Date: Sun, 9 Aug 2009 09:43:00 +0100 From: chris scott <kraduk@googlemail.com> To: "John ." <comp.john@googlemail.com> Cc: freebsd-questions@freebsd.org Subject: Re: a (hopefully) simple newbie zfs query regarding available space Message-ID: <d36406630908090143t5a5023a4j4ac2df37b0782fd7@mail.gmail.com> In-Reply-To: <abc784790908090039j2c7bbc6bsdebf7a2d8faf96c3@mail.gmail.com> References: <abc784790908090039j2c7bbc6bsdebf7a2d8faf96c3@mail.gmail.com>
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2009/8/9 John . <comp.john@googlemail.com> > Hello list > > I followed instructions for ZFS on > http://wiki.freebsd.org/ZFSQuickStartGuide, substituting ad6 and ad10 > (two new SATA3 1TB disks) for da0 da1 and da2 in the instructions. I > was surprised to see only 993GB in /tank/. Is this expected, or is it > user error? Also, these disks are completely unformatted. I expected > to do a newfs or something similar, and for it to take a bit of time! > > This is on a running 7.2-STABLE amd64 system. It is only these two > disks that I want as ZFS, the rest are UFS2 > > cheers > -- > John > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to " > freebsd-questions-unsubscribe@freebsd.org" > not a zfs thing is happens with all os and file systems. Basically HD manufacturers quote their capacities in base 10 ie 1 TB = 1000000000 bytes. File systems are calculated in binary therefore the calculation they use is 1024 x 1024 x 1024 = 1099511627776. Slightly more as you can see. Therefore 1 GB is os terms is 1073741824 therefore hd capacity in GB is 1000000000000/1073741824 = 931.322575 The extra you see is it due to HD manufactures slightly over capacity the drives
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