see how easy it was!
>
> Here is the procedure I used, in case anyone else needs to do
> the same. Assume ad0s1a is the root filesystem and ad0s1b is
> the swap partition and its size is atleast new root fs size +
> old root fs size. Do this as single user on a freshly booted
> system.
>
> 1. disklabel ad0s1 > label # save a copy of the disklabel
> 2. disklabel -e ad0s1
> if the new root size is N, change the b partition to start at offset N.
> make its size the same as partition a and make its type 4.2BSD type.
> 3. dd </dev/ad0s1a >/dev/ad0s1b bs=1m
> 4. fsck /dev/ad0s1b
> 5. echo 'boot_askname="YES"' >> /boot/loader.conf
> 6. shutdown -r now
> 7. boot in single user mode and when asked, choose the b partition as root.
> 8. disklabel -e ad0s1
> change 'a' partition size to N.
> 9. growfs -s N /dev/ad0s1a
> 10. fsck /dev/ad0s1a # just to convince yourself everything is okay
> 11. shutdown -r now
> 12. boot in single user mode and when aske, choose the a partition as root.
> 13. disklabel -e ad0s1
> restore the swap partition (to its new reduced size)
> 14. remove the change to /boot/loader.conf made in step 5.
> 15. reboot
>
> If there is an easier way, I'd like to hear about it. In
> particular if / can be switched at runtime, all of this can
> be done in one program without so many reboots. One can even
> write a program to shuffle filesystems around to grow any fs
> so long as there is some space somewhere!
>
> Disclaimer: use at your own risk. make backups and keep a
> cleenex handy in case you screw up. make notes while doing
> this to aid in debugging in case things go wrong.
>
> growfs should take an optional argument -A (for Auto :-) to
> grow a fs to fill up the partition. growfs needs to be
> renamed grow_ufs in case in future growfs is extended to grow
> other fs types. Ditto for newfs, dumpfs, tunafish and so on.
>
> -- bakul
>
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--
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