Date: Mon, 9 Dec 2013 16:06:36 +0000 From: krad <kraduk@gmail.com> To: =?ISO-8859-1?Q?Trond_Endrest=F8l?= <Trond.Endrestol@fagskolen.gjovik.no> Cc: FreeBSD stable <freebsd-stable@freebsd.org> Subject: Re: Does FreeBSD's ZFS reserve 1/64 of the capacity for COW? Message-ID: <CALfReydiZ%2BDbterrTs4x1Fb2LLB3BDqhbY3frcJ6RC2nKAnDHQ@mail.gmail.com> In-Reply-To: <alpine.BSF.2.00.1312061325420.75198@mail.fig.ol.no> References: <alpine.BSF.2.00.1312061325420.75198@mail.fig.ol.no>
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I wouldnt really worry about it as you shouldnt be planning to go over 80% capacity on a production pool anyhow, as at some point after that, and way before 100% you will start to get big slowdown on writes, which is more of an issue. On 6 December 2013 12:46, Trond Endrest=F8l < Trond.Endrestol@fagskolen.gjovik.no> wrote: > Hi, > > Today I came across "Becoming a ZFS Ninja Part 1" > http://www.youtube.com/watch?v=3DtPsV_8k-aVU featuring Ben Rockwood who > stated that ZFS reserves 1/64 of the capacity for COW safe-guarding. > Fast forward to 00:49:44. Thus, one should take this fact into account > when planning the storage capacity of your (larger) zpools. > > Does FreeBSD's ZFS also reserve 1/64 of the capacity for COW? > > If it's true, then I guess this should be noted in zpool(8) and in the > Handbook. > > Any comments or insights? > Do you think I should file a PR? > > Have a nice weekend! ;-) > > -- > +-------------------------------+------------------------------------+ > | Vennlig hilsen, | Best regards, | > | Trond Endrest=F8l, | Trond Endrest=F8l, = | > | IT-ansvarlig, | System administrator, | > | Fagskolen Innlandet, | Gj=F8vik Technical College, Norway, | > | tlf. mob. 952 62 567, | Cellular...: +47 952 62 567, | > | sentralbord 61 14 54 00. | Switchboard: +47 61 14 54 00. | > +-------------------------------+------------------------------------+ > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" >
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