Date: Wed, 9 Jul 2008 12:13:04 -0700 (PDT) From: Juri Mianovich <juri_mian@yahoo.com> To: Jeff Mohler <speedtoys.racing@gmail.com> Cc: freebsd-fs@freebsd.org Subject: Re: 24 TB UFS2 reality check ? Message-ID: <947384.22013.qm@web45601.mail.sp1.yahoo.com> In-Reply-To: <a969fbd10807081925o1ee3b70cn772ca48d3afb393@mail.gmail.com>
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Hello Jeff,
--- On Tue, 7/8/08, Jeff Mohler <speedtoys.racing@gmail.com> wrote:
> One drive has a what..maybe a 1 per 1.0 E15 bits transferred
> uBER, and
> you have 24x that of one drive, as each drive it it's
> statistical crap
> shoot. Each drive may NEVER hit uBER for you, but one may
> do it
> tomorrow.
>
> Plus, you have commodity firmware levels on those drives
> and commodity
> BER mechanisms, so you COULD argue you have another 2x
> liability WRT
> losing it all without HEFTY raid, at least 5+1.
Thank you - I understand. You are worried because of the lack of redundancy.
I didn't want to make my questions any more complicated than they were, but since we are on the topic, I will tell you that _in reality_ I will not make a 24 TB array, I will in fact use the raid-6 functionality (two parity drives) of my card and make a ~22 TB array.
Does that address the concerns you were raising ? Does 22 data and 2 parity (raid 6) still make you very nervous, or does that completely change the scenario you were worried about ?
Thanks.
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