On 05/24/2011 02:01 PM, John R Pierce wrote:
Thats why you have servers with redundant power supplies with each power supply plugged into a separate ups.On 05/24/11 10:32 AM, Gordon Messmer wrote:On 05/24/2011 09:57 AM, John R Pierce wrote:also you want SSD that has a supercap on its internal cache so pending writes aren't lost in a power failure scenario.You know, I've asked people about that in the past since the whole block read/erase/write cycle seems like a risk in the event of power loss, but never got any satisfactory answer. What manufacturers/models offer that feature? Are most drives with caps clearly labeled?I just looked at OCZ's marketing fluff--err--webpile and it appears the Vertex EX and PRO drives advertise that they have a supercapacitor. the others I sampled didn't. http://www.ocztechnology.com/ocz-vertex-2-pro-series-sata-ii-2-5-ssd.html my superficial scan of Intel's webpile didn't turn up any reference to them on the x25-e or 510 drives. ah, the intel 320 series has power failure protection which presumably means something like a supercap to supply sufficient power to complete any pending write cycles.. There's an article on anandtech detailing datalosses on many SSDs on power failure scenarios. (and, please folks, UPS's are great, but they fail too, you can't rely on them for data protection). --
Stephen Clark NetWolves Sr. Software Engineer III Phone: 813-579-3200 Fax: 813-882-0209 Email: steve.clark@xxxxxxxxxxxxx http://www.netwolves.com |
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