Down and Up (Aug 18 2009)


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Message boards : Technical News : Down and Up (Aug 18 2009)

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Profile Matt Lebofsky
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Message 927016 - Posted: 18 Aug 2009, 22:41:06 UTC

Outage day, usual drill: shut everything down, back up the mysql databases, fire off a science database backup as well while we're at it, compress the mysql tables (which get fragmented over the course of a week), and start everything back up. As far that was concerned, everything went smoothly.

However, we were hoping to hook up a couple extra solid state drives to the new replica server mork. The plan was to put some mysql logs on these drives to help unload extra i/o from the rest of the database drives. We got all the hardware in place and hooked it up today, only to find the server BIOS wasn't seeing these drives. In the time allotted for this task I determined this was either due to (1) bad cables, or (2) motherboard weirdness. Since this is an Intel donated server with an "experimental" motherboard, all best are off. I did prove we could see the SSDs when I swapped cables around, but given the current setup we couldn't run normally like that (long story). In any case, I think we're fine without these drives for now, and may still go along with the plan to make mork the master next week.

Other than that, radar blanking woes continue. I'm going to have Eric and Jeff look at my code tomorrow and point out what I'm doing wrong, if anything. I also hope to get some version of the NTPCkr page online tomorrow (he says with little fanfare).

- Matt

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Profile Gary Charpentier
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Message 927018 - Posted: 18 Aug 2009, 22:44:33 UTC - in response to Message 927016.

Yeah!

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Profile Johnney Guinness
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Message 927021 - Posted: 18 Aug 2009, 22:55:14 UTC - in response to Message 927016.

I also hope to get some version of the NTPCkr page online tomorrow (he says with little fanfare).

- Matt

Yipeee :)

Cool, well done Matt, well done!

Very exciting! We will try to go easy on you to give you time to get the bugs ironed out!

John.
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Message 927111 - Posted: 19 Aug 2009, 11:19:35 UTC - in response to Message 927016.

Matt,
I have a newer Core i7 motherboard, and the BIOS specifically states that it does not support SSD drives with the on-board controller. So, I assume if you could find some PCIe SSD controller that your plans could be done.

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Message 927147 - Posted: 19 Aug 2009, 15:28:05 UTC

Thanks for keeping us informed!

C
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Message 927180 - Posted: 19 Aug 2009, 18:07:56 UTC - in response to Message 927111.

Matt,
I have a newer Core i7 motherboard, and the BIOS specifically states that it does not support SSD drives with the on-board controller.

What model is it?
As far as hardware & software is concerned, a SSD is no different to a mechanical HDD- they both use the same interface.
Any hardware/software that is SSD aware wouldn't allow the device to be defragmented, would provide support for SSD specific commands (eg Trim) and would disable caching for the device. But for all other instances a SSD/HDD are the same.
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Message 927214 - Posted: 19 Aug 2009, 19:07:19 UTC

Not to complain, or anything, but the Science Status page hasn't had contact with Arecibo for weeks, and the "signals already found" just show blanks...

Also the overflow rate has been stuck at 4.4% for the same length of time...
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Message 927461 - Posted: 20 Aug 2009, 14:01:43 UTC - in response to Message 927180.
Last modified: 20 Aug 2009, 14:02:43 UTC

What model is it?

Gigabyte UD3R-SLI

I should also mention that the limitation of the SATA controller is stated for ACHI mode. I'm not sure if RAID mode has the same limitation. You would think: no problem running SDD, but I have not tried it.

Message boards : Technical News : Down and Up (Aug 18 2009)

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