Can't import Linux-created pool.

[tribals]

Hi there!

So, finally I've managed all my gotchas, re-partitioned an NVME SSD, and trying to give most of it's 1 TB to a pool shared between two OSes. I've created pool using Linux with common options (nothing special), and now trying to import it under Windows. Unfortunately, zpool doesn't see it. 🤷‍♂️

What I'm supposed to do, and which debugging information should I gather and provide? (I've looked to zpool-import man page, but there is no "verbose" output mode, so I can't provide anything in advance).

My setup is special as I can't install additional drive because my laptop has only one port. So I decided to try ZFS on the same drive for both OSes.

I really hate how each other's FSes supported on both (nohow for ext4 on Windows and somehow for NFTS on Linux), so ZFS become my only hope, to have "commonplace" for both and store much of "that unneeded nasty stuff like music, moves and so on" there (which also occupies the most disk space).

On Linux I've created a pool with GPT UUID (GUID, or PARTUUID in the lsblk speak) as a source. It that may be an issue?

It is not a problem to re-create it under Windows as it currently empty but I want to retain Linux as a main "keeper" of the pool, because I reboot into Windows only occasionally.

> zpool import -a
path '\\?\scsi#disk&ven_nvme&prod_samsung_***#*&***&*&000000#{53f5****-****-****-****-********fb8b}'
 and '\\?\PhysicalDrive0'
read partitions ok 7
    gpt 0: type daf2afd9d0 off 0x100000 len 0x20000000
    gpt 1: type daf2afd9d0 off 0x20100000 len 0x400000000
    gpt 2: type daf2afd9d0 off 0x420100000 len 0x1900000000
    gpt 3: type daf2afd9d0 off 0x1d20100000 len 0x9f4f600000
    gpt 4: type daf2afd9d0 off 0xbc6f700000 len 0x1000000
    gpt 5: type daf2afd9d0 off 0xbc70700000 len 0x18ff000000
    gpt 6: type daf2afd9d0 off 0xd56f700000 len 0x1908300000
asking libefi to read label
EFI read OK, max partitions 128
no pools available to import

The pool is on gpt 3 partition.

[lundman]

Hi there! OpenZFS on Windows certainly isn't a finished product, but if you are willing to help work through any issues, we can maybe get there.
Pools on partitions is not heavily tested, so it isn't too surprising perhaps that it doesn't see it - or rather, doesn't check inside gpt3. I can probably create a vhd and setup something similar and see if I can replicate the problem

[tribals]

Yeah... Nevermind.

Just rebooted into Linux (I didn't installed it yet, actually, so rebooted into a LiveUSB which has all needed tools), and looked at drive - Windows installer corrupted partition table (such a shitty OS)! Luckily, it wasn't a problem if such table stored at least three times (which is the case for GPT). So I restored it and after that I can now see the pool!

Sorry about this topic.

> zpool status
  pool: tank
 state: ONLINE
config:

        NAME                   STATE     READ WRITE CKSUM
        tank                   ONLINE       0     0     0
          Harddisk0Partition0  ONLINE       0     0     0

errors: No known data errors

[tribals]

What is real question is how to expose it to system... 😅

I've created a pool with option mountpoint=none, with assumption that I don't want it to be mounted as root in Linux, but instead somewhere under another (root) pool. And, I'm striving to not store any data on pool's root dataset, and thought that it is better to create datasets as needed. The idea was roughly as follows:

• root pool for ((Linux) system
• tank pool with mountpoint=none and dedicated datasets

Then each dataset will get mounted where it needed.

Now that I've set driveletter on tank, but it still has mountpoint=none which is inherited by child datasets. I've cerated just one, set it's mountpoint to /test, but still can't get it from windows.

C:\> zfs get driveletter tank
NAME  PROPERTY     VALUE        SOURCE
tank  driveletter  Z            local

C:\> zfs list
NAME        USED  AVAIL  REFER  MOUNTPOINT
tank        852K   616G    96K  none
tank/test    96K   616G    96K  /test

C:\> zfs mount
tank/test                       //./Volume{e59819f6-34ba-4734-87c2-a04a5567947c}/test

What I'm doing wrong?

[lundman]

Hmm you are better off making tank not set driveletter, and no mount, then set tank/test to driveletter Z.