Date: Tue, 2 Jan 2018 10:16:57 -1000 From: Kent Kuriyama <kent.kuriyama@gmail.com> To: Adam Vande More <amvandemore@gmail.com> Cc: pete wright <nomadlogic@gmail.com>, freebsd-questions <questions@freebsd.org> Subject: Re: zpool fragmentation Message-ID: <CACArijD75=mVsfbRNrKz4dmgKWjTjPPKtK=H-nqBdNJ0GW7iuQ@mail.gmail.com> In-Reply-To: <CA%2BtpaK0r=DAOi5pA%2BYHC4u7C12EjRc6sUE1tdQJU-EW5YWFVqw@mail.gmail.com> References: <CAGBmCT6tjinhjQrzs08zVUoK6OzUB1HzovN=cOmAWOfNzrRPsA@mail.gmail.com> <CA%2BtpaK0r=DAOi5pA%2BYHC4u7C12EjRc6sUE1tdQJU-EW5YWFVqw@mail.gmail.com>
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This article explains the meaning of that column. https://utcc.utoronto.ca/~cks/space/blog/solaris/ZFSZpoolFragmentationMeaning On Tue, Jan 2, 2018 at 9:52 AM, Adam Vande More <amvandemore@gmail.com> wrote: > On Tue, Jan 2, 2018 at 12:40 PM, pete wright <nomadlogic@gmail.com> wrote: > > > Hi there, > > I was wondering how others here on the list deal with zpool > > fragmentation. My general purpose laptop uses zroot, and I've noticed > > over time fragmentation of my pool has grown to %42: > > > > $ zpool list > > NAME SIZE ALLOC FREE EXPANDSZ FRAG CAP DEDUP HEALTH > ALTROOT > > zroot 230G 87.3G 143G - 42% 37% 1.00x ONLINE - > > $ > > > > I guess I have two questions: > > 1) is fragmentation generally bad, or just a fact of life for a system > > with lots of churn? > > > > Yes but impact also depends on pool config. > > > > 2) if it is bad, are there any coping mechanisms people use to reduce > > fragmentation? > > > > Keep lots of free space. > > -- > Adam > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions- > unsubscribe@freebsd.org" > -- Kent, kent.kuriyama@gmail.com
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