** Revised Feb-12, 2018

While this article is about InterSystems IRIS, it also applies to Caché, Ensemble, and HealthShare distributions.

Introduction

Memory is managed in pages.  The default page size is 4KB on Linux systems.  Red Hat Enterprise Linux 6, SUSE Linux Enterprise Server 11, and Oracle Linux 6 introduced a method to provide an increased page size in 2MB or 1GB sizes depending on system configuration know as HugePages.

At first HugePages required to be assigned at boot time, and if not managed or calculated appropriately could result in wasted resources.  As a result various Linux distributions introduced Transparent HugePages with the 2.6.38 kernel as enabled by default.  This was meant as a means to automate creating, managing, and using HugePages.  Prior kernel versions may have this feature as well however may not be marked as [always] and potentially set to [madvise].  

Transparent Huge Pages (THP) is a Linux memory management system that reduces the overhead of Translation Lookaside Buffer (TLB) lookups on machines with large amounts of memory by using larger memory pages.  However in current Linux releases THP can only map individual process heap and stack space.

Last comment 22 February 2017
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Enterprises need to grow and manage their global computing infrastructures rapidly and efficiently while simultaneously optimizing and managing capital costs and expenses. Amazon Web Services (AWS) and Elastic Compute Cloud (EC2) computing and storage services meet the needs of the most demanding Caché based application by providing
 a highly robust global computing infrastructure.

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September 24, 2018 – Advisory: VMWare vSAN and Data Integrity

Clients running vSAN 6.6 or later should review a very important article that VMware published on September 21, 2018.  The article describes the possibility of file system and database corruption, which can lead to outages and possible data loss, and we believe that some of our clients have encountered this issue.  Therefore, we encourage you to act on this as soon as possible.

The VMWare knowledge base article is titled:

Virtual Machines running on VMware vSAN 6.6 and later report guest data consistency concerns following a disk extend operation (58715)

 

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If you are attending Global Summit 2018 please be sure to say hello to George James Software in the Partner Pavilion.

You are also invited to the informal lunchtime meeting we're hosting at Global Summit on Tuesday 2nd October from 1pm in Indian Paintbrush, a meeting room at the conference venue. We will be previewing the next versions of Deltanji, our integrated source code management solution, and Serenji, our editor and debugger.

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