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March 14th, 2010, 09:27 PM
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#1 |
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Trustee
Join Date: Dec 2006
Location: Central Coast - NSW, Australia
Posts: 1,606
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UPS for raid?
I've read that a UPS is recommended with a raid configuration but I'm not sure why.
when the power goes off - with a single drive you lose any data that is being written to disc but files on the disc are intact. with a raid configuration surely its' the same, even if the data is spread over 3 or 4 drives you would still only lose any files currently being written to disc or am I wrong? |
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March 14th, 2010, 09:30 PM
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#2 |
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Inner Circle
Join Date: Sep 2002
Location: Vancouver, British Columbia (formerly Winnipeg, Manitoba) Canada
Posts: 4,088
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Heads crashing into platters would be one good reason.
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Shaun C. Roemich Road Dog Media - Vancouver, BC - Videographer - Webcaster www.roaddogmedia.ca Blog: http://roaddogmedia.wordpress.com/ |
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March 15th, 2010, 01:03 AM
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#3 |
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Go Go Godzilla
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A UPS should be used for *any* system and it's mission-critical components to protect against power failure. The main CPU, main monitor, RAID enclosures you name it. If you don't use one it's like not wearing a seatbelt; it's not a question of *if* you'll have a power outage it's when. It's cheap insurance - get one and rest easy.
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Robert Lane Producer/Creator - Bike Pilots TV |
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March 15th, 2010, 09:58 AM
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#4 |
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Inner Circle
Join Date: Sep 2002
Location: Vancouver, British Columbia (formerly Winnipeg, Manitoba) Canada
Posts: 4,088
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As well, a UPS provides "top up" benefits for brownouts when voltage drops but doesn't completely blackout.
My UPS reported 167 "events" in a year and a half at my old home and zero so far in the past 8 weeks since it has been online in Vancouver.
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Shaun C. Roemich Road Dog Media - Vancouver, BC - Videographer - Webcaster www.roaddogmedia.ca Blog: http://roaddogmedia.wordpress.com/ |
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March 15th, 2010, 04:10 PM
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#5 |
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Inner Circle
Join Date: Oct 2001
Location: Honolulu, HI
Posts: 2,054
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Paul... If the file being written to the disc happens to be the directory, then it'll really mess things up on both drives.
As others have said, if it's important, protect it. A hundred bucks is cheap compared to the potential of losing hours of hard work, and the additional hours it would take to get it all back working again. I got a Tripp Lite recently from Costco to replace an aging UPS.
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Dean Sensui Exec Producer, Hawaii Goes Fishing |
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March 15th, 2010, 09:04 PM
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#6 |
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Major Player
Join Date: Sep 2003
Location: Shanghai
Posts: 344
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A UPS is REALLY good cheap way to cure poor AC quality.
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boxoutsidemedia.com |
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March 15th, 2010, 11:53 PM
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#7 |
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Regular Crew
Join Date: Feb 2004
Location: Southern, CA
Posts: 198
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All of the above are true provided the UPS has automatic voltage regulation and you're truly running off the battery at all times. Cheap UPS units are auto switching and the battery only comes online in the case of a power outage. They don't handle brownouts and may not clamp an instantaneous voltage spike. You get what you pay for.
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March 16th, 2010, 09:26 AM
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#8 |
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Major Player
Join Date: Sep 2003
Location: Shanghai
Posts: 344
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bad power here, a massive amount of construction tapping into the local power lines. i had sudden shut downs, usb thumb drive ejects, non starts, usb audio preamp and monitoring device that would unmount and I'd need to plug in again. Funny, NEVER had a blackout here, or really even noticeable brown outs, but the power is crap.
I have a cheap APC 650 UPS, cured all the above problems, doesn't work on battery but been fine.
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boxoutsidemedia.com |
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March 17th, 2010, 10:42 AM
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#9 | |
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New Boot
Join Date: Mar 2010
Location: San Diego, CA USA
Posts: 22
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Quote:
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March 17th, 2010, 10:49 AM
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#10 | |
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New Boot
Join Date: Mar 2010
Location: San Diego, CA USA
Posts: 22
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Quote:
If the drives are striped (raid 0) and something bad happens all the drives will be affected. Even if the drives are mirrored (raid 1) they could all have corrupted data written to both disks. Most of these raid setups will protect you in the case that you have a drive failure, but not against power outages and corrupted data written to the discs. UPS is a good idea. |
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