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Date:      Tue, 2 Jan 2018 10:40:24 -0800
From:      pete wright <nomadlogic@gmail.com>
To:        freebsd-questions <questions@freebsd.org>
Subject:   zpool fragmentation
Message-ID:  <CAGBmCT6tjinhjQrzs08zVUoK6OzUB1HzovN=cOmAWOfNzrRPsA@mail.gmail.com>

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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?
2) if it is bad, are there any coping mechanisms people use to reduce
fragmentation?

Cheers!
-pete

-- 
pete wright
www.nycbug.org
@nomadlogicLA



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