Date: Sun, 11 Jul 2004 00:49:12 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: Steven Adams <steve@drifthost.com> Cc: freebsd-questions@freebsd.org Subject: Re: HDD Sizes reported wrong? Message-ID: <20040711054912.GB95931@dan.emsphone.com> In-Reply-To: <20040711053043.6DCBDFE9A@drifthost.com> References: <20040711053043.6DCBDFE9A@drifthost.com>
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In the last episode (Jul 11), Steven Adams said: > I have a LSI MegaRaid Raid card with 5x 36gig raid 5 scsi drives.. > > Now my /home is getting reported at 108gig(which is right) But for > some reason its saying 97gig free and 2.4 gig used.. > > Im confussed where the other 8.5gig or so is gone?? > > /dev/amrd0s1h 108G 2.4G 97G 2% /home First, I recommend not using the -h option when trying to total things up. You lose lots of precision. Second, the df values don't total up because 8% is reserved on ffs filesystems so the disk allocation algorithms stay efficient. You can lower it with tunefs but as the disk gets closer to 100%, performance rapidly degrades and files will get fragmented. Root can use that 8% which gives you the added benefit that if a user fills up a drive it doesn't keep root processes from working. http://www.freebsd.org/doc/en_US.ISO8859-1/books/faq/disks.html#DISK-MORE-THAN-FULL -- Dan Nelson dnelson@allantgroup.com
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