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On 03/17/2016 04:16 AM, Andrei Borzenkov wrote:
On Wed, Mar 16, 2016 at 5:20 PM, Anton Aylward <opensuse@antonaylward.com> wrote:
On 03/16/2016 09:04 AM, Andrei Borzenkov wrote:
On Wed, Mar 16, 2016 at 3:55 PM, Anton Aylward <opensuse@antonaylward.com> wrote:
> > That's the whole point: with BtrFS there is *no* partitioning, its all > one file system. There are no boundaries.
There are, on subvolume granularity.
Could you explain that and illustrate it please.
It is illustrated by default openSUSE install and explained many times in this thread.
Perhaps we mean different things by 'granularity". When I mkfs a file system I can set the block size. I can set other things depending on the file system Linda did a very good illustration of this for XFS, how the block size and make best use of the partition, waste the least amount of space. Different types of file can profit from different block sizes or extents. I thin Linda made this point talking of how videos are stored differently from the kind of files you'll find in {/usr,}/bin and {/usr,}/lib. But when you mkfs a BtrFS its homogeneous. You've made the point, I've made the point,, others have made the point, that the files under a subvolume are all made up of blocks from the same "pool", that is the same - as I use the term - 'granularity'. Perhaps its more than a difference in use of terms, but if so I need a better explanation of how to set up subvolumes. There's a second point here. Altering block sizes at mkfs is a "bleedin' obvious" technique we've had for years, and its there in the YAST style mkfs as well. I'm an experienced BtrFS user, as I've mentioned, I've played with it since it came out on 13.1; I've tried it on file systems for music, photos and videos as well as the RootFS. I've tried it with subvolumes, tweaked subvolumes and without. There's a lot that can be tweaked with BtrFS, much more than other file systems https://btrfs.wiki.kernel.org/index.php/Mount_options Perhaps this is all overwhelming for anyone less than a dedicated sysadmin, dedicated not just in the role but in the willingness to experiment with 'all that" and learn the applicability and benefits. I don't claim to have explored the *all*, but I do, as I've said, tried them against XFS, ReisersFS, Nil2FS. I kinda like XFS ... Thank you Linda. Originally I liked BtrFS, I saw it as whet we might have instead of Reiser4; a couple of years on I'm disappointed. -- A: Yes. > Q: Are you sure? >> A: Because it reverses the logical flow of conversation. >>> Q: Why is top posting frowned upon? -- To unsubscribe, e-mail: opensuse+unsubscribe@opensuse.org To contact the owner, e-mail: opensuse+owner@opensuse.org