[clue-tech] "rewindable" drive?

[Angelo Bertolli]

Nate Duehr wrote:
> Angelo Bertolli wrote:
>> Maybe I didn't understand if the problem is more complex than this, 
>> but I think zfs is the perfect tool for handling this kind of thing.  
>> Since this is a small thing for a developer area, you can set up a 
>> zfs file system in userspace under linux and not have to use 
>> Solaris.  ZFS can be set up to track changes to the file system.
>>
>> At work we are using Solaris/ZFS + rsync to make backups, and it 
>> works very nicely.
>>
>> Unfortunately Sun seems to have licensed ZFS open source, but 
>> specifically to be incompatible with the GPL so it's going to be a 
>> long time before you can use it on Linux without a performance hit.
>>
>>
>> http://en.wikipedia.org/wiki/ZFS
>>
>>
>>
>> Angelo
>
>
> Interesting, I originally thought of ZFS too, but I didn't realize the 
> Linux port was working 100% yet.  Is it?

I think it's working in userspace, but I admit we only use Solaris for 
ZFS because we can't take the performance hit.

> It's still just a "snapshot", not a fully "time journaled" filesystem, 
> and LVM2 could do snapshot type things also... but I like the ZFS 
> syntax and setup better, just a personal preference.  Neat stuff.

Yeah, I like zpools better anyway too.  I mean it's such an easier way 
to manage what is effectively a RAID5 or RAID6.

"ZFS is a transactional filesystem using copy-on-write semantics, 
guaranteeing an always-consistent on-disk state without the use of a 
traditional journal. However, it does also implement an intent log to 
provide better performance when synchronous writes are requested."

-- 
Angelo Bertolli
http://angelo.bitfreedom.com/

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