Now, media failures, now the actual, as you look into increasing prevalence now, most enterprise drives are designed to actually withstand media failures with, so most of the drives, enterprise drives today have something like an onboard XOR or a RAID engine - or you know some vendors call it fail in place - but basically enterprise SSDs are able to withstand failures, so not only just specific blocks or page failures, but also entire die failures. And I'm not going to say that they can't exist, but things like capacitor failures or resistor failures or ASIC failures just aren't that common.
SSD HEALTH CHECK TOOL PLUS
So, in the long lifecycle, so enterprise and data center NVMe SSDs take a long time to get to market, so generally it's a year plus lifecycle and in that there's quality and reliability tests, there's validation, there's hardware screening, there's SSD controller power on - I mean all this stuff happens.Ġ3:12 S1: And a lot of the hardware issues get weeded out. But, basically, in a lot of use of enterprise drives even with one in three drive writes per day, class drives being the mainstream drives today, endurance failures are not very common just because one, they're understood very well and two, most customers just are not using that much endurance - and we'll talk a little bit of that when I look at some case studies. I wrote the model at /endurance based off some Python scripts that basically do this, basically monitoring the right implication and projecting the endurance.
For one, endurance, you can monitor it with smart – well, I'll talk a little bit about it when I show the smart logs - but you have a something called percent used in NVMe, which is basically the gas gauge that shows what percentage of the endurance you've used and you also have available spares and reserve spares, that's part of the standard NVMe smart log where you can monitor endurance. And if you think about things where most people think SSD failures happen from endurance or hardware failures, but actually, if you look at this, this is a very, very small percentage of actual failures. So, one of the things, you know this is very important for monitoring the health of SSDs because the increased prevalence, obviously, is where to look for as far as what the likely candidate of a failure is. So, the first thing is really about how SSDs fail. I used to run a validation team at Intel, so, obviously, I know a lot of the failure mechanisms of SSDs in general.Ġ1:04 S1: Two, I've helped kind of work and refine and define a lot of the features in NVMe today based off lots of customer feedback, based off all the partners that are part of NVM Express kind of contributing to the overall specification as far as trying to accomplish these goals. So, without further ado, I'm going to go walk you guys through some of the interesting things that I think, that I see, of monitoring the health of NVMe SSDs, just from experience.
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