Outs (Sep 29 2009)


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Profile Matt Lebofsky
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Message 936715 - Posted: 29 Sep 2009, 21:36:20 UTC

Hello all - usual outage day again today. It's an interesting battle between our two mysql database servers. Okay maybe not that interesting. But mork has far more RAM, and jocelyn has a much faster disk array. And we see what we expect - mork is a much better master server as it can hold the database in memory and do all kinds of random access, but during the outages jocelyn does its database table compression much faster, as it involves a lot of sequential writes to disk. Anyway, we're back up - not much shakin' on that front.

We did have an outage last night for an hour. This was a known event involving some network infrastructure maneuvering down on campus. It was unclear how long this would take, so we didn't bother with any kind of panicky warning on the home page that we were going to be down for an unspecified amount of time. I think you're all used to that by now anyway. Plus, the good news is that this was one more task out of the way such that campus can get back to determining our bandwidth upgrade needs.

I found yet another radar blanking bug. I least I'm *finding* the bugs I guess, and it's much easier to fix them once they are spotted. Anyway, iteration 3 will commence sometime in the next day or so.

And thank you to Tiaan Geldenhuys, who donated a bit of javascript to our NTPCkr page such that if you zoom in on the Google skymap you'll see the border of the "pixel" which makes up this candidate.

- Matt

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Message 936743 - Posted: 29 Sep 2009, 23:09:17 UTC

ok, ty :)
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Message 936971 - Posted: 30 Sep 2009, 20:28:34 UTC

" I'm *finding* the bugs I guess, and it's much easier to fix them once they are spotted."

I know how you feel,
even when a full solution to the problem cannot be found,
its nice to get to the point where it is possible to touch it, an make it move.

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Message 936986 - Posted: 30 Sep 2009, 21:17:52 UTC - in response to Message 936715.
Last modified: 30 Sep 2009, 21:24:13 UTC

And thank you to Tiaan Geldenhuys, who donated a bit of javascript to our NTPCkr page such that if you zoom in on the Google skymap you'll see the border of the "pixel" which makes up this candidate.

- Matt

Yes, well done to Tiaan!

That little border is a nice little feature!

Here is a screen shot of what it looks like;



Matt its beautiful to be able to see that this project does astronomical science. Its really nice to see that we really are trying to detect other life out there in the stars.

Thanks Matt!

John.
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Message 937079 - Posted: 1 Oct 2009, 6:19:28 UTC

Wondered about what size drives your are using to transport reciever data up to CA?

1 TB drives are cheap nowadays. Let me know.

Ed
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Message 937080 - Posted: 1 Oct 2009, 6:33:08 UTC - in response to Message 937079.

Wondered about what size drives your are using to transport reciever data up to CA?

1 TB drives are cheap nowadays. Let me know.

Ed

I've always read that if you want to donate drives, it is requested that they be at least 750gb, and SATA, I believe.

Ah, here it is.. Hardware donation thread - Refer to item 4.
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Message 937081 - Posted: 1 Oct 2009, 6:33:24 UTC - in response to Message 937079.

Wondered about what size drives your are using to transport reciever data up to CA?

1 TB drives are cheap nowadays. Let me know.

Ed

You might try to PM Pappa with the question....
I think he is still helping out with hardware donations.

If I am incorrect, somebody let us know.
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Message 937111 - Posted: 1 Oct 2009, 11:58:11 UTC - in response to Message 937081.

Wondered about what size drives your are using to transport reciever data up to CA?

1 TB drives are cheap nowadays. Let me know.

Ed

You might try to PM Pappa with the question....
I think he is still helping out with hardware donations.

If I am incorrect, somebody let us know.


Me think it's Blurf. at least he did the thread in the Staff Forum.
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msattler
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Message 937117 - Posted: 1 Oct 2009, 12:38:36 UTC - in response to Message 937111.

Wondered about what size drives your are using to transport reciever data up to CA?

1 TB drives are cheap nowadays. Let me know.

Ed

You might try to PM Pappa with the question....
I think he is still helping out with hardware donations.

If I am incorrect, somebody let us know.


Me think it's Blurf. at least he did the thread in the Staff Forum.

Blurf has retired from moderating and donations, so I don't believe he is active with hardware issues either at this time.
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Profile Matt Lebofsky
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Message 937177 - Posted: 1 Oct 2009, 18:06:54 UTC - in response to Message 937117.

Just want to intercept this thread and say that we aren't exact in need of data drives going to/from arecibo. We have about 20 of them, half 500GB, half 750GB, and that's plenty, given data taking rates, etc.

Still, if you want to donate 750GB drives, we'll use them as extra data xfer drives, and as spares in our many RAIDed servers. We do NOT accept western digital drives. I think they still have problems will linux systems with about 4GB RAM (something about linux c libraries doing memory maps to disk above 4GB causes random corruption on the western digital drives - no really great for big database servers - it's a bug that I think Eric discovered and wrote a simple program to easily recreate the problem - and the linux community still has yet to fix, though I may be wrong).

- Matt
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Message 937183 - Posted: 1 Oct 2009, 18:37:34 UTC - in response to Message 937177.

Just a side note.

I've been running WD drives for over a year now using an AMCC hardware RAID controller on Fedora 11 x86_64 with 6GB ram. Perhaps the trick is "hardware RAID"?

I've had a bad experience with 2 older WD drives (80 GB) that both went bad after 2 years of use (SMART check fails, bad sectors). The newer drives (500 GB and up) good so far.

edjcox, I'd still take Matt at his word. If you are thinking of donating a drive or dozen drives, make sure they're not WD. Unless you can verify this bug is fixed. I don't want random data corruption either. :)

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Message 937210 - Posted: 1 Oct 2009, 20:59:02 UTC - in response to Message 937117.

You might try to PM Pappa with the question....
I think he is still helping out with hardware donations.

If I am incorrect, somebody let us know.


Me think it's Blurf. at least he did the thread in the Staff Forum.[/quote]
Blurf has retired from moderating and donations, so I don't believe he is active with hardware issues either at this time.[/quote]

This is true...I have retired. Any and all hardware/financial donation questions go to Uli now.
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Message 937823 - Posted: 5 Oct 2009, 22:20:32 UTC
Last modified: 5 Oct 2009, 22:20:55 UTC

I am only handling the Cash Donation issues. We are still looking for a Hardware Donation Volunteer.
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Message boards : Technical News : Outs (Sep 29 2009)

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