Page 2 of 2 FirstFirst 12
Results 11 to 14 of 14

Thread: btrfs on openSUSE not releasing disk space

  1. #11
    Join Date
    Feb 2009
    Location
    Spain
    Posts
    25,547

    Default Re: btrfs on openSUSE not releasing disk space

    On 2012-12-27 02:26, ratzi wrote:
    > One of the systems I have is an old Pentium III PC,
    > on which openSUSE 12.1 installs fine from the DVD,
    > but which on the other hand won't boot from the 12.1 live CD !


    The live CD needs more memory.

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 11.4, with Evergreen, x86_64 "Celadon" (Minas Tirith))

  2. #12

    Default Re: btrfs on openSUSE not releasing disk space

    > I really like NTFS for data volumes because if its ability to compress
    > my huge datafiles (from computational fluid dynamics, etc.). With these
    > types of files, compression makes a huge difference on the number if
    > physical hard drives I have to maintain - big text files are massively
    > compressible - can make a 2TB HD effectively a 4TB HD. I think modern
    > data+metadata-storage files like NetCDF and HDF5 are also highly
    > compressible.


    That's only 50% (2:1) compression; are you sure you're only getting 4 TB
    data on a 2 TB drive? I typically get 10:1 compression with almost any
    text file of notable size, and that's with zip compression (vs. bzip2 or
    7z or something where I get even better rates). Anyway, I'm surprised
    that's all you get, but maybe that includes harder-to-compress things like
    images or other non-text data.

    > Hence my interest in BtrFS - at least for data volumes. Is Butterfs
    > really so unstable as to make NTFS preferable? I notice it's now in
    > 12.2 YaST as a seemingly viable option (12.1 x64 SATA3 Phenom x6 4GHz
    > 16GB). (BTW: I still keep "/" and "/home" as EXT4, just to be safe.)
    > I'm particularly concerned about reports that it doesn't free-up driveca
    > space intelligently...


    I've been using it as my primary volume on my primary box (laptop) for
    almost a year and so far it has been fine.

    The only concerns I'm aware of regarding disk space being freed up is
    around snapshot. The reason for this concern is that btrfs keeps
    snapshots which is a really awesome feature that comes from its
    copy-on-write (CoW) capabilities. What you should know, though, is that
    snapshots aren't taken every nanosecond or anything, so unless you
    manually snapshot the drive (or configure something to automatically do
    that for you regularly, or for certain predefined events), btrfs doesn't
    just take snapshots in order to have a good time. If you do not use them
    then its CoW capabilities are still available but disk space is freed as
    usual when you delete files.

    Good luck.

  3. #13
    Join Date
    Feb 2009
    Location
    Spain
    Posts
    25,547

    Default Re: btrfs on openSUSE not releasing disk space

    On 2012-12-27 14:34, ab wrote:
    >> I really like NTFS for data volumes because if its ability to compress
    >> my huge datafiles (from computational fluid dynamics, etc.). With these
    >> types of files, compression makes a huge difference on the number if
    >> physical hard drives I have to maintain - big text files are massively
    >> compressible - can make a 2TB HD effectively a 4TB HD. I think modern
    >> data+metadata-storage files like NetCDF and HDF5 are also highly
    >> compressible.

    >
    > That's only 50% (2:1) compression; are you sure you're only getting 4 TB
    > data on a 2 TB drive? I typically get 10:1 compression with almost any
    > text file of notable size, and that's with zip compression (vs. bzip2 or
    > 7z or something where I get even better rates). Anyway, I'm surprised
    > that's all you get, but maybe that includes harder-to-compress things like
    > images or other non-text data.


    He is talking of NTFS internal transparent compression, not compression
    by an utility like zip.

    And about btrfs, there is another thread here about compression not
    working as it should.

    --
    Cheers / Saludos,

    Carlos E. R.
    (from 11.4, with Evergreen, x86_64 "Celadon" (Minas Tirith))

  4. #14

    Default Re: btrfs on openSUSE not releasing disk space

    Btrfs (B-tree file system, variously pronounced "Butter F S", "Butterfuss", "Better F S",[4] or "B-tree F S"[5]) is a GPL-licensed experimental copy-on-write file system for Linux. Development began at Oracle Corporation in 2007. It is still in heavy development and marked as unstable. Especially when the filesystem becomes full, no-space conditions arise which might make it challenging to delete files.[6][7]
    Btrfs - Wikipedia, the free encyclopedia

Page 2 of 2 FirstFirst 12

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •