SSD endurance is better than most people think. Imagine a 100% SSD Hadoop cluster on C-Series blades! Would like to see that in 2014.
From below link:
“In our testing, the fastest 15K HDDs write at a speed of roughly 450 IOPS for both 4K and 8K random write workloads. For 4k this equates to roughly 148 GB’s of data written per day. For 8K access, common to many server workloads, we arrive at roughly 296 GB of potential data written per day.
An entry-level SAS SSD, by comparison, can provide over 30,000 IOPS of 4k write speed and 18,000 8K write IOPS in steady state. This equates to nearly 9.6 TB of potential data writes per day for 4K access, and 11.5 TB’s per day for 8K write access. This is a huge advance over the HDD, and could necessitate throttling of the SSD to keep it within the expected warrantied workload of 3 DWPD.
With the capacity of new SSDs touching 2TB, this can provide up to 6 TB of useable endurance per day for the SSD, in comparison to the lowly 148-296 GB attainable by today’s fastest HDDs. The 2TB SSD can provide 10,950 TBs of 8K write activity over the warrantied period of five years, compared to the HDD with 534 TBs. The slower speed of the HDD negates its ability to take advantage of its nearly-unlimited endurance, while the SSD can write nearly 20X more data over five years.
Gartner estimates that by 2016 the average capacity of a deployed enterprise SSD will be more than 1.1TB. Even with smaller SSD capacities as low as 128 GB, and thus less available endurance per day, some entry-level SSDs still hold an advantage over the HDD in useable random write endurance during the warranty period. Mixed random read/write workloads will also muddy the water a bit, but it’s safe to say that SSDs have a commanding lead in useable random workload endurance”