Back in early June, we posted on this blog a short article about the announce of new Easy Tier features , delivered with the IBM DS8870 Release 7.1.
One of those new significant new feature is the Easy Tier Server. We just released a new IBM RedPaper that gives you an insight into the concepts , architecture and implementation of that feature.
Easy Tier Server allows the most frequently accessed or hottest data to be placed (cached) closer to the hosts, thus overcoming the SAN latency. This feature, introduced with the IBM DS8000 DS8870 LMC 7.7.10.xx.xx leverages the integration between AIX hosts and DS8870 by implementing advanced caching coherency algorithms.
Essentially, Easy Tier Server copies the DS8870 hottest data to Solid-State Drives (SSD) also known as Flash devices, directly attached to Easy Tier Server-enabled hosts. Easy Tier Server caching coherency algorithms make sure that the most valuable data is available on the host local SSD devices and also, guarantees data integrity across DS8870 internal tiers and AIX hosts flash cache.
The Easy Tier Server core concept lies on DS8870 cooperating with heterogeneous hosts to make a global decision on which data to copy to hosts local SSDs, for improved application response time.
The Easy Tier Server feature has been extensively tested by IBM and the test results have shown that it can improve overall response time up to five times.
In preparing this IBM Redpaper publication, we set up an environment with Easy Tier Server enabled on a DS8870 Storage System and a Power 770 host, attached to an EXP30 Expansion Enclosure with SSD devices.
Within this environment, we were able to constantly generate random OLTP workload to a set of DS8870 LUNs on the Power 770 host, periodically changing the I/Os pattern, thought. The results are shown in the graph.
The tests’ results turned out to demonstrate a very good performance improvement achieved by the application after Easy Tier Server implementation, with an impressive 4 times improvement on the overall response time to the application
To read and learn more about the Easy Tier Server feature , refer to the IBM System Storage DS8000 Easy Tier Server, REDP-5013.
You can also read Redpapers about the other new Easy Tier features, respectively: