[nycbug-talk] off site backup

[alex at pilosoft.com]

On Sun, 30 Oct 2005, Jerry B. Altzman wrote:

> On 10/30/2005 2:46 PM, alex at pilosoft.com wrote:
> >>Given the engineering of drives, they *do* tend to like running all the
> >>time, or being off, but the torque to spin up from zero can be damaging.  
> >>(So can dropping it.)
> > rotating/seeking will eventually kill your motor/bearings.
> 
> ...after 200 kilohours, on average...
That really depends. Keep in mind, 10000 hours = 1 year. There are certain
drives that die after 10k hours, not 200k (75GXP, maxtor 6E series, etc). 
Unfortunately, only painful experience can teach you that certain drives 
are junk...

> In fact, we *did* do tape duplexing -- writing data to two drives
> simultaneously. (This would be something like RAIT 1, I suppose.)
> 
> >>>Keep in mind that media for tape (say, ~40$ for LTO 200G) is about
> >>>1/4 of cost of similar hard drive media.
> >>with transfer rates correspondingly lower :-)
> > Eh, I think it's close enough. LTO has 70MB/sec transfer rate. 7200
> > RPM drives have ~60MB/s, 10k rpm ~80MB/s
> 
> 15k rpm SCSI?
In that case, cost of media for tape is 1/10th of cost of 15k rpm scsi ;)

-alex