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). My tapes are
written every 2 - 6 weeks. 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).
Right now I have over 3 years on a set of LTO2 tapes with a 1% failure
rate. I figure I can get at least another year or two from them before
I need to replace them all.
cheers,
ski
--
"When we try to pick out anything by itself, we find it
connected to the entire universe" John Muir
Chris "Ski" Kacoroski, email@hidden, 206-501-9803
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