24 TB UFS2 reality check ?

[Juri Mianovich]

Hello Jeff,

--- On Tue, 7/8/08, Jeff Mohler <speedtoys.racing at 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.