Bob Johnson <[EMAIL PROTECTED]> writes: > Message: 6 > Date: Thu, 28 Jul 2005 11:20:31 +0300 > From: Victor Semionov <[EMAIL PROTECTED]> > Subject: Re: defragmentation in FreeBSD 4.11 > To: freebsd-questions@freebsd.org > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset="windows-1251" > > > > > This is one of the things I find really hard to get Windows users to > > > understand. They just won't believe that a company like Microsoft would > > > still be using a filesystem that needs defragmenting if it were possible > > > to design one that didn't. I often wonder why myself - after all, they > > > must have put a fair amount of work into NTFS, which at least doesn't > > > seem to get corrupted in a power failure. Did they make a trade-off I > > > don't understand, or is it just incompetence - or worse, a deal with > > > disk manufacturers to sell more disk? > > > > Microsoft used to claim that NTFS doesn't need defragmentation. Compared to > MSDOSFS, that's a reasonably accurate statement, but if you push it hard > enough, it will still become fragmented. > > > Why is it unnecessary to defragment UFS? > > > > In normal use, files never become fragmented enough to affect performance. > In > a (loose) sense, files are intentionally fragmented in a controlled way so > that fragmentation doesn't cause problems. If you run fsck on a partition, > you will typically see fragmentation levels of less than one percent.
Careful, there; "fragmentation" on a UFS is measuring a completely different thing than the same term applied to a Microsoft filesystem. For UFS, it refers to non-contiguous free blocks (fragments, actually), as opposed to the Microsoft terminology, where it refers to non-contiguous blocks within the same file. Everything you are saying is correct, but it will confuse people who don't realize the difference. _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "[EMAIL PROTECTED]"
