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The nice feller over at phoronix brings us this handy to have bit of info:
It turns out the RAID5 and RAID6 code for the Btrfs file-system's built-in RAID support is faulty and users should not be making use of it if you care about your data.
There has been this mailing list thread since the end of July about Btrfs scrub recalculating the wrong parity in RAID5. The wrong parity and unrecoverable errors has been confirmed by multiple parties. The Btrfs RAID 5/6 code has been called as much as fatally flawed -- "more or less fatally flawed, and a full scrap and rewrite to an entirely different raid56 mode on-disk format may be necessary to fix it. And what's even clearer is that people /really/ shouldn't be using raid56 mode for anything but testing with throw-away data, at this point. Anything else is simply irresponsible."
Just as well I haven't gotten around to trying it then.
(Score: 4, Interesting) by NCommander on Sunday August 07 2016, @05:15PM
Sun's management was famously clueless. I've liked how the (in)famous USENIX talk on the subject, https://www.youtube.com/watch?v=-zRN7XLCRhc [youtube.com] which had a rather epic rant on the subject, describing the situation akin to Somalia warlords.
That being said, I miss Sun. I rather deal with incompetence vs. malice, and that's about the best way I can describe Oracle's practices. At leas Sun both gave back, defined open standards, and from a technical standpoint, pretty damn decent.
Still always moving
(Score: 3, Interesting) by Post-Nihilist on Sunday August 07 2016, @07:01PM
Sun's management was well past the cluelessness point, they were deep into the Kafka zone. When I got bored by that chearleading job, I did a small experiment: Instead of quitting I kept submitting reports on how i spent my time fillings the report requested by the other managers, naively thinking that they would catch on the silliness of the situation. I was so naive...all I managed to achieve is getting some praise for my accurate record keeping, at which point I formally resigned.
Be like us, be different, be a nihilist!!!
(Score: 3, Insightful) by fleg on Monday August 08 2016, @04:13AM
>Sun's management was famously clueless.
i was there in the late 80's/early 90's in the uk, they were fine up until around the time they merged their uk and european headquarters into one building, suddenly there were managers everywhere and it went downhill fast in terms of culture. it was also around that time they unbundled the c compiler from the OS, which a lot of the old hands were very unhappy about. i think the writing was on the wall from that point.
(Score: 2) by Post-Nihilist on Monday August 08 2016, @04:43AM
Let's have a drink to a decade of driftings managers
Be like us, be different, be a nihilist!!!
(Score: 2) by fleg on Monday August 08 2016, @05:29AM
mines a large single malt!
does the underbelly of your ivory tower have a bar?