For years, the solution to IO bottlenecks has been pretty consistent: (1) add
spindles to decrease seek time and increase throughput, and (2) add as much
RAM as you can so your filesystems and applications can cache hot data and
avoid disk access entirely.
These brute-force attempts to gain performance are inherently flawed and
costly. The price of increasing the number of disks in an array adds up
quick, to say nothing of the investment in additional JBODs when you run out
of slots in your array. And although the cost of consumer-grade memory has
fallen, relying upon RAM for caching in enterprise environments can get
expensive, quickly. Worse, once you run out of DIMM slots for all that RAM,
you’re left with no way to increase the size of your cache aside from
purchasing more servers and building a clustered environment.
Cheaper IOPS: SSD vs Spinning Ru... (more)
Another Reason Why SSDs Are Not HDDs
It is fairly common knowledge that SSDs differ from HDDs in many ways. SSDs
have faster IO, have no moving parts, use less power and cost more money per
gigabyte. There are other, more subtle differences between the two storage
devices and in this tech note I will focus on one of those.
What Is A Disk Drive Partition?
First, let me introduce the concept of a disk drive partition. A
‘partition’ of a disk drive (either SSD or HDD) refers to a
logical storage unit of a physical disk drive. This allows a single
physical drive to be t... (more)
Disruptive technology is a term used to describe an idea or invention that
typically disrupts an existing market, often completely displacing an earlier
technology. Sometimes disruptive is great (e.g. digital cameras and cell
phones), and sometimes disruptive is not so great (e.g. laser video disks).
SSDs are a disruptive technology in that they are clearly changing the
enterprise storage market. The verdict is still out on just how disruptive
SSDs will be; as is the case with many disruptive technologies, it is going
to take some time to figure out exactly what to do with SSD... (more)
Dr Dog Says “You Need More RAM In Your Cache Diet”
Well, I am not really a doctor, but I play one on TV. You may remember (if
you are old enough) that line from the 1986 Vicks-44 TV commercial. Anyway,
while I may not be a real doctor, I can certainly tell you about why you need
more RAM in you cache diet.
“I Think My Cache Diet Is Great”
If you were happily running your IT system but needed some additional
performance, chances are you turned to some kind of SSD caching solution to
improve performance at a lower cost point than adding more servers or
storage. You went on what I a... (more)
Solid State Disk (SSD) technology is one of the hottest IT areas in 2012. The
promise to eliminate storage IO bottlenecks and increase application
performance, enable server virtualization, enable data center growth, and
reduce IT costs has prompted 83% of all IT departments to consider SSD. But
those planning an SSD deployment face a variety of deployment choices.
Moreover, choosing poorly can yield large expense, disruption to existing IT
environments, and a complex new set of storage management tasks.
Join Brian Garrett, Vice President at the Enterprise Strategy Gro... (more)