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发表于 2010-4-30 21:25:54
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2010 年 4 月 30 日
Okay it's been a while and nobody else is chiming in so here are some general random updates. Sorry these are so few and far between. Not my fault.
We did successfully, finally, split the informix databases up. Instead of both redundantly housing SETI@home and Astropulse, one is specifically running SETI@home, and the other Astropulse. We lost our redundancy, but we back these systems up weekly and in a pinch can always regenerate lost data by splitting it again and sending it out to y'all. What we gained was a massive amount of i/o. Actually more like the Astropulse i/o isn't clobbering normal SETI@home day-to-day operations anymore. Like all things, this procedure took far longer than expected - mostly due to one of the SETI@home tables being strangely hard to drop off the one server that no longer needed it - something about a user-defined type in that table causing informix to crash when the deletes were done en masse.
There are still the usual set of other systems projects or problems waiting for our time and attention. Our master mysql server, mork, has been stable but may reboot itself unexpected at any point. Luckily when this happens recovery has been short and painless. We'd replace this system, but need another system with similar drive space and cpus and 64GB RAM which we don't have. Even worse is our main file server (which, among other things, houses our web site and home accounts) is slow and also prone to unwarranted random crashes. Some systems still need an OS upgrade. I also want to rebuild the RAID on thumper...
In brighter news, the gigabit link project got a kick in the right direction. Short story: turns out the whole lab wants a gbit connection to campus and suddenly has some discretionary funds for this. So we might partially piggy-back on that bandwidth. Anyway, the increased-bandwidth patient still has a pulse. Of course, we haven't really our own 100Mbit ceiling too much lately, so this is hardly an emergency at the moment.
Also... our data drive bay down at Arecibo was broken. We finally shipped them our bay working here at Berkeley just so they could continue to collect data, but that meant we could read new disks, only process data already on disk (or in our archives, i.e. old stuff that had yet to be properly processed). Anyway, we got the broken bay sent up here last week and Jeff found it was just a bent pin in the cable that connects to the power supply, so we have two functioning bays again in the two separate locations, and are reading newer data off drives for the first time in a while.
Other than that (and the usual set of minor tweaks and crashes that require a few minutes here and there) we've been running fairly well in a steady state. Dan continues to mostly work on CASPER stuff. Dave is working entirely on BOINC development. Jeff and Bob are manning the general data pipeline. Jeff and Eric are working on NTPCkr stuff - mostly RFI analysis/excision and candidate rescoring. While I seem to be part of all projects around here (like everybody) I've been forcing myself away from systems stuff except as needed - another reason why I've had little motivation to write tech news reports.
I've been mostly working on data quality stuff - one program that injects fake signals into raw data to test various parts of our blanking/analysis suite, and a bunch of other programs to test basic data integrity. Stuff that should have been done years ago, but better late than never. In short, the results are pretty much all good, but there are several database corrections of varying magnitude which need to be carried about before we can truly reduce the data even more. Stuff like pointing corrections, or general rescoring.
The basic game plan, as it has been, is to rally behind the NTPCkr suite once the RFI/scoring stuff is working and the science database can handle the full analysis load in earnest. If you're frustrated by lack of advancement on this front, maybe it'll help to think of all the previous NTPCkr pieces made public part of a "proof of concept beta test." We do hope to have this rolling, complete with volunteer analysis and input, sooner than later. It's funny the SETI institute is working on their own volunteer analysis project. Basically just another thing that gets the public confused about who actually manages SETI@home. Anyway, you know how little labor resources we have, so we do what we can.
By the way, that NASA balloon project that crashed and burned this morning involved the great efforts by several of our lab mates here at Berkeley. Many years of planning/production lost in an instant. Total bummer.
- Matt
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发表于 2010-3-25 09:58:24