Hi Gordon, We are working toward making the root pool recovery process easier in the future, for everyone. In the meantime, this is awesome work.
After I run through these steps myself, I would like to add this procedure to the ZFS t/s wiki. Thanks, Cindy Gordon Johnson wrote: > I hope this thread catches someone's attention. I've reviewed the root pool > recovery guide as posted. It presupposes a certain level of network support, > for backup and restore, that many opensolaris users may not have. > > For an administrator who is working in the context of a data center or a > laboratory, where there are multiple systems, including some kind of network > attached storage, it works fine. However, my understanding was that > opensolaris was attempting to broaden its user-base by adopting capabilities > from the many flavors of linux, and (dare I say it?) even Windows (detailed > CIFS integration). > > The desire to make in-roads into the alternative workstation OS segment > implies that Sun and OpenSolaris anticipate more individual, desktop and > laptop-based users vice the Solaris previous sole focus on the server > segment. But the desktop and laptop-based crowd often do not have and NFS or > other storage server on their network. Many are simply home-users who want > an alternative to Microsoft or who hope to enhance their education in > commercial versions of UNIX via home-implementation. While they likely won't > have network storage available, most such users do have resources such as > additional hard drives, USB drives, eSATA drives, or USB solid state devices > available. > > For their use I threw together a root pool recovery procedure that uses an > additional disk attached to the machine requiring backup/recovery. In > developing this procedure the additional disk was attached to a free IDE/SATA > port on the motherboard. However, I believe it will work equally well for an > attached USB-disk or solid state memory device. > > PROCEDURE FOLLOWS: > __________________________________________________________ > > This instruction assumes that in the system bios is capable of choosing a > specific boot device and that the system is X86/64 rather than SPARC. > It also assumes that there are at least three disk devices available in the > system: > 1) A rootpool from which to take a backup. In this instruction this disk is > c0d1s0. > 2) An alternate disk which should become the new rootpool. In this > instruction this disk is c0d0s0. And to choose this method rather than > mirroring the original rootpool implies the the new rootpool disk may be > smaller than the old. > 3) A 'storage' zfs pool that is not the rootpool, nor the new rootpool, but > can serve as a storage cache for the system backup in place of a shared > network drive, NFS or other. > > These tasks were accomplished all from the first CD in a Solaris 10 > installation set because all efforts to send the recursive snapshot of the > rootpool while the system was in operation resulted in the system hanging. > > Your mileage may vary. However, I believe these instructions to be a safe > backup method for average users who work primarily with a single system, and > who may not have extensive network storage or other system support. > > These instructions were developed on Solaris 10 U6, October 2008, for an > X86-X64 system using an AMD64 processor. > _____________________________________________________________________________________ > 1. While booted interactively on your system, as root, perform the following: > > -Create a zfs storage pool to contain your zfs snapshots (if you don't > already have one). > EXAMPLE: > # zfs create storage/snaps > > -Create a recursive zfs snapshot of your rootpool using the command, > "zfs snapshot -r <rootpoolname>@<today'sdate:DDMMYYYY> > EXAMPLE: > # zfs snapshot -r rootp...@16012009 > > -Shutdown the system > EXAMPLE: > # init 0 > > 2. Insert or connect the new rootpool disk. > 3. Insert the Solaris bootable CD or DVD. > 4. boot cdrom > 5. Press 3 when prompted for interactive install. > 6. Press F_2 when prompted. > 7. Press 'Enter' when prompted. > 8. When interactive shell has started place mouse cursor in window as > indicated and press'Enter'. > 9. When prompted, place mouse cursor in window, per screen instructions, > press '0', then press 'Enter'. > 10. When interactive install console window appears, minimize it. > 11. Right click on the desktop and select 'Programs' and the sub-menu > 'Terminal...' > > All further instructions should be completed in the terminal. > _____________________________________________________________________________________ > > # zpool import > pool: storage > id: 2698595696121940384 > state: ONLINE > status: The pool was last accessed by another system. > action: The pool can be imported using its name or numeric identifier and > the '-f' flag. > see: http://www.sun.com/msg/ZFS-8000-EY > config: > > storage ONLINE > mirror ONLINE > c2d0 ONLINE > c3d0 ONLINE > > pool: rootpool > id: 8060131098876360047 > state: ONLINE > status: The pool was last accessed by another system. > action: The pool can be imported using its name or numeric identifier and > the '-f' flag. > see: http://www.sun.com/msg/ZFS-8000-EY > config: > > rootpool ONLINE > c0d1s0 ONLINE > > # zpool import -f rootpool > cannot mount '/rootpool': failed to create mountpoint > # zpool import -f storage > cannot mount '/storage': failed to create mountpoint > cannot mount '/storage/snaps': failed to create mountpoint > # zfs set mountpoint=/mnt storage/snaps > # zfs mount storage/snaps > # ls /mnt > # ls -la /mnt > total 516 > drwxr-xr-x 2 root root 4 Jan 16 2009 . > drwxr-xr-x 19 root root 512 Oct 27 10:04 .. > # zfs send -v rootp...@16012009 > /mnt/rootpool.16012009 > # zfs send -Rv rootpool/ROOT/s10x_u6wos_...@16012009 > /mnt/s10x_u6wos_07b.16 > 012009 > sending from @ to rootpool/ROOT/s10x_u6wos_...@16012009 > # zpool export rootpool > # zpool create -f -o failmode=continue -R /a -m legacy -o cachefile=/etc/zfs/ > zpool.cache rootpool c0d0s0 > # ls /mnt > rootpool.16012009 s10x_u6wos_07b.16012009 > # cat /mnt/rootpool.16012009 | zfs receive -Fd rootpool > # cat /mnt/s10x_u6wos_07b.16012009 | zfs receive -Fd rootpool > # zfs list > NAME USED AVAIL REFER > MOUNTPOINT > rootpool 4.92G 31.5G 37.5K legacy > rootp...@16012009 0 - 37.5K - > rootpool/ROOT 4.92G 31.5G 18K legacy > rootpool/ROOT/s10x_u6wos_07b 4.92G 31.5G 4.92G /a > rootpool/ROOT/s10x_u6wos_...@16012009 61.5K - 4.92G - > storage 84.0G 832G 19K > /storage > storage/snaps 5.09G 832G 5.09G /mnt > # zpool set bootfs=rootpool/ROOT/s10x_u6wos_07b rootpool > # zfs create -V 2G rootpool/dump > # zfs create -V 2G -b 4k rootpool/swap > # installgrub /boot/grub/stage1 /boot/grub/stage2 /dev/rdsk/c0d0s0 > # zpool export rootpool > # zfs unmount storage/snaps > # zfs set mountpoint=/storage/snaps storage/snaps > # zpool export storage > # init 6 > _____________________________________________________________________ > END PROCEDURE > > I hope someone finds this useful. > > V/R > > Gordon Johnson _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
