touch-packages team mailing list archive

[Theodore Ts'o <tytso@xxxxxxx>]

If you try to use more than 95% of the storage, performance will
generally suffer -- badly.   Now, you may not care for certain use
cases; if you are doing backups, you might not worry about that much
about performance, and you might care a lot more about using the last
few bytes of the disk.   But changing this default is not something I
plan to do upstream.

In addition for the root file system, you really do want to leave the
default at 5% so that root can write to critical file systems.  And
since the vast majority of Ubuntu users are using a single root file
system, that implies that the for the vast majority of file systems
created by Ubuntu, the default is in fact appropriate.

-- 
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https://bugs.launchpad.net/bugs/1340448

Title:
  5% reservation for root is inappropriate for large disks/arrays

Status in “e2fsprogs” package in Ubuntu:
  Confirmed

Bug description:
  mke2fs (and it's ext3 and ext4 analogs) still default to reserving 5%
  of the filesystem for root.  With the size of modern disks and arrays
  this isn't a terribly sensible default, e.g. if I have a 10Tb array,
  mke2fs will reserve 500Gb for root.

  Obviously this is both tunable at FS creation time and fixable after
  the fact but I still think we should try and improve the defaults.

  Given the size of modern disks, I think it'd make sense to either a)
  only reserve a smaller amount (e.g. 1%) or b) reserve n% if the
  filesystem is << NNN GB and otherwise reserve NN GB.

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