xfs mount/create options (was: XFS status update for August 2010)

[Michael Monnerie]

I just found that my questions from Monday were not solved, but this is 
interesting, so I want to warm it up again.

On Montag, 6. September 2010 Michael Monnerie wrote:
 I looked into man mkfs now, which brings up these questions:
 
 On Sonntag, 5. September 2010 Dave Chinner wrote:
 >         - relatime,logbufs=8,attr=2,barrier are all defaults.
 
 Why isn't logbsize=256k default, when it's suggested most of the time
 anyway? On machines with 32MiB or more 32k is the default, but most
 machines these days have multi-gigabytes of RAM, so at least for
 RAM>1GiB that could be made default.
 
 >         - largeio only affects stat(2) output if you have
 >           sunit/swidth set - unlikely on a laptop drive, and has
 >           no effect on unlink performance.
 >         - swalloc only affects allocation if sunit/swidth are set
 >           and has no effect on unlink performance.
 
 Hm, it seems I don't understand that. I tried now on different
  servers, using
 stat -f /disks/db --format '%s %S'
 4096 4096
 
 That filesystems were all created with su=64k,swidth=(values 4-8
 depending on RAID). So I retried specifying directly in the mount
 options: sunit=128,swidth=512
 and it still reports "4096" for %s - or is %s not the value I should
 look for? Some of the filesystems even have allocsize= specified,
  still always 4096 is given back. Where is my problem?
 
 And while I am at it: Why does "mount" not provide the su=/sw=
  options that we can use to create a filesystem? Would make life
  easier, as it's much easier to read su=64k,sw=7 than
  sunit=128,swidth=896.
 
 When I defined su/sw on mkfs, is it enough, or would I always have to
 specify sunit/swidth with every mount too?
 



-- 
mit freundlichen Grüssen,
Michael Monnerie, Ing. BSc

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