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 up to with Project Lightning?”
We all are kind of waiting to find that out now aren’t we? EMC
announced Project Lightning as their foray into the server side flash
business, putting it sites on the nice people at FusionI/O, STEC and others.
I am wagging my tail to see EMC recogn... (more)
Whether ‘tis nobler in the mind to suffer the slings and arrows of your IT
manager or to take up cache against a sea of data. With apologies to Bill
Shakespeare, the IT Dog is discussing two different cache write policies:
write through and write back. Let me take a run at telling you what they are,
why they are different and what you need to think about when you decide what
policy to use.
Cache Write Through
This is the easier to explain and understand of the two policies discussed
here. Cache write through is like having your cake and eating it too. Data is
written into cache ... (more)
This blog is the third in a series which present test results of extensive
testing performed at Velobit to investigate SSD IO bandwidth when SSDs are
operated in a simulated enterprise environment. The test set up and
procedure is documented in the first blog post of this series which can be
found by clicking here.
Test SSD: Intel X25-V SATA based SSD
Test 1: 4 KB Data Request Size
Figure 1 shows the measured IO bandwidth as read/write ratio is varied when
the request size is 4 KB. The data shows that as the read/write ratio goes
from 100% reads to even a small percentage of wr... (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)