Date: Thu, 7 Jun 2007 17:04:09 +0200 From: "Richard Noorlandt" <lists.freebsd@gmail.com> To: freebsd-fs@freebsd.org Subject: tunefs question Message-ID: <99c92b5f0706070804p42da0881kfc866b192be60ed5@mail.gmail.com>
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Hi everybody, While reading a bit about tunefs I noticed that UFS reserves 8% of the drive space for the root user and the system. However, I don't really understand what this space is actually used for. From the tunefs man page I understand that it is primarily used to guard against fragmentation, and that's about it. Is this the only thing that the reserved space is used for? I'm building a large array for my fileserver, and it actually hurts a bit to see that so much space is "wasted" without a very clear reason to do so. Especially because the data on the array won't be modified very often, it appears to be quite a lot of disk space just to prevent fragmentation. Does anybody have some more information on this? And while I'm at it: what is the effect of the expected average file size option? What are the benefits and dangers of tweaking it? From the FreeBSD handbook I understand that the FS actually optimizes itself as time passes, but that's about all that's said about it. Regards, Richard
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