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Date:      Wed, 16 Sep 2020 06:54:32 +0100
From:      Steve O'Hara-Smith <steve@sohara.org>
To:        freebsd-questions@freebsd.org
Subject:   Re: partitioning server with 2 hard drives
Message-ID:  <20200916065432.508e19c3b9b5c0e44a72da3f@sohara.org>
In-Reply-To: <CAHu1Y70fkMavOh7Dfw5j9ifC1BwihoCxCua3ufauOtTqt=v_CQ@mail.gmail.com>
References:  <MWHPR06MB32479D288A8D10AD73FC6A329A200@MWHPR06MB3247.namprd06.prod.outlook.com> <20200915231901.e767350415aad298732f72cc@sohara.org> <CAHu1Y70fkMavOh7Dfw5j9ifC1BwihoCxCua3ufauOtTqt=v_CQ@mail.gmail.com>

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On Tue, 15 Sep 2020 16:10:05 -0700
Michael Sierchio <kudzu@tenebras.com> wrote:

> On Tue, Sep 15, 2020 at 3:19 PM Steve O'Hara-Smith <steve@sohara.org>
> wrote:
> 
> >
> >
> >         I would go for a ZFS mirror using the rest of the drives, set up
> > a weekly scrub and never worry about a drive failure again.
> >
> 
> When, not if, a drive fails, will you find one with precisely the same
> geometry / capacity to replace the failed drive and remirror?  Can you do

	You don't need to, you just need one big enough, and 1TB drives are
very easy to find.

> so before the other drive fails (which might be statistically likely)?

	Unless you do something daft like RMA the drive and wait then yes
IME.

> There are good online MMTDL, MTTF, MTBF numbers for various raid levels
> for ZFS. None would lead me to be so glib.

	Well OK there are no guarantees but a mirror is orders of magnitude
better than a single drive.

-- 
Steve O'Hara-Smith <steve@sohara.org>



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