17 messages in org.freebsd.freebsd-fs24 TB UFS2 reality check ?| From | Sent On | Attachments |
|---|---|---|
| Juri Mianovich | Jul 8, 2008 7:56 pm | |
| Julian Elischer | Jul 8, 2008 8:01 pm | |
| Juri Mianovich | Jul 8, 2008 8:59 pm | |
| Julian Elischer | Jul 8, 2008 9:12 pm | |
| Bakul Shah | Jul 8, 2008 9:26 pm | |
| Bakul Shah | Jul 8, 2008 9:31 pm | |
| Julian Elischer | Jul 8, 2008 9:44 pm | |
| Juri Mianovich | Jul 8, 2008 9:44 pm | |
| Jeff Mohler | Jul 8, 2008 10:03 pm | |
| Jeff Mohler | Jul 9, 2008 2:25 am | |
| Juri Mianovich | Jul 9, 2008 2:27 am | |
| Juri Mianovich | Jul 9, 2008 7:41 pm | |
| Jeff Mohler | Jul 10, 2008 1:02 am | |
| Alexandre Biancalana | Jul 10, 2008 1:28 am | |
| Juri Mianovich | Jul 10, 2008 4:12 pm | |
| Gary Palmer | Jul 10, 2008 5:25 pm | |
| Jeff Mohler | Jul 10, 2008 5:38 pm |
| Subject: | 24 TB UFS2 reality check ? | |
|---|---|---|
| From: | Juri Mianovich (juri...@yahoo.com) | |
| Date: | Jul 9, 2008 7:41:14 pm | |
| List: | org.freebsd.freebsd-fs | |
Hello Jeff,
--- On Tue, 7/8/08, Jeff Mohler <spee...@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.