Put what are these super fast speeds they are talking about?
+1 how fast is it? Plus the whole 500HDDs and 2 racks thing is kind of stretching it... It might take that much to reach the same transfer speeds, but it would only take 3 HDDs to match and exceed the storage capacity.
It can move random data at 3GB/s (reads), and 2GB/s (writes). It can also do 1/4 million random I/O's per second. Data isn't always about capacity, one also has to think about speed. For instance, in many database applications, only 2-3% of all files create 70-90% of actual RAID or I/O activity. SSD is best used by moving only those files (typically logs, table, tempspace and indexes) off to SSD and leaving all else on RAID. By putting just that 2-3% off to SSD, not only are the most active files on a device extremely faster than RAID, but the existing RAID will be much faster and better able to take advantage of the cache on both the controllers and the disks. Consequently, where most folks are seeing a deep dive of 10-40% over the last 2-3yrs on CPU utilization---because they've upgraded to multi-core and faster processors, as well as faster 10Gb ethernet, the effect of putting the "hot files" on SSD will make the CPU's run dramatically faster, because they are no longer waiting for the disk sets. This is an aid in not only more processing power, but in consolidating servers while attaining much higher performance. The costs saved in recurring software licenses on the servers consolidates are in many cases enough to offset the cost of the SSD.
Remember, it's not always cost per GB..or big capacity, it's how and what you do with the data. In most cases, it's actually how much does it cost be to do a transaction vs. cost per GB..where most folks only use a small portion of the disks anyway, to gain performance.
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