I/Os Per Second
IOPS are the single best indicator of how well a solid state disk,
or any other storage device, will support database traffic. Solid state
disk drive manufacturers like to talk about low latency-- the
"lag time" in between a drive getting a request for data and
providing that data. In fact, most
solid state disk manufacturers claim latency numbers from 14 microseconds
to 50 microseconds. The truth of these numbers is borne out in the IOPS.
If all latencies are so similar, then performance for solid state disks
should be similar. In fact, nothing could be further from the truth. Our highest performing
competitor claims 40,000 random IOPS; a number that is still 5 times
less than our RamSan-220.
The RamSan-220 can deliver 200,000 random IOPS to your applications.
A single port on the RamSan-220 can provide 100,000 random IOPS. The
reason that we stress "random IOPS" is that RAID manufacturers
occasionally cite their IOPS performance. Discerning buyers should be
aware that these numbers are almost always sequential IOPS performance.
The problem with sequential IOPS is that there are almost no applications
in the real world that result in sequential small block disk access.
So why do you need IOPS? IOPS are needed to process database transactions.
Database transactions have two main characteristics: they are small
(averaging around 8K) and they are random. Small random file accesses
thrash hard disk drives. In fact, a really good disk drive can provide around 300 random
IOPS. A fast RAID can handle 5,000 random IOPS. Which brings us back to original question,
it is important to support a high number of IOPS because your servers
can support a high number of IOPS. The latest processors are operating
at over 3 Gigahertz per second. However, since the early 1980s processors
have been faster than storage. Over the last twenty years, the gap between
processor performance and storage performance has widened.
When your processor is faster than your storage, then your processor
literally waits on storage for data needed to perform calculations,
this is called I/O wait time. If your processor is waiting, then your
users are waiting. On top of that, you are wasting a significant investment
in the latest processors.
By supplying incredibly high random IOPS, the RamSan-220 eliminates
I/O wait time for all files that it stores. Because its random IOPS capabilities
are so amazing, it is possible for a single RamSan-220 to provide I/O
acceleration for multiple host servers.
When you consider our combined bandwidth and random IOPS performance
it is clear why we call RamSan "The World's Fastest Storage®".
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