Difference between revisions of "ZVOL boot"
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Using the same steps to create the boot helper partition as [[ZFS on Boot]], you may install Mac OS X onto a ZVOL device and use it as your boot volume. | Using the same steps to create the boot helper partition as [[ZFS on Boot]], you may install Mac OS X onto a ZVOL device and use it as your boot volume. |
Revision as of 12:57, 6 July 2016
ZVOL Boot
Using the same steps to create the boot helper partition as ZFS on Boot, you may install Mac OS X onto a ZVOL device and use it as your boot volume.
Create zvol
# zfs create -sV 80g rpool/ZVOL/MacOS
Get the diskN for that device
# zvol=`ioreg -trn "ZVOL rpool/ZVOL/MacOS Media" | grep "BSD Name" | awk -F'"' '{print $4}'` (it would be nice if we could just # zfs get zvol-disk rpool/ZVOL/MacOS)
Erase and create a volume
# diskutil eraseDisk JHFS+ MacOS ${zvol}
Clone root
Clone an existing Mac OS
# rsync -axH --exclude=".Spotlight-V100" --exclude=".fseventsd" \ --exclude=".vol" "/Volumes/Macintosh HD/" "/Volumes/MacOS/"
Or use Apple System Restore
# asr --source "/Volumes/Macintosh HD" --target "/Volumes/MacOS" --erase
New install
It is possible, but requires a few steps, to install Mac OS onto a ZVOL with the standard Apple installer. Download the installer from the App Store, and create an installer flash drive. Boot into the Installer, with a standard Mac OS disk available Macintosh HD (that has ZFS installed).
From Utilities->Terminal you can:
# kextload "/Volumes/Macintosh HD/Library/Extensions/spl.kext" # kextload "/Volumes/Macintosh HD/Library/Extensions/zfs.kext"
At that point you need access to the zpool and zfs commands, which require the libzfs and libzpool libraries. To work around the install environment, simply:
# chroot "/Volumes/Macintosh HD" # zpool import
Or if necessary
# /usr/local/sbin/zpool import
This worked with El Capitan Install 10.11 and the signed O3x from Downloads. I don't remember which version of O3x, but I believe it was 1.4.5 or so.
Setup boot helper
See Boot.plist for sample plist files.