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)
IT Dog getting down and dirty today because that’s what it is going to
take to deal with the dirty world of “vendor lock-in.” There is
really no way to dress this up and make it smell nice because it just stinks
and although I would roll in something this nasty down at the dog park, I
wouldn’t want you to have to live with the smell.
I read an excellent article by Chris Mellor at The Register discussing the
need to develop a standard for the server flash-storage array interface and
it really got me thinking about the vendor lock in issue.
“What is EMC... (more)
George Crump from Storage Switzerland recently wrote an article, arguing that
it is better to deploy SSDs in a storage array instead of as a server cache.
The article was sponsored by Pure Storage which happens to sell SSD based
George identifies challenges with SSD caching and tiering solutions. While
some of the topics he raised in the article are valid, he does not present
all sides of these topics. As a result, the article contains positions that
overstate the magnitude of the problems and may lead the reader to the wrong
conclusion. I would like to present ... (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)
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)