Date: Tue, 23 Sep 2014 08:51:25 -0700 (PDT) From: Beeblebrox <zaphod@berentweb.com> To: freebsd-questions@freebsd.org Subject: Re: Gpart: Adding mirror to existing zpool Message-ID: <20140923185109.4b9f2ff6@rsbsd.rsb> In-Reply-To: <alpine.BSF.2.11.1409230920450.71831@wonkity.com> References: <1411478977772-5951380.post@n5.nabble.com> <alpine.BSF.2.11.1409230920450.71831@wonkity.com>
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Hi, Warren.
Currently my partition setup (excluding ada0). 4k alligned as you can see:
=> 34 976773101 ada1 GPT (466G)
34 6 - free - (3.0K)
40 8388608 1 freebsd-swap (4.0G)
8388648 159383552 3 freebsd-zfs (76G)
167772200 809000928 2 freebsd-zfs (386G)
976773128 7 - free - (3.5K)
=> 40 1953525088 ada2 GPT (932G)
40 12582912 1 freebsd-swap (6.0G)
12582952 209715200 3 freebsd-zfs (100G)
222298152 1731226976 - free - (826G)
* ada1p3 and ada2p3 are the same pool as simple jbod (non-issue)
* ada2p2 is what I want to mirror on ada2p2
# gpart show -pr ada1 => 167772200 809000928 ada1p2 (386G)
809000928 - 167772200 = 641228728
# gpart add -a 4k -s 641228728 -i 2 ada2
# gpart show ada2 => 2 freebsd-zfs ada2p2 (376G) = 10G less than ada1p2
-----
FreeBSD-11-current_amd64_root-on-zfs_RadeonKMS
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Date: Tue, 23 Sep 2014 12:14:44 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Beeblebrox <zaphod@berentweb.com>
Subject: Re: Gpart: Adding mirror to existing zpool
In-Reply-To: <20140923185109.4b9f2ff6@rsbsd.rsb>
Message-ID: <alpine.BSF.2.11.1409231208170.20207@wonkity.com>
References: <1411478977772-5951380.post@n5.nabble.com>
<alpine.BSF.2.11.1409230920450.71831@wonkity.com>
<20140923185109.4b9f2ff6@rsbsd.rsb>
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On Tue, 23 Sep 2014, Beeblebrox wrote:
> Hi, Warren.
>
> Currently my partition setup (excluding ada0). 4k alligned as you can see:
> => 34 976773101 ada1 GPT (466G)
> 34 6 - free - (3.0K)
> 40 8388608 1 freebsd-swap (4.0G)
> 8388648 159383552 3 freebsd-zfs (76G)
> 167772200 809000928 2 freebsd-zfs (386G)
> 976773128 7 - free - (3.5K)
> => 40 1953525088 ada2 GPT (932G)
> 40 12582912 1 freebsd-swap (6.0G)
> 12582952 209715200 3 freebsd-zfs (100G)
> 222298152 1731226976 - free - (826G)
>
> * ada1p3 and ada2p3 are the same pool as simple jbod (non-issue)
> * ada2p2 is what I want to mirror on ada2p2
> # gpart show -pr ada1 => 167772200 809000928 ada1p2 (386G)
> 809000928 - 167772200 = 641228728
> # gpart add -a 4k -s 641228728 -i 2 ada2
> # gpart show ada2 => 2 freebsd-zfs ada2p2 (376G) = 10G less than ada1p2
The first column is the starting block, the second column is the size,
so it is not necessary to do the math. Just create a partition the same
size in the free space on ada2. It does not need to start at the same
location as the other partition on ada1, but it should be aligned to 4K
for performance:
gpart add -t freebsd-zfs -a4k -s 159383552 -i2 ada2
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