Michael Short schrieb:
> >> Disks can be spun down when not in use, and if you were only using them
> >> for backups and were concerned about power requirements then maybe that
> >> would be the thing to do.
> 
> I really don't think this is a valid argument, hard drives can have
> power management applied to them as well, without costly changers or
> human interaction. Hard drives are always available, and very reliable
> in the correct raid configuration. If something happens to the tape
> then the data is gone, with hard drives even with a bad hard drive a
> raid array can still function as a crippled raid array until you
> replace the malfunctioning drive.
> [...]

Last week we lost 4,5 TB of backup data due to a hardware failure that
was not detected by the raid controller. The error turned up with an
kernel panic and a filesystem crash, even then the controller showed
no error or problem, even the raid consistency check was ok...

Glady I use two different backup programs on two differnt hosts, so
it's no disaster. But I'm sure I won't trust a RAID to hold all my
backup data. The risk to lose all backup data is just too high. I'm
not sure if it's much better with disks that are changed in the same
way as tapes. 

Ralf

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