DAT and 8mm: practical experiences
Robert den Hartog
rden at rden.gen.nz
Sat Jun 29 13:29:23 AEST 1991
In article <1991Jun17.024733.3999 at cs.cmu.edu> cbs at cs.cmu.edu (Clauss Strauch) writes:
>
> I've seen the hype and some of the technical data comparing 8mm to
>4mm tape drives, but would like to hear people's practical experiences with
>the two media. Specifically:
> -- Experiences with reliablity, both for the drives and
> the media (how well do the tapes hold up to repeated
> use/abuse?).
[...]
> -- Anything else that gets left out of the advertising
> blurbs and technical specifications, but might cause a
> sysadmin to prefer one technology over the other.
>
We have 1 exabyte unit away for head replacement after just under 2 years
service. Usage is about 3 hours/day for 5 days/week. (1 daily backup
with verify.)
We asked our supplier if 2 years was reasonable, apparently they got the
word back from Exabyte that 2-3 years is all that's expected from the heads.
(I can't fully guarantee the authenticity of that quote.) Apprently longer
life heads are being investigated.
But new heads every 2 1/2 years is not cheap, nor very settling. (Apparently
when the unit comes back it may have trouble reading/writing tapes recently
created before the unit went away.) If you're unit needs cleaning often,
start saving (or check your maintenance agreement.)
The repair is a 1 month, 1 week or 2 day turnaround depending on how much
you eant to pay.
Any info on DAT head life?
As to tapes, the usual: avoid sunlight and heat. One supplier even told us
to only buy tapes in winter (in case they sit in the delivery truck for too
long on a hot summer day.)
--
The spelling mistakes aren't mine, they're the computers.
Hey, have a nice one.
Robert den Hartog. {rden|robert}@{rden|mercury}.gen.nz
Sorry, just me again, I seem to have lost my EOF somewhere. Aha, there it is
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