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Date:      Wed, 16 Sep 2020 21:03:25 +0100
From:      RW <rwmaillists@googlemail.com>
To:        freebsd-questions@freebsd.org
Subject:   Re: partitioning server with 2 hard drives
Message-ID:  <20200916210325.08868ecc@gumby.homeunix.com>
In-Reply-To: <20200916065432.508e19c3b9b5c0e44a72da3f@sohara.org>
References:  <MWHPR06MB32479D288A8D10AD73FC6A329A200@MWHPR06MB3247.namprd06.prod.outlook.com> <20200915231901.e767350415aad298732f72cc@sohara.org> <CAHu1Y70fkMavOh7Dfw5j9ifC1BwihoCxCua3ufauOtTqt=v_CQ@mail.gmail.com> <20200916065432.508e19c3b9b5c0e44a72da3f@sohara.org>

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On Wed, 16 Sep 2020 06:54:32 +0100
Steve O'Hara-Smith wrote:

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

> > 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.

Just out of curiosity, does ZFS leave a small amount of space unused on
a raw drive to allow for a replacement being very slightly smaller?  

 
> > 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.

In the early days of Fastmail they had a major outage where at least 3
drives failed. IIRC the other failures occurred while the RAID array was
being rebuilt after the first failure. The drives were identical in
every way, and I guess the the stress of a rebuild can play a part in
synchronising failures.



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