Migrating Mirror Root Pool To New Laptop ... Recovery !!
By user12821160 on Apr 18, 2012
So I think about how to migrate my nice Mirrored root pool configuration over to my new laptop, would be really nice to not have to actually install on the new laptop, and turns out I really don't have to and I've managed to keep the new laptop as a dual boot machine as well.
NOTE : Ensure the new disk/partition size you will be adding is at LEAST as large as the existing zpool device.
Here's what I did to achieve this :
1. Shrink Windows 7 Volume
Laptop comes pre-installed with Windows 7 and I'd like to actually keep a minimal install of this just in case I need IE, but I'd rather it not use the entire disk obviously. Boot into Windows 7, and run the disk management tool (diskmgmt.msc). In here you can remove Data volumes (assuming they don't have any actual data that you need). Then attempt to shrink the main C: volume down to a preferred size.
For me it's a 320GB disk so I'd like to shrink C: partition down to about 50GB. Right click on the partition in disk management tool and select shrink volume. Initially it would only allow me to shrink to 100GB, as windows was encountering some unmovable files. To resolve, I turned of Paging, Hibernation and Restore and Backup, I could then shrink the volume. Before rebooting out of windows ensure to re-enable these services.
Once shrunk I have about 260GB of free unused space to use, to ensure windows functions later on, I create one large NTFS partition on this unused space, we'll be redefining this later on for our root zpool.
2. Configure New Disk For Solaris.
Before attaching our USB mirror and the device we need to perform a few configuration steps on the new Laptop's internal disk. Specifically creating a Solaris2 partition and labeling it.
Boot new laptop into a Solaris Live CD or Text Install environment, and get to a shell prompt. From here (as root), run format(1) to create a Solaris2 partition and label the partition.
$ format Searching for disks...done AVAILABLE DISK SELECTIONS: 0. c5t0d0
From this we can see the internal disk is device c5t0d0, using the format(1) command and fdisk option we need to remove the NTFS partition we originally created and replace it with a Solaris2 partion.
$ format c5t0d0
From menu displayed, choose fdisk option :
$ format> fdisk
This should show what current partition layout is. For me it's showing three NTFS partitions, the largest being partition 3, which is the one I created in Windows 7 of all the available left over space. Simply delete this partition via option 3 from the displayed menu. Before deleting make a mental note of the size of the partition specifically the starting cylinder and the length in cylinders. If using the whole disk then you can simply specify 100%.
Now to create the new Solaris2 partition choose Option 1 from the displayed menu :
SELECT ONE OF THE FOLLOWING: 1. Create a partition 2. Specify the active partition 3. Delete a partition 4. Change between Solaris and Solaris2 Partition IDs 5. Edit/View extended partitions 6. Exit (update disk configuration and exit) 7. Cancel (exit without updating disk configuration) Enter Selection: 1 Select the partition type to create: 1=SOLARIS2 2=UNIX 3=PCIXOS 4=Other 5=DOS12 6=DOS16 7=DOSEXT 8=DOSBIG 9=DOS16LBA A=x86 Boot B=Diagnostic C=FAT32 D=FAT32LBA E=DOSEXTLBA F=EFI 0=Exit? 1 Specify the percentage of disk to use for this partition (or type "c" to specify the size in cylinders). c Enter starting cylinder number: 7769 Enter partition size in cylinders : 41144 Should this become the active partition? If yes, it will be activated each time the computer is reset or turned on. Please type "y" or "n". y
As can be seen from above, choose option 1 to create a new partition, select 1, for SOLARIS2 type partition, and 100% if using the entire disk, other wise specify the starting cylinder and number of cylinders to use. These you will have written down from the NTFS partition you deleted. You may need to +1 to the starting point and -1 from total number of cylinders, and finally "y" to make partition active. You should then see something like the following :
Total disk size is 38912 cylinders Cylinder size is 16065 (512 byte) blocks Cylinders Partition Status Type Start End Length % ========= ====== ============ ===== === ====== === 1 NTFS 1 10 10 1 1 NTFS 10 7768 700 18 1 Active Solaris2 7768 38912 31145 80 SELECT ONE OF THE FOLLOWING: 1. Create a partition 2. Specify the active partition 3. Delete a partition 4. Change between Solaris and Solaris2 Partition IDs 5. Edit/View extended partitions 6. Exit (update disk configuration and exit) 7. Cancel (exit without updating disk configuration) Enter Selection:
Choose 6 to update disk configuration and exist fdisk and back to format(1) menu.
