63 lines
6.6 KiB
Plaintext
63 lines
6.6 KiB
Plaintext
[[toc]]
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# Preface
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Having had some failed system updates on my MacBook Pro5,5 that caused Mac OS to be nigh unusable, I decided to swap out the original 500GB HDD for a much smaller -- but much faster -- 128GB SSD I had on hand.
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Although this is certainly a size constraint, I keep majority of my large data elsewhere and can easily access them via remote sharing or various web interfaces, so it is a moot point.
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# The Notion
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The original idea was to have three major partitions: Mac OS High Sierra, Arch Linux, and a shared partition that would store my user/home directory. The reason for this is that I primarily do cross-platform development and would like my two preferred operating systems to be available during travel.
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The initial setup and install -- which took some time due to learning how to setup rEFInd and much fury at the more modern Disk Utility.app's insane pie chart partitioning system -- used HFS+ for High Sierra, ext4 for Arch, and HFS+ for the shared partition.
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[](zfs-macos-arch-linux-dual-boot/dreaded-pie-chart.png)
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From Linux's perspective, the total partitions, with the important three noted, were:
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| # | Name | Description | FS | Size |
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|-----|------------|-----------------------------------|------------|----------|
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| 1 | EFI | EFI boot partition | FAT | 200 MB |
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| 2 | **Tyger** | High Sierra system partition | HFS+ | 36.6 GB |
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| 3 | Recovery HD| High Sierra recovery partition | Apple boot | 619.9 MB |
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| 4 | **Lyon** | Shared partition | ? | 55.9 GB |
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| 5 | **Lyger** | Arch Linux system partition | ext4 | 18.3 GB |
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Before and after each of the Tyger, Lyon, and Lyger partitions I also placed 128MB of free space as per Apple's recommendations.
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# The Problem
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After the initial install of both Arch Linux and Mac OS -- along with rEFInd -- I was met with a potential problem. HFS+ write access under Linux is experimental and must be enabled with the force option during mount. Although I was uncertain as to what potential issues could arise from forcing R/W HFS+ access, as it seemed to work during initial tests, I did not feel comfortable with keeping HFS+ as the shared partition in the event of file loss or corruption.
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After an initial review of the potentially shared options of NTFS, HFS+ R/W or using ext4 via FUSE on Mac OS, I came to the conclusion that none of these were very good options. In the case of HFS+, it was uncertain what extended use would lead to, and in the case of ext4, the only reliable ext3/ext4 R/W "driver" came at a bit of a cost (not much, by any means). NTFS was denied on the principle of it -- if I was triple booting, NTFS might have been the choice, although permission incompatibility would probably deny the shared user directory design.
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With this, I then thought of another project I was working on...
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# The Solution
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Having recently delved into ZFS -- a filesystem I hadn't touched since late-2000s with Solaris -- for a Debian office server, I realized that the answer to my problems could potentially be **ZFS**.
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A quick search revealed that the [OpenZFS on OS X](https://openzfsonosx.org) project had matured much since my last viewing (as I had noticed of the [ZFS on Linux](https://zfsonlinux.org) project some weeks prior).
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I began first by installing and setting it up on Arch Linux, following the guide [here](https://wiki.archlinux.org/index.php/ZFS). Once this was complete, I simply issued the basic commands to setup a zpool:
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sudo zpool create Lyon /dev/sda4
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With this, the zpool *Lyon* was created, allowing me to copy over my home directory and begin using it by setting my entry in `/etc/passwd` to point to the appropriate Lyon zfs volume. I rebooted into Mac OS and issued the standard `sudo zpool import` and discovered that the Linux-made ZFS pool had setup an extended Linux-centric option that rendered it only able to mounted as read-only in Mac OS. This would not do, so I issued `sudo zpool destroy Lyon` and recreated it on Mac OS with `sudo zpool create Lyon /dev/disk0s4`. With this in place, I switched back to Linux and confirmed that it had R/W access to the same pool.
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With the zpool working and visible between both, I decided to set up a generic *Users* volume within the *Lyon* zpool in the event of adding additional volumes or otherwise. This was merely a matter of issuing:
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sudo zfs create Lyon/Users
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sudo zfs set com.apple.mimic_hfs=on Lyon/Users
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and thereafter moving the Mac OS partition's *Users* contents to it and setting up the appropriate mount paths. As noted, I additionally enabled the *com.apple.mimic_hfs* setting in the event that I might run into problems with programs such as Photos (as indicated by the OpenZFS wiki).
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On Mac OS, I backed up the root */Users* directory, deleted the original, issued `zfs set mountpoint=/Users Lyon/Users`, then moved the original */Users/* contents into the mounted share.
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On Linux, I logged in as root, simply used the same */Users/* mount point and set my */etc/passwd* user entry to use */Users/kts*, as I do not know if it is possible to have a ZFS volume have different mount locations based upon the current host. Additionally, I modified my user entry in */etc/passwd* to use the same UID as used in Mac OS so there wouldn't be mismatched ownership. I additionally added a new group that matched Mac OS's *staff* GUID and made it my primary.
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With all this in place -- and omitting some some minor mistakes along the way -- I safely rebooted back to Mac OS. However, upon attempting to login, it seemed the ZFS filesystem *Lyon/Users* was not mounted to */Users* when I logged in. After some research into the matter, it appeared that mounting ZFS volumes takes some time to actually mount. After some initial tries with some basic LaunchDaemon scripts, I discovered [ZFSLoadCheck](https://github.com/alexwasserman/ZFSLoadCheck), a rather simple LaunchAgent application that polls for a hidden dot file in the */Users* location and lets you know if it finds that file or not. It does so by showing a small dialog on the Login screen that updates about every 5 seconds to let you know if it is yet time to login.
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[](zfs-macos-arch-linux-dual-boot/ZFSLoadCheck.png)
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After putting **ZFSLoadCheck**'s files into place, I rebooted between Mac OS and Arch Linux multiple times and was able to log in perfectly each time -- providing I waited a few moments for the ZFS volumes to actually mount.
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And, with that, finally, **shared ZFS on Mac OS & Linux was a success!**
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