On Sat, Oct 16, 2010 at 12:07:04PM +0200, Seth Mos wrote: > There are arguments back and forth about the use of notebook drives 24x7.
While running hot. Under vibration load. > They are designed to withstand shocks, most of the time the disk head is > parked instead of flying over the platter. They're not made to withstand vibration, under elevated temperatures while in 24/7/365 operation. Oh, and if they park down all the time, they will exhaust their (limited) number of restarts in no time at all (not specific to notebook drives, see e.g WD 'green' drive failure). > The also perform admirably without ventilation, I havn't seen a notebook with > proper ventilation years. > > I think that all things considered the argument is moot. While the plural of anecdote is not data, I've had two notebook drives (different manufacturers) die at the colo within ~6 months. Judging from your argumentation, I don't think you can 'moot' anything yet. > Everything fails at some points, even "enterprise" quality gear that costs a > decent sized car. Enterprise drives (which start at about 200 EUR) are designed to operate under vibration load for about 2-4x of consumer MTBF, while producing a minimal error rate. > Fanless though, those things likely fail, you can buy a expensive consumer > product fan but that will most likely still fail. Again, I can't follow the leaps of logic in your argumentation. Enterprise fans, especially axial ones, last effectively forever. And they're redudant, have monitoring via IPMI and can be typically hot-plugged. If you buy cheap crap which operates at high rpm, especially sitting in a cold spot, it will fail within a year. > I've used Pabst fans before and never ever seen one fail. Then again they > cost a lot more as well. I believe a single 12cm is about 35 euros. Again, consumer lines (Pabst are no longer the gold standard even in consumer product lines). > I've recently built a Lanner Inc. FW7535 that will most likely outlast me. > It's a dual core atom with 6 gig ports and runs from a 4GB Sandisk extreme 3 > flash. I've loaded the full install on it instead of the nanonbsd version for > my own reasons. > > It's silent, rugged, fast and it works really well. It's about 500 euros ex > VAT though. It is proper industrial quality built. It looks like a nice unit, for the price, and comes with Intel NICs. However, passively cooled systems are a no-go if confined in a rack, as they provide no airflow by themselves. Sometimes, even relatively poorly ventilated systems like the Supermicro Atoms can counterintuitively provide better cooling if mounted back to back in large numbers, so air convection is enhanced due to funnel effect (assuming the units blow front to back, and the inner channel allows unobstructed venting to the top). > > Regards, -- Eugen* Leitl <a href="http://leitl.org";>leitl</a> http://leitl.org ______________________________________________________________ ICBM: 48.07100, 11.36820 http://www.ativel.com http://postbiota.org 8B29F6BE: 099D 78BA 2FD3 B014 B08A 7779 75B0 2443 8B29 F6BE --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected] Commercial support available - https://portal.pfsense.org