Now to label the disk, ensure a VTOC label is on the Solaris partition, sizes listed above and below are examples only and may not be what you will see on your actual disks.
$ format> partition PARTITION MENU: 0 - change '0' partition 1 - change '1' partition 2 - change '2' partition 3 - change '3' partition 4 - change '4' partition 5 - change '5' partition 6 - change '6' partition 7 - change '7' partition select - select a predefined table modify - modify a predefined partition table name - name the current table print - display the current table label - write partition map and label to the disk !
- execute , then return quit $ partition> print Current partition table (original): Total disk cylinders available: 9419 + 2 (reserved cylinders) Part Tag Flag Cylinders Size Blocks 0 unassigned wm 0 0 (0/0/0) 0 1 unassigned wm 0 0 (0/0/0) 0 2 backup wm 0 - 19453 149.03GB (19454/0/0) 312528510 3 unassigned wm 0 0 (0/0/0) 0 4 unassigned wm 0 0 (0/0/0) 0 5 unassigned wm 0 0 (0/0/0) 0 6 unassigned wm 0 0 (0/0/0) 0 7 unassigned wm 0 0 (0/0/0) 0 8 boot wm 0 - 0 7.84MB (1/0/0) 16065 9 unassigned wm 0 0 (0/0/0) 0 $ partition>
We need to ensure slice 0 is configured, in my case I configure it to be the whole size of the available partition, then actually label the partition.
$ partition> 0 Part Tag Flag Cylinders Size Blocks 0 unassigned wm 0 0 (0/0/0) 0 Enter partition id tag[unassigned]: root Enter partition permission flags[wm]: wm Enter new starting cyl: 1 Enter partition size[0b, 0c, 0e, 0mb, 0gb]: 19453c $ partition> print Current partition table (original): Total disk cylinders available: 9419 + 2 (reserved cylinders) Part Tag Flag Cylinders Size Blocks 0 root wm 1 - 19453 149.02GB (19453/0/0) 312512445 1 unassigned wm 0 0 (0/0/0) 0 2 backup wm 0 - 19453 149.03GB (19454/0/0) 312528510 3 unassigned wm 0 0 (0/0/0) 0 4 unassigned wm 0 0 (0/0/0) 0 5 unassigned wm 0 0 (0/0/0) 0 6 unassigned wm 0 0 (0/0/0) 0 7 unassigned wm 0 0 (0/0/0) 0 8 boot wm 0 - 0 7.84MB (1/0/0) 16065 9 unassigned wm 0 0 (0/0/0) 0 $ partition> label Ready to label disk, continue? y $ partition> quit
Again ensure disk is definitely labeled from the format prompt :
$ format> label Ready to label disk, continue? y
Choose label from the format(1) menu, and select "y". If prompted for specific label type, ensure to choose SMI. Once labeled choose quit to get back to shell prompt.
$ format> quit
3. Replacing Mirror Device.
My old laptop configuration consisted of an internal 200GB disk mirrored with an external 300GB USB drive, this resulted in a 200GB mirrored root pool. To migrate to new laptop I simply need my USB disk.
Again ensure new laptop is booted into a Solaris Live DVD or Text Install environment, and get to a prompt. Ensure the USB drive is attached to the machine, then simply import the degraded rpool.
$ zpool import -f rpool $ zpool status pool: rpool state: DEGRADED status: One or more devices could not be opened. Sufficient replicas exist for the pool to continue functioning in a degraded state. action: Attach the missing device and online it using 'zpool online' see: http://www.sun.com/msg/ZFS-8000-2Q scan: resilvered 181M in 0h0m with 0 errors on Fri Mar 30 10:32:13 2012 config: NAME STATE READ WRITE CKSUM rpool DEGRADED 0 0 0 mirror-0 DEGRADED 0 0 0 2000330655777608537 UNAVAIL 0 0 0 was /dev/dsk/c4t0d0s0 c6t0d0s0 ONLINE 0 0 0 errors: No known data errors
The UNAVAIL device from above is the original laptop's internal drive, which obviously is not available on the new machine. c6t0d0s0 is the USB device.
