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先给个原文链接吧：
http://techreport.com/review/270 ... -remain-after-1-5pb
techreport的SSD寿命测试还在继续，在1PB写入后只剩下840Pro、贼船的GTX和金士顿的HyperX，现在测试到了1.5PB，结果如何呢？
贼船的GTX在写到1.2PB的时候倒下了，倒下前重映射扇区爆涨，但它倒下时显示的寿命还剩下很多（从图上看至少还剩下70%）
而金士顿的HyperX呢？ 虽然通过了1.5PB写入，但却出现了不可恢复错误，也就是丢数据了
最后，840Pro在测试的过程中没有出现任何错误，包括1.5PB后做的断电一周的数据验证测试，以及每写1TB数据后做的数据有效性验证：
The Samsung 840 Pro and second Kingston HyperX 3K both reached 1.5PB with little drama. They also completed another unpowered retention test. After writing 1.5PB, the drives were loaded with a 200GB test file and then left unplugged for over a week. Both subsequently passed the MD5 hash check we use to verify data integrity.
A second hash check is integrated into Anvil's Storage Utilities, the application we use to write data to the drives. This test is configured to verify a smaller 720MB file after roughly every terabyte of writes, and there haven't been any inconsistencies yet.
实际上这三者的测试对840pro是非常不公平的，因为：
1. 贼船的GTX是240GB，留了16G做硬件冗余（硬件OP），对于这个测试能减小写入放大，减小闪存的实际写入量，同时减小主控和闪存的压力
2. 金士顿的HyperX测的是可压缩数据，也减小了实际写入量，由于数据在SSD内部被压缩存储后实际占用的闪存空间会小一些，因此相当于做了硬件OP， 同时HyperX也是240GB的盘，也有一部分硬件OP，因此写入放大更小了，同时主控和闪存的压力也小很多。 实际上另一块HyperX在不可压缩数据的写入测试中倒在了1PB之前，这说明可压缩数据能真实减小主控和闪存的压力
3. 840Pro在测试中是实打实的写入，256GB的型号也没有做特别的硬件OP，因此写入放大会高一些，闪存实际写入的数据应该远超1.5PB了，在高写入放大下，主控和闪存经受住了考验，没有报出任何错误，两次断电一周的测试都通过（断电后数据的完整性验证通过）
所以测试方techreport说从某种意义上840Pro已经胜出，当然他们还在继续做测试，并对840Pro最终拖垮HyperX充满信心：
In a sense, the 840 Pro has already won. The only other survivor, the Kingston HyperX that we're testing with compressible data, has suffered a couple of uncorrectable errors to date. Those hiccups haven't been enough to cause a complete failure, but they have left a black mark on the drive's permanent record. That record already had an asterisk to denote the fact that SandForce's DuraWrite compression scheme has dramatically reduced the amount of data actually written to the flash.
Among the survivors, the Samsung 840 Pro seems to be on track to outlast its rivals. The drive has reallocated thousands of sectors to circumvent worn-out NAND, but its SMART attributes suggest substantial reserves are still available. There have been no errors thus far.
http://bbs.mydigit.cn/file:///c:/documents
http://bbs.mydigit.cn/file:///c:/documents
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发表于 2016-3-28 23:52:39
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