[oi-dev] Filesystems that both Unix and Linux can read

[Jean-Pierre André]

Stephan Althaus via oi-dev wrote on 8/17/25 9:42 AM:
> On 8/17/25 02:08, Bob Friesenhahn wrote:
>> If you are able to create the original zfs pool and filesystem format 
>> supported by Solaris 10 or OpenSolaris (before feature flags), then 
>> that should be a useful baseline which should work for Solaris, 
>> Illumos, FreeBSD, and Linux. That is provided that the OpenZFS 
>> implementations are respectful and do not automatically upgrade the 
>> pool version, or veer outside the bounds of the original 
>> specification. OpenSolaris and Illumos introduced the original feature 
>> flags so many of the feature flags should work with derivative zfs 
>> implementations.
>>
>> There is no substitute for testing!
>>
>> Bob
>>
>>
>> On Sat, Aug 16, 2025, 6:22 PM Atiq Rahman <atiqcx at gmail.com> wrote:
>>
>>     Hi,
>>     A file system related generic question:
>>
>>     I am looking to keep one of my GPT Partitions on my disk to be a
>>     file system that both Illumos (Solaris) / FreeBSD and Linux can
>>     read. This will be primarily to store data. I know there's vfat
>>     (fat32). Wanna know if there's anything better (non-MSFTish) out
>>     there.
>>
>>     Other than exfat, fat32 what else do we have?
>>
>>     I started using openzfs (which is at version 2.3.3 rn) on linux.
>>     However, there's probably a version difference with Illumos/OI.
>>     Since, I couldn't complete the OI setup on my machine yet I don't
>>     know what version of zfs we are using on OI. I am not quite sure
>>     if zfs will be a viable option due to lack of compatible versions
>>     (openzfs on linux and ZFS on illumos).
>>
>>
>>     Best!
>>
>>     Atiq
>>
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> 
> Hi!
> 
> Yes, if you use the "-d" option with zpool create, all of illumos, 
> Solaris 10+, BSD, Linux with installed ZFS support can read/write to it.
> 
> You are able to enable additional features one by one, whilst checking 
> if the features are available to all of you favorite OS.
> 
> BTDT.
> 
> BTW, i've tried a ZFS Package for Windows 1-2 years ago, that worked in 
> my test case..
> https://openzfsonwindows.org/
> 
> For my camera sd card i use EXFAT, there's a pkg on OI available (built 
> from https://github.com/relan/exfat.git - uses libFUSE)
> 
> 
> Regards,
> 
> Stephan
> 
> 
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> 

I also tried sharing a zfs partition over Linux and OpenIndiana
a few years ago, with consistent uids and gids across oses.

It worked, but it was a pita to have to do zpool import/export
when switching oses. Maybe this can be avoided, but I did not
know how.

Jean-Pierre