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Date:      Sun, 27 Jan 2002 17:06:20 -0800
From:      Terry Lambert <tlambert2@mindspring.com>
To:        "Gary W. Swearingen" <swear@blarg.net>, freebsd-chat@FreeBSD.ORG
Subject:   Re: Bad disk partitioning policies (was: "Re: FreeBSD Intaller (was     "Re: ... RedHat ...")")
Message-ID:  <3C54A40C.51FBB00A@mindspring.com>
References:  <20020123124025.A60889@HAL9000.wox.org> <3C4F5BEE.294FDCF5@mindspring.com> <20020123223104.SM01952@there> <p0510122eb875d9456cf4@[10.0.1.3]> <15440.35155.637495.417404@guru.mired.org> <p0510123fb876493753e0@[10.0.1.3]> <15440.53202.747536.126815@guru.mired.org> <p05101242b876db6cd5d7@[10.0.1.3]> <15441.17382.77737.291074@guru.mired.org> <p05101245b8771d04e19b@[10.0.1.3]> <20020125212742.C75216@over-yonder.net> <p05101203b8788a930767@[10.0.1.14]> <gc1ygc7sfi.ygc@localhost.localdomain> <3C534C4A.35673769@mindspring.com> <0s3d0s5dos.d0s@localhost.localdomain> <3C53ED01.61407A02@mindspring.com> <ffbsffnwfp.sff@localhost.localdomain> <3C54A24B.B0B607F@mindspring.com>

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Terry Lambert wrote:
> > If I understand this correctly (a bad assumption), the peformance at
> > 95% full is the same regardless of whether I reserve 10% or 1%.
> 
> Yes.

Let me add a caveat:  *absolute percentage*.

The "percentage full" that "df" reports is "percentage of
the available disk space, not including the free reserve".

The performance is based on "percentage of total real disk
space".  You have to post-process the "df" output, if you
want to see this number, since it's not normally reported,
because people are assumed to have made informed decisions
about free reserve in the first place, so any amount of
fill up to the "df" reported space is considered the be in
the range of "acceptable to the user performance".

-- Terry

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