On 05/24/2011 02:01 PM, John R Pierce wrote: > 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). > > Thats why you have servers with redundant power supplies with each power supply plugged into a separate ups. -- Stephen Clark *NetWolves* Sr. Software Engineer III Phone: 813-579-3200 Fax: 813-882-0209 Email: steve.clark at netwolves.com http://www.netwolves.com -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.centos.org/pipermail/centos/attachments/20110524/781cc9f4/attachment-0004.html>