Best Practices for building a stretched cluster with Spectrum Scale

The Spectrum Scale stretched cluster architecture is a highly-available parallel file system "stretched" across two data centers or sites. We call this an active-active configuration, because applications may access the same data sets from either site, concurrently, and enjoy file system consistency. You can learn about this architecture from the Expert Talk podcast I gave … Continue reading Best Practices for building a stretched cluster with Spectrum Scale

Getting started with Spectrum Scale Developer Edition – Downloading

Previously I wrote about IBM's Spectrum Scale Developer Edition. To get the code, you start by navigating to https://www.ibm.com/products/scale-out-file-and-object-storage. Spectrum Scale product page Click on the "Try free developer edition" button near the top. This will lead you to a form to either create an IBM account or log in using your existing "IBMid": If … Continue reading Getting started with Spectrum Scale Developer Edition – Downloading

IBM Spectrum Scale Developer Edition

IBM Spectrum Scale is a flexible parallel