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Date:      Mon, 13 Oct 2014 11:48:29 -0700
From:      Darren Pilgrim <list_freebsd@bluerosetech.com>
To:        karl@denninger.net
Cc:        freebsd-stable@freebsd.org
Subject:   Re: getting to 4K disk blocks in ZFS
Message-ID:  <543C1E7D.1000301@bluerosetech.com>
In-Reply-To: <20140911072351.GA50786@anubis.morrow.me.uk>
References:  <540FF3C4.6010305@ish.com.au> <54100258.2000505@freebsd.org> <5410F0B4.9040808@ish.com.au> <A0A549F7A4094F519A3660697AB4983F@multiplay.co.uk> <54114029.3060507@FreeBSD.org> <20140911072351.GA50786@anubis.morrow.me.uk>

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On 9/11/2014 12:23 AM, Ben Morrow wrote:
> Is there any way (short of building a new pool) to get a reasonable idea
> of how much extra space a given pool would use if converted?

Take the average file size modulo 4096, round it up to a multiple of 
512, subtract that from 4096, then multiply by the number of files in 
the data set.




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