I'm researching options for improving the backup scheme for our
Xsan. At 7TB, we're just at the limit of what is practical with a
firewire-based DDT scheme and want to move to a fully tape-based
scheme. Does anyone have a good rule of thumb for how many backup
cycles you can put LTO-3 tapes through before replacing them?
Thanks,
Dan,
I typically replace all tapes in a batch when I start getting
significant errors (e.g. 5% of the tapes start to fail).
Well you really need to define "fail". You can pretty much always
expect errors of some sort on any given tape. I've yet to see *any*
tape without some sort of errors in 30 years of dealing with them.
My tapes are written every 2 - 6 weeks.
Then aging may be more important than errors.
For me anyway, I have found that the LTO tapes always fail on
write, not read so I have never ended up with a tape that I cannot
restore from (perhaps I have just been lucky here).
Ummm... something fundemantally flawed about that statement. If the
wrote fails then the read, even if successfull, is bad.
Right now I have over 3 years on a set of LTO2 tapes with a 1% failure rate.
Again, define "failure".
--
-dhan
------------------------------------------------------------------------
Dan Shoop AIM: iWiring
Systems & Networks Architect http://www.ustsvs.com/
email@hidden http://www.iwiring.net/
1-714-363-1174
"The wise man doesn't give the right answers, he poses the right
questions." -- Claude Levi-Strauss
iWiring provides systems and networks support for Mac OS X, unix, and
Open Source application technologies at affordable rates.
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