SSD Write Endurance 25nm Vs 34nm

[stevecs]

@anvil- you're correct, sorry (always thinking a generation ahead) but I meant the 510/elmcrest not the 520/cherryville. Problem with the 3xx is that they're all 3Gbps, not a problem in itself (as I don't except a single drive to do more than 100MB/s) but I'm looking to put them all into external chassis so want to make sure that all are running at 6gbps for the expander(s). (I've run into problems before mixing/matching, it's better to have everything the same signaling).

@Ao1, yes, that's what I thought as well. I was actually planning on 28% or so over-provisioning for whatever SSD. Just trying to pick the right ones for the workload. Since this is a 'write cache' drive (it's main purpose is to cache all random writes to the back-end datastore which is ~200TB) with about 100GB/day I don't want to have the replacement issues at work (don't know the actual brand, but EMC&Oracle use SSD's for their Tier 0 in the sans, for heavy database functions they don't last a year. Not a big deal as the client's are paying for the speed so the thousands $$/drive is not an issue. A 'little' different for a home system however.

[Ao1]

Don't know if this will help but as a guide the Intel 320 is spec'd for around 15TB with a 4K 100% random workload over the full span. (TB varies depending on drive capacity). Reducing the span and adding over provisioning will increase write capacity significantly, but 200TB of random 4K writes is going to be a tall order for any non enterprise SSD any way you try to cut it.