SSD reliability during power failures

[Mark Nelson <mark.nelson@xxxxxxxxxxx>]

For those of you who are using SSDs for journals, especially on 
controllers without battery backed cache, this is probably a useful read.

http://lkcl.net/reports/ssd_analysis.html

I suspect we'll see that it may not just be the older Intel drives that 
are ignoring CMD_FLUSH as Stefan found.

Mark
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