Re: [MacZFS-devel] OpenZFS ZFS-OSX: reduction of bugs(s) that affect some uses of home directories

[Jorgen Lundman]

>
> Jorgen, please: are the symptoms in your case similar to those in Brendon's
> case? Can you add any additional description of the sequence of events and
> symptoms/deterioration?


I think there are two (or maybe three) things at play. Running out of
memory is a definite issue. Need a better way to detect memory pressure and
react to it. This can be triggered by large data writes.

2nd issue appears to stall without any data issue, just having ZFS on home
directory. I have done some fixes in condvar and the reclaim thread that
might be related, but it is too early to tell just yet.

Lund

>
> ----
>
> For reduction purposes, you might try the following:
>
> 01) OS X 10.8.4 or 10.8.5 in a virtual machine
>
> � there's not yet a kernel debug kit for 10.8.5, if that's relevant
>
> 02) in the virtual machine, use ZFS-OSX to create a pool
>
> 03) in the VM, make a subdirectory of a ZFS file system an AFP share point
>
> � not the root of a file system
>
> 04) in the VM, make a subdirectory of that share point an AFP home directory
>
> 05) use a physical machine as the client; log in to the AFP home directory.
>
> OS X Server <https://itunes.apple.com/gb/app/os-x-server/id537441259?mt=12>
> may streamline part of what's above.
>
> Whilst I have not taken that approach, my instinct is that � *if* there's a
> mass of home directory data and relatively heavy usage � server-side,
> you'll observe some thought provoking behaviours (or clear issues).
>
> AFP homes on ZFS (is it even possible?) may be not a realistic use case,
> but I reckon that somewhere amongst the behaviours:
>
> * you'll find a clue to the #1 cause of home directory issues where there's
> _not_ AFP.
>
> Hope that helps. I understand that developers might require a more focused
> approach ;-)
>
> Graham
>
> --
> See http://MacZFS.org/ for more information on this project.
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--
Jorgen Lundman | <lun...@lundman.net>
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[Graham Perrin]

On Wednesday, 16 October 2013 03:16:07 UTC+1, lun...@lundman.net wrote:

Re: [MacZFS-devel] OpenZFS ZFS-OSX: reduction of bugs(s) that affect some uses of home directories

 

… Running out of memory is a definite issue. Need a better way to detect memory pressure and react to it. This can be triggered by large data writes. …

Thanks. The memory branch is noted: <https://github.com/zfs-osx/zfs/tree/memory>