[Asterisk-Users] UPS for Asterisk

[Scott Laird]

On Jan 23, 2005, at 7:30 PM, Nick Bachmann wrote:
>> > As I understand, if HD activity is minimal, the probability of HD
>> > failure is significantly reduced.
>>
>>
>>  HDDs don't fail because they lose power.
>
> Unless the heads crash, which can happen if power fails. I know HDD 
> manufacturers have done "head unloading" and such recently, but the 
> risk is still higher if power is suddenly lost during a write.

And, in fact, some drives *do* have problems with sudden outages.  Some 
recent IBM drives will interpret sectors that were only partially 
written when the power failed as bad blocks and refuse to read or write 
to them when the power comes back on.  I wouldn't be surprised if other 
drives have similar problems.  FWIW, we have a drive in a test system 
at work that started developing problems immediately after a power 
outage a couple months ago.  It might be just a coincidence, but the 
timing was right--the power went out in the afternoon, and the evening 
SMART media check found bad sectors.


Scott