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Physical devices don't have SLAs, because they aren't services. SSDs have the physical equivalent of an SLA, a warranty. I haven't seen stats, but in my exper

Physical devices don't have SLAs, because they aren't services. SSDs have the physical equivalent of an SLA, a warranty. I haven't seen stats, but in my experience the odds of an SSD dying within the warranty period is very very low. If you want your storage to have an SLA, storage service providers exist, and will be happy to give you an SLA if you're willing to pay. But it isn't cheap.

lisper 8y ago
> Physical devices don't have SLAs Yes, I know that. That's why I said "essentially". > SSDs have the physical equivalent of an SLA, a warranty. There are two orthogonal issues. The first is what happens when a device fails. A warranty addresses that. The second is how does it fail. Does it fail all at once with no warning, no way to perform post-mortem diagnostics, and no way to recover the data? Or does it fail with a gradual degradation of performance and capacity over time, and in a way that, if/when total failure occurs, the cause can be ascertained and the data still recovered somehow?
- deleted 8y ago
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- notatoad 8y ago
  >Does it fail all at once with no warning, no way to perform post-mortem diagnostics, and no way to recover the data? Or does it fail with a gradual degradation of performance and capacity over time, and in a way that, if/when total failure occurs, the cause can be ascertained and the data still recovered somehow? how does that have any relation to an SLA? An SLA is a promise of a certain amount of uptime, with financial penalty for the provider if not met. A warranty is a promise of a certain product lifespan, with a financial penalty for the provider if not met. SLAs have nothing to do with providing diagnostic information.
Dylan16807 8y ago
A warranty is like an SLA that only refunds you the percentage of time the service was down. It's not nothing, but it's extremely weak. They're more worried about annoying you than the pennies of lost profit, and your payout isn't nearly enough to make up for the trouble caused.

lisper 8y ago

> Physical devices don't have SLAs Yes, I know that. That's why I said "essentially". > SSDs have the physical equivalent of an SLA, a warranty. There are two orthogonal issues. The first is what happens when a device fails. A warranty addresses that. The second is how does it fail. Does it fail all at once with no warning, no way to perform post-mortem diagnostics, and no way to recover the data? Or does it fail with a gradual degradation of performance and capacity over time, and in a way that, if/when total failure occurs, the cause can be ascertained and the data still recovered somehow?

deleted 8y ago
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notatoad 8y ago
>Does it fail all at once with no warning, no way to perform post-mortem diagnostics, and no way to recover the data? Or does it fail with a gradual degradation of performance and capacity over time, and in a way that, if/when total failure occurs, the cause can be ascertained and the data still recovered somehow? how does that have any relation to an SLA? An SLA is a promise of a certain amount of uptime, with financial penalty for the provider if not met. A warranty is a promise of a certain product lifespan, with a financial penalty for the provider if not met. SLAs have nothing to do with providing diagnostic information.

Dylan16807 8y ago

A warranty is like an SLA that only refunds you the percentage of time the service was down. It's not nothing, but it's extremely weak. They're more worried about annoying you than the pennies of lost profit, and your payout isn't nearly enough to make up for the trouble caused.