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Have also looked forward to this, it´s one of the major features that have been missing.
This together with Btrfs ability to change RAID levels, add new disks to an existing array on-the-fly and...

Are we really sure it is in ? I can´t see anything on the BTRFS devel mailinglist, and the latest GIT snapshot of the tool I downloaded 2 days ago
still misses support for RAID5/6.
I´m also eager...

And how will you cache if you don´t keep track the hot data ? Hot data tracking can be used both for caching and hot data migration.



The majority of Linux systems are not desktops. My personal...

You learn new stuff every day :) I played around with a Sun Unified Storage (horrible piece of crap by the way) about 3 years ago which had both a large L2ARC SSD and 2 x 18GB ZIL SSDs, since the ZIL...

I am using L2ARC for caching 2 RAID-Z devices in my ZFS box, and yes, read operations will benefit if they are in the cache. There are a couple of downsides as I see it:

* After a clean boot the...

No it doesn´t, the ARC keeps a copy of the hottest blocks, they also reside in their original location. A better solution would
migrate the blocks to faster/slower storage depending on usage...

I don´t think this is the same, ZFS has it´s ARC disks which keeps a copy of frequently accessed blocks, but the data also remains on your
slow spinning disks at the sae time. My understanding of...

Nice find, interesting figures. Seems like ZFS has the upper hand when using a larger number of drives, but I think we will se Btrfs closing this gap with new releases, there was a significant jump...

Believe it or not but it does happen, maybe because there is one thing Mr. Kebbaert hates more than Linux, and that is Microsoft which are much more hostile to open source than Sun and maybe even...

Kebabbert is as usual viciously defending everything Sun/Solaris.
Same story in the Swedish forums where he also hangs out, always claiming that he is not posting any FUD and always backing up his...