Now all we have to do is replace the unavailable device with the new internal disk partition we created above. Make sure you specify slice 0 e.g. s0
$ zpool replace -f rpool 2000330655777608537 c5t0d0s0
The old device will now get replaced with the new internal disk device and depending on the size will may take a few hours to resilver everything from the USB disk onto the new internal device. Once completed zpool status should look like following :
$ zpool status pool: rpool state: ONLINE config: NAME STATE READ WRITE CKSUM rpool ONLINE 0 0 0 mirror-0 ONLINE 0 0 0 c5t0d0s0 ONLINE 0 0 0 c6t0d0s0 ONLINE 0 0 0 errors: No known data errors
4. Install Grub To Internal Disk
Finally we need to install grub to the internal disk and ensure grub menu entries are correct for booting.
$ installgrub /boot/grub/stage1 /boot/grub/stage2 /dev/rdsk/c5t0d0s0
If you have other Dual bootable OS's you will need to edit /rpool/boot/grub/menu.lst and add entries for them here otherwise you won't be able to get to them. In my previous configuration I had consumed the entire disk on both devices for my root pool, in this case the grub menu entries are exactly the same for locating the disk and partition e.g. findroot (0,a) However my new scenario is slightly different, I am consuming the whole disk on the external USB disk but only partition 3 on the internal disk. Because of this I will need two separate grub menu entries depending on which disk I'd like to boot from. Here's an example of what mine looks like :
title Windows 7 rootnoverify (hd0,1) chainloader +1 title Internal Disk Solaris 11 findroot (pool_rpool, 2, a) bootfs rpool/ROOT/s11 kernel$ /platform/i86pc/kernel/$ISADIR/unix -B $ZFS-BOOTFS -v module$ /platform/i86pc/$ISADIR/boot_archive title USB Disk Solaris 11 findroot (pool_rpool, 0, a) bootfs rpool/ROOT/s11 kernel$ /platform/i86pc/kernel/$ISADIR/unix -B $ZFS-BOOTFS -v module$ /platform/i86pc/$ISADIR/boot_archive
Notice from above the only difference between the Internal disk and the USB is the findroot line for the internal disk showing 2 (partition 3), and on the USB disk 0 (partition 1).
Now export your new rpool and reboot, ensuring to remove the Live DVD/Text Install disc so that you boot from your new rpool.
$ zpool export rpool $ init 5
Power on your laptop and at the grub prompt edit one of the Solaris entries and put "-r" at end of kernel line, and then select 'b' to boot. This will boot solaris in reconfigure mode and will attempt to ensure all the correct devices are loaded for your new laptop. This only needs to be done once e.g. initial boot.
Now you may find other issues with various devices on your laptop, like display, wifi etc... but that's an entirely new blog...
5. Auto expanding to maximize available space.
In my situation my rpool size was constrained by my original Laptop's internal disk size of 200GB. After following the above steps I now have a 200GB rpool recreated however I know the USB drive is 300GB in size and I know the SOLARIS2 partition on my new internal disk is 260GB, so I have 60GB of unused space.
Zpools have a property 'autoexpand' which by default is set to 'off'. This property if set to true will auto expand the pool to whatever space it can on the devices attached to the pool. So I can now simply set this property to 'on' and I will get the unused space automatically in my pool: Before :
$ zpool list NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT rpool 180G 135G 51.2G 72% 1.00x ONLINE -Reset the autoexpand property, and re run zpool list.
$ zpool set autoexpand=on rpool $ zpool list NAME SIZE ALLOC FREE CAP DEDUP HEALTH ALTROOT rpool 260G 135G 131.2G 51% 1.00x ONLINE -
If the size does not automatically expand as you expect you may need need to check the s0 size on your disks, one of them may be hard set to the lower size than the actual space on that solaris partition. Changing the VTOC s0/s2 (change both if necessary), will not effect anything as long as you are not changing the starting cylinder. After the expansion has completed, reset autoexpand property back to it's default of off.
$ zpool set autoexpand=off rpool
6. Ensuring boot succeeds when one device is missing.Potentially a bug but on a default solaris install when I disconnect the USB device the laptop fails to boot, mainly as the root pool is in a degraded state because a device is UNAVAIL. Pools now have a property "failmode". By default this is set to 'wait'. If you change this to a value of "continue', boot should succeed.
$ zpool set failmode=continue rpool