Date: Wed, 9 Jul 2008 21:59:54 -0300 From: "Alexandre Biancalana" <biancalana@gmail.com> To: juri_mian@yahoo.com Cc: freebsd-fs@freebsd.org Subject: Re: 24 TB UFS2 reality check ? Message-ID: <8e10486b0807091759m7cf4a04dsa4538594bc4a9304@mail.gmail.com> In-Reply-To: <947384.22013.qm@web45601.mail.sp1.yahoo.com> References: <a969fbd10807081925o1ee3b70cn772ca48d3afb393@mail.gmail.com> <947384.22013.qm@web45601.mail.sp1.yahoo.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On 7/9/08, Juri Mianovich <juri_mian@yahoo.com> wrote: > > 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 ? I did be fewer nervous if you do 2 arrays of 11 disks... what`s the time that it will take to do a rebuild of a failed drive in your normal load ??
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?8e10486b0807091759m7cf4a04dsa4538594bc4a9304>