Why Not To Shout At Your Disk Array 125
Brendan Gregg of Sun's Fishworks lab has an interesting video demo up at YouTube demonstrating just how bad vibes, if expressed with sufficient volume in front of a rack full of disks, can cause a spike in disk latency. White noise, evidently, doesn't do them much harm. (Maybe they just feel awkward to get yelled at on camera.)
Why isn't this under idle? (Score:5, Informative)
It's been known for a long time vibrations are not good for discs (see notebooks). Even by early 90s music CDs had skip protection. If a disc skips, latency will of course momentarily increase. And with tolerances down even further, it's probably worse than back then.
In 10-15 years it won't matter anyway, almost everything will have SSD by then.
Re:JBODs? (Score:4, Informative)
A few reasons.
Re:JBODs? (Score:5, Informative)
Re:Secret Fact : Ultrasonic noise at low volumes ! (Score:5, Informative)
You don't know too many greybeards do you? I'm surprised that modern drives are susceptible to ultrasonic under 80 khz but real old drives and drums were known to have problems with low audible frequency harmonics. A simple solution to this problem is stamp a butterfly like pattern in the arm of the head. The same thing works for power lines (which is what the small dumbbell looking things are near the insulators)
Re:Secret Fact : Ultrasonic noise at low volumes ! (Score:4, Informative)
Informative? Seriously? I hope this is some metamod effort at providing Karma... but just in case someone does take this seriously, I should take out a patent on this. That way, when Monster sells their butterfly-patterned head arms for 20K to audiophiles who don't like the lack of warmth in SSDs, I can get in on the racket.