Dennis,
Great Post... and good info. The main reason our site is upgrading to
4.5 is ALSO because of this feature, so I am keeping our management
informed of this issue/problem.
Thanks,
Paul
>>> "Dennis Dwyer" <dfdwyer AT tecoenergy DOT com> 02/05/03 10:10AM >>>
OK ... At the risk of beating this beyond recognition, I went out to
the Veritas support web site and found several hits on this issue. I
found a Newsgroup article from Steve Staves titled "Another NBU 4.5
Calendar versus Frequency Question" from last August that, although
short, was very to the point. There were other hits as well to support
this but the bottom line is (my interpretation):
#1: If a backup window for a given policy is large (like 5 or 12 hours)
and the calendar based schedule crosses the midnight hour, you will
probably get at least two backup schedules submitted for the same policy
(that appears to be what's happening to us) because of the way NBU
tracks the days and judges the frequency of the last backup.
#2: According to multiple folks who have raised this question with
Veritas .... Veritas doesn't recognize this as a major problem. Their
solution (per Tech Note 248400) is to make the calendar based schedule
window a short period of time rather than a long period of time.
Preferably, just enough to start the policy. I have no idea how this
will affect failures and restarts or policies that have the entire
weekend as a window.
#3: I find it difficult to believe that ArcServeIT (what I consider a
lesser product to NBU DataCenter and the product I threw out to convert
to NBU) does calendar based schedule the way I would expect it to be
done and Veritas thinks their implementation is not a problem.
I guess we'll still tinker with it off and on but until Veritas decides
to address this (or at least publish in great detail how to implement it
so it works every time) we are probably going back to Frequency Based
Scheduling for the majority of our policies.
I hope the Veritas folks that review this group will take this item
back with you and realize the common perception of how Calendar Based
Scheduling should work (and does work in other products) is not even
close to what you've implemented in NBU 4.5. You either need to modify
NBU Calendar Based Scheduling so it works like the users think it will
work or ... dare I say it ... document how it does work so we will know
what to expect.
My thanks to Hampus Lind for his response that pretty much supports
what I've been able to find in the research.
Regards,
Dennis
Dennis F. Dwyer
Manager, Systems Software
Tampa Electric Company
(813) 225-5181 - Voice
(813) 275-3599 - FAX
Visit our corporate website at www.tecoenergy.com
The Colonel Says: "Time is not a test of the truth"
Translation: Just because you've always done it that way, doesn't make
it right
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