Not all SSDs are Created Equal

Results of the SNIA PTS on Seventeen SSDs and one HDDSSDs vary widely in performance.  This is something that becomes amazingly clear when a number of these devices are put through a battery of tests.

Calypso Systems ran the SNIA SSD Performance Test Specification (PTS), outlined in an earlier post in this blog, on seventeen SSDs and a single HDD.  The results appear, in miniature, in the graphic for this post. Continue reading “Not all SSDs are Created Equal”

An HDD Cache for an SSD?

University of TorontoA colleague – Isilon’s Rob Peglar – pointed out an interesting paper written by researchers at the University of Toronto in collaboration with Microsoft.  The paper makes a case for using an HDD to cache writes to an SSD to improve storage system performance.

“Wait a minute!” you say.  “An HDD as a cache for an SSD?  This can’t be possible!” Continue reading “An HDD Cache for an SSD?”

What’s the SNIA SSD Performance Test Specification (PTS)?

Click Here for the SNIA SSSI PTSThe Storage Networking Industry Association – SNIA – determined a few years back that it should address SSDs since they were about to become an important part of most storage systems.  To this end SNIA created the Solid State Storage Initiative, or SSSI.

They didn’t name it after SSDs since there will clearly come a time when flash stops pretending it’s an HDD and abandons standard HDD mechanical and interface specifications. Continue reading “What’s the SNIA SSD Performance Test Specification (PTS)?”