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48 TB array
halfelite:
--- Quote from: rl9009 on May 19, 2009, 04:21:24 AM ---My suggestion: Build a redundant power supply system like the Dell PowerEdge systems do. You'll like it after you get one.
And yeah, since your controller does have a huge amount of RAM you might want to get a Backup Battery Unit for the controller itself and get a three or four high powered UPSes powered by at least 4 marine car batteries each.
That's how I'd do it for redundancy... It's up to you...
--- End quote ---
Without the bbu for the controller the card does not let you use the fancy cache ahead. Which is a huge speed loss. So i agree with the bbu for the controller its only 99 bucks.
rl9009:
--- Quote from: geoffreak on May 19, 2009, 04:51:32 AM ---I have to warn you that if you use the consumer grade drives like the one you linked to, they don't do well in a heavy-use environment. Make sure you get server grade drives that have a higher MTBU (mean time between failures). Don't forget that with 24 drives, at least one will fail, so be prepared for that.
--- End quote ---
WD's Hard Drives tend to last so I don't see a problem there.
halfelite:
--- Quote from: rl9009 on May 20, 2009, 12:20:09 AM ---
--- Quote from: geoffreak on May 19, 2009, 04:51:32 AM ---I have to warn you that if you use the consumer grade drives like the one you linked to, they don't do well in a heavy-use environment. Make sure you get server grade drives that have a higher MTBU (mean time between failures). Don't forget that with 24 drives, at least one will fail, so be prepared for that.
--- End quote ---
WD's Hard Drives tend to last so I don't see a problem there.
--- End quote ---
Yes but consumer grade drives dont hold up well to 28 drives all spinning at once. The vibrations might through the heads off. If it was for a business i would spend the extra money on SA drives.
-yasu-:
--- Quote from: halfelite on May 18, 2009, 05:44:27 PM ---I would run at least 2 or 3 PSU's make sure the amps on the 12v rail are high. The areca cards support different spin up times so that isnt an issue with running more then one psu. I would have a dedicated 110 line in your house for it. I would not risk running it with anything else.
Also Would be good to use more then one for redundancy. One huge psu runs the risk of dyeing and you are out of luck on downtime. Running 4 mini psu,s will be more then enough. Also something like this would work for you.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817147071
122A on the 12v rail is plenty to spin up all 28 drives. and keep them going.
Also what room air control do you have. A standard bedroom with central air would not keep the room cool. You would have to look into extra room cooling for the ambient temperature Either having a floor unit that exhausts out a window or getting a little higher end. Rack cooling is only as good as the room temp.
--- End quote ---
Your methods are very close to google's solution to power redundancy! they run a 12v tied into every rack in their shipping crate servers which is a cheap but brilliant idea. Air control consists of a central air climate control, with a stand alone AC unit that will be also tied into a backup UPS system in case power goes out. Theres also a big fan to help move the air around. Running a big PSU has its cons, but for the most part it is convenient. For server redundant power, I am going to figure out a way to utilize several car batteries on a relay. The main problem with that is the nature of car batteries tend to be unclear. I read on a site somewhere that 12v car batteries aren't really 12v, but 6 cells each at 2.1v makes 12.6 volts fully charged. I'll do an amp reading on them when I get a chance.
halfelite:
car batteries are not the way to go. They do not do good for float charge. And will only last a few months you will be spending to much on batteries.
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