Keywords: DataAccWG
Hi all,
I published in Docushare the updated version of the spreadsheet
with database storage estimates (disk and deep storage).
As far as I know it reflects all that was discussed recently,
including at today's DataAccWG telecon.
The url:
https://www.lsstcorp.org/docushare/dsweb/Get/Document-1779/lsst_storage_estimates.xls
For these that are interested just in the final numbers without
all the details how we derived them, just look at the very
first spreadsheet.
Let me know if you noticed any problems with the spreadsheet,
we are going to use it as an official baseline from now on
for sizing disks/deep storage for database.
Zeljko: the spreadsheet does not include your suggestions because
Kem and Tim disagreed with them (see below for their comments,
sorry, I sort of triggered a discussion with them outside of
the mailing list). If you do manage to convince them, just let me know.
Thanks,
Jacek
==============================================================
[Kem]
"Well, as we all have noted, how close to the galactic plane we go
drives the number of stars in the temporal database. Zeljko seems to
say that we will not be excluding much of the plane. If that is true,
the database could easily be a factor of 2-4 times as big. However, I
disagree with his DR20 numbers. We run out of galaxy at some point as
well as hitting the bottom of the luminosity function, so that only in a
couple of special directions does the stellar density rise significantly
beyond about 25 magnitude. See the plots in Robin etal astroph/0401052."
[Tim]
"I agree with Kem on this one: the star counts start to flatten out
beyond r=25 so I think Zeljko is coming up with numbers that are too
high. The big factor is still whether we go right into the galactic
plane. Not much weak lensing there... "
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