UFS2 with SAN

[Julian Elischer]

Eric Anderson wrote:
> On 02/13/07 13:12, Julian Elischer wrote:
>> Eric Anderson wrote:
>>> On 02/13/07 12:09, Ivan Voras wrote:
>>>> Eric Anderson wrote:
>>>>
>>>>> You might look at tdfs (fuse module from Ivan Voras I believe).  It's
>>>>> probably horribly beta (not knocking it Ivan - I'm sure it's an 
>>>>> amazing
>>>>> start), so lots of testing would need to be done.  It's also most 
>>>>> likely
>>>>> not high performance.
>>>> Yes, I'm realistic about it - it is "horribly beta" :)
>>>>
>>>> Two reasons: one: I couldn't amass enough interested parties to help
>>>> test it (and possibly work on it), and second: while it's a nice 
>>>> problem
>>>> to tackle, I don't [yet] need it that badly to start working on it
>>>> outside of free time). In any case, TDFS doesn't have locking because
>>>> FUSE doesn't have it (or didn't when I started doing it), so it stays
>>>> single-writer-multiple-readers until that changes.
>>>>
>>>> I'm thinking of re-creating it in kernel mode (and in this form it 
>>>> could
>>>> also have locking) but not any time soon. Maybe during the summer (SoC?
>>>> probably.).
>>>>
>>>
>>> I've thought about this too - and even thought about making it a file 
>>> system layer, like nullfs, with a network-kernel piece to notify the 
>>> readers of changes, etc.  I'm not certain if it would work or not..
>>
>> it will be very interesting to see the outcome from Matt's cluster 
>> filesystem on Dragonfly.
> 
> 
> Is it actually being developed?  Last I checked, there was talk, but no 
> code.. :(

He's doing all the underlying stuff. for example he has done a lot in 
the VFS layer to get ready for it.. (e.g. cache coherency support).

> 
> 
> Eric