On Fri, Apr 6, 2012 at 4:17 PM, Olivier Schwander < [email protected]> wrote:
> Nice work on the vg2. > > Le 06 Apr 2012 07:58, Shawn Willden a écrit: > > we currently have just over 9 TB available storage space, right around > > 6 TB used, and we're uploading 140 GB per day. > > I'm a bit curious: what are the common use cases for this ? It should be > interesting to have some statistics/examples/success story on the > website. > I think most of us are using it for backup. That was my goal when I started "encouraging" (cajoling?) the early members to establish high uptime, high capacity and wide node distribution requirements -- to create a virtually indestructible Internet-based backup solution. > > Next goal: 32 nodes highly-reliable nodes. > > What are the advice or requirements to reach your 95% uptime goal ? I > guess the hardware is not really a problem but the connection must > matter a lot. Are you using ADSL, optic fiber, high-end connection in a > datacenter ? I don't have any idea of the availability a home ISP may > provide. 95% really isn't that high. Over the course of a year, for example, you can have over 18 days of downtime and still reach 95%. That's 36 hours of downtime per month. In practice, most of our nodes exceed the availability requirements by a large margin, even though many of them are on home ADSL or cable modem connections. If your home ISP service were down a day and a half every month, you'd change ISPs. Well, I would, anyway. The uptime requirement is really more of a question of attitude. We want members of the grid to go into it with the attitude that they have a responsibility to keep their nodes up and running 100% of the time. The stated 95% goal is really just an admission that we understand perfection is impossible. It also provides a baseline we can use for statistical calculations used to estimate failure probabilities and derive reasonable erasure-coding parameters. -- Shawn
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