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Re: kern/48378: LFS can't mount FS newfs_lfs created

The following reply was made to PR kern/48378; it has been noted by GNATS.

From: David Holland <>
Subject: Re: kern/48378: LFS can't mount FS newfs_lfs created
Date: Tue, 21 Oct 2014 16:18:16 +0000

 On Tue, 5 Aug 2014 at 09:40:53 +0200, Reinoud Zandijk wrote:
  >  Well yes, FFS does complain about the blocksize being bigger than 64k. Even
  >  though they share a bit of code, is the LFS implementation limiting our
  >  inability to handle 512k block sizes or is the format limiting us?
  >  diablo# newfs -b 512k /dev/rwd2a
  >  newfs: block size `512k' (524288) is greater than the maximum (65536).
  >  diablo#
 No. The problem is MAXPHYS. You can't mount a volume with block size
 greater than MAXPHYS, either in lfs or ffs or (for now at least) any
 other fs.
 Until the tls-maxphys branch gets merged, that means 64K max. After
 that, you will be able to use more on some devices.
 David A. Holland

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