Clogged Device Drain? Use Your Data Snake!

Lee

By Lee LaFresePlunger

Have you ever run into high I/O response times that simply defy explanation? You can’t find anything wrong with your storage to explain why performance is degraded. It could be a classic “slow drain device” condition. Unfortunately, you can’t just call the data plumbers to clean it out! What is a storage handyman to do?

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Noisy Neighbors: Finding Root Cause of Performance Issues in IBM SVC Environments

By Jim SedgwickNoisy Neighbors

At some point or another, we have probably all experienced noisy neighbors, either at home, at work, or at school. There are just some people who don’t seem to understand the negative effect their loudness has on everyone around them.

Our storage environments also have these “noisy neighbors” whose presence or actions disrupt the performance of the rest of the storage environment. In this case, we’re going to take a look at an SVC all flash storage pool called EP-FLASH_3. Just a few bad LUNs have a profound effect on the I/O experience of the entire IBM Spectrum Virtualize (SVC) environment.

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Compressing Wisely with IBM Spectrum Virtualize

Brett

By Brett Allison

 

Compressing Wisely - CompressionCompression of data in an IBM SVC Spectrum Virtualize environment may be a good way to gain back capacity, but there can be hidden performance problems if compressible workloads are not first identified. Visualizing these workloads is key to determining when and where to successfully use compression. In this blog, we help you with identifying the right workloads so that you can achieve capacity savings in your IBM Spectrum Virtualize environments without compromising performance.

Today, all vendors have compression capabilities built into their hardware. The advantage of compression is that you need less real capacity to service the needs of your users. Compression reduces your managed capacity, directly reducing your storage costs.

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How to Diagnose IBM SVC/Storwize V7000 (Spectrum Virtualize) Replication Performance Issues: Part 2 Diagnostics

Brett

By Brett Allison

 

In part 1 of this blog series we talked about how to select your SVC/V7000, replication technology that matches your business requirements, or more likely, your budget.

Now we need to think about how you can monitor and diagnose SVC/V7000 performance issues that may be caused by replication. I run into SVC/V7000 replication issues quite frequently, and have found that not all monitoring and diagnostic tools provide a comprehensive picture of SVC/V7000 replication. Further complicating matters, the nature of the technology you have selected will influence expectations and approach to problem determination.

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How to Choose the Best IBM SVC/Storwize V7000 (Spectrum Virtualize) Replication Technology: Part I Introduction

Brett

By Brett Allison

Disaster Recovery Plan

Choosing the wrong V7000/SVC replication technology can put your entire availability strategy at risk.

For most customers, there seems to be a bit of a mystery in how replication works. On the surface, it is simple. Data is written to a primary copy and either synchronously or asynchronously copied to a secondary location with the expectation that a loss of data at the primary site would result in minimal data loss and a very minimal recovery effort.

There are several types of replication, and each type has its nuances. Each of these technologies should be evaluated in light of the following business requirements:

1. Recovery Point Objective (RPO): This is the amount of data loss expressed in time units (typically minutes) that you will lose should there be a failover to the secondary site.   Continue reading

Reality Check: Living in a Virtual Storage World

Lee

By Lee LaFrese

The last decade has seen a storage virtualization revolution just as profound as what has happened in the server world.  In both cases virtualization enables logical view and control of physical infrastructure with the goal of optimization, simplification and greater utilization of physical resources.  These are lofty goals, but there is a fundamental difference between server and storage virtualization.  When a virtual server needs compute resources for an application, there is little limitation on which specific resources may be used other than maximum usage caps.  With storage resources, once data is placed on a particular storage media, an application is tied to the portion of the infrastructure that contains that media and usage caps don’t apply.  Thus, I believe performance management of virtualized storage is intrinsically more difficult and important than managing performance of virtualized servers.  In fact, George Trujillo states in a recent entry in his A DBA’s Journey into the Cloud blog that “statistics show over and over that 80% of issues in a virtual infrastructure are due to the design, configuration and management of storage”.

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Breaking Through Hard-To-Diagnose SVC Bottlenecks

Brett

By Brett Allison

 

SVC bottleneckImbalances in an SVC environment can occur in different areas. If these imbalances are significant, they can cause bottlenecks, resulting in optimization and performance issues. Using IntelliMagic Vision, it is possible to quickly discover, diagnose and resolve even the most difficult-to-pinpoint SVC problems.

Using embedded storage intelligence from our many years of developing modeling tools, we provide end-users with an easy-to-use interface to quickly identify performance issues. IntelliMagic also provides a cloud services solution where users can send data for expert analysis, in addition to providing coverage for IBM SVC, other IBM storage controllers, EMC and other hardware platforms.

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