[nycbug-talk] off site backup
Jerry B. Altzman
jbaltz at 3phasecomputing.com
Sun Oct 30 14:27:52 EST 2005
On 10/30/2005 1:53 PM, alex at pilosoft.com wrote:
> Disk drives fail in different ways. It is uncommon for drive not to spin
> up after 1-2 years of shelf life - it is the *power on hours* that usually
> kill you. Yes, there are certain failure modes that result in drive being
> completely inaccessible - motor burning out, failing bearings, broken head
> - but those are fixable (at about 1000$ cost) by a competent guy with a
> donor drive, a soldering gun and a screwdriver. ;)
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.)
> Keep in mind that usually, with hard drives, it isn't hard to implement a
> RAID system where failure of one drive doesn't impact your entire system -
> much harder than tape, as you need >1 tape drive to make it happen.
Multi-tape-drive jukeboxes mitigate this nicely.
> 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 :-)
> So, its really apples and oranges. For historic (say, you have to do once
> a week backup and store it offsite, with retention of 1 year) - it doesn't
> make sense to do hard drives. For near-line and on-line, you want to use
> hard drives.
Hard drives are the way to go if you have a time-to-recovery on the
order of minutes instead of hours (or hours instead of days).
With recordable DVD media being relatively cheap, is anyone archiving to
jerry b. altzman jbaltz at 3phasecomputing.com +1 718 763 7405
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