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[ZDNet] How SSD power faults scramble your data - Page 6

post #51 of 67
Quote:
Originally Posted by RussianGrimmReaper View Post

i don't understand how this is relevant considering data centers are SUPPOSED to use online UPS

Power gets cleaned by the UPS first, then goes to the outlet; as opposed to straight to the outlet, then when failure is detected, the UPS turns on.

You will find that UPS systems are not always regularly tested and Maintained.
I Use to work at wal-mart, and all the registers and network gear for them is on a UPS circuit so the registers can keep running until all the customers are cleared from the store.
About 2 months ago, my store had an outage. Half the registers lost power immediately. The network then lost power about 10 minutes later, before we were able to ring all the customers up. I wouldn't doubt that the UPS system hadn't been properly Tested in over a year.
Quote:
Originally Posted by willis888 View Post

Anybody have an opinion or link about how to size a UPS?
http://www.overclock.net/t/1305395/the-uninterrupting-uninterruptible-power-supply-ups-guide/0_30
Edited by Nemesis158 - 3/2/13 at 3:44pm
post #52 of 67
Quote:
Given proprietary Flash Translation Layers (FTL)

why did the industry adopt something that is proprietary?
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post #53 of 67
Quote:
Originally Posted by willis888 View Post

Anybody have an opinion or link about how to size a UPS?

Most UPS spec sheets list how long they are able to run at max load. Be sure that whatever is going to be powered through the UPS doesn't exceed it's maximum wattage under load, which will also be listed, and then just get the longest-lasting battery within your budget.
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post #54 of 67
Quote:
Originally Posted by ez12a View Post

been running my apc smart ups su1000net and it has definitely saved me from more than one power failure. thumb.gif

Damn nerds... tongue.gif
    
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post #55 of 67
I'm hoping that a random lightning strike or power surge will scramble my computer's data and cause it to become self-aware, just like Johnny 5 in Short Circuit.
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post #56 of 67
Quote:
Originally Posted by Phil~ View Post

Just Keep the OS on your SSD, and everything else off.

 

This is what I am doing, always to have backups on physical elements.

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post #57 of 67
Quote:
Originally Posted by Crazy9000 View Post

Right, because nobody would ever use the SSD for anything besides making their PC boot faster.

I'm not personally worried about it, but I can see why this could be bad for data centers. I would assume they would have enough backups that they wouldn't actually loose data though, just time restoring it.
Spends thousands of dollars on SSD

Boots 11 seconds faster.
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post #58 of 67
got my cyber-power ups 810 watt saved me a few times thumb.gif
post #59 of 67
Quote:
Originally Posted by farmdve View Post

Spends thousands of dollars on SSD

Boots 11 seconds faster.

A whole server farm filled with SSDs reduces seek times for pages and files, making the whole internet faster....
post #60 of 67
I was a server engineer stationed in a data center for a Fortune 500 company. The facility had been haphazardly expanded multiple times to make room for more servers. Call it bad planning or implementation but we were running at about 300% of the rated UPS for the entire building. There were lots of power spikes/dips/surges that the UPS could mostly account for but that only kept the servers online for about 3-4 minutes, in which time the standby diesel generators were supposed to fire up and take over. Except they didn't half the time. Even when they did (again, bad planning) only half the needed AC would run on generator. The server room would hit 100+ degrees in about 10 minutes. We had to scramble in the dark with flashlights to wedge open emergency doors and maneuver huge fans into place just to keep some airflow going. Failover to the sister site in Cali was supposed to happen automatically at around the 10 minute mark if power wasn't re-established, except half of that didn't work properly and when it did it took longer than 10 minutes.

So yeah, **** happens. If server grade SSD's are prone to blowing up just because of random power outage.... that is not good.

I learned some valuable lessons there. One was... just because a rack can hold 24 servers doesn't mean your building can handle power or cooling many entire rows of racks full of servers. Also, LABEL YOUR DAMN BREAKERS YOU FOOLS. Cannot tell you how many times we went on breaker easter egg hunts after power hits to reset them.

Another lesson they learned pretty quickly.... keep your SAN and network backbone on separate isolated UPS systems. The SAN would fail multiple hard drives with each hard shutdown. And network... yeah servers being online doesn't help if your network is down.
Edited by burticus - 3/2/13 at 7:34pm
    
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