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Comment: Re:Advatages of ZFS over BTRFS? (Score 1) 297

by johanwanderer (#44885965) Attached to: OpenZFS Project Launches, Uniting ZFS Developers
I recently had a bunch of BTRFS failure on disks with heavy traffic. It's terrifying when you have to reboot any of those servers.

The only saving grace was the cluster was able to tolerate multiple block device failures, so I was able to reformat those disks using ZFS and resync the data.

To sum up, I experimented on an experimental file system, got burnt, and then switched back to ZFS. I didn't lose data, just time and frustrations.

Comment: Re:Clinical records are hard (Score 1) 220

by johanwanderer (#44885761) Attached to: Abandoned UK National Health Service IT System Has Cost $16bn... So Far
Another use of the paper record is when they need to re-input all that into the new systems they upgrade to.

It sounds like a joke, but it's not. Happens all the time. These office systems are so obscure that the new vendors often time don't even bother to migrate the data, forcing manual data entry for all the relevant records. It's very sad.

It's the same when these "office" systems have thousands of connected offices. Each would still have to re-enter its records.

Comment: Re:Mod parent up (Score 1) 181

by johanwanderer (#44310485) Attached to: New Thermocell Could Turn 'Waste Heat' Into Electricity
Let's supposed your "final" exit temperature is 90C. Also let's assume the cooling reservoir is around 10C. Let's also assume that the final stage takes steam from 200C down to 90C. That give it a theoretical Carnot limit of 110/363 ~ 30%.

From the article, "The device offers the possibility of a cheap and flexible design suitable for harvesting waste heat in the 100- to 200-degrees Celsius range.". Assume it really work all the way to 10C, that could theoretically be 190/283 ~ 67%. If their efficiency is higher than a turbine, then they can use that to replace the last turbine stage. If not, then there is nothing to see.

I think the news here is that they *might* have come up with a better device than a low temperature turbine.

Mathematics deals exclusively with the relations of concepts to each other without consideration of their relation to experience. -- Albert Einstein

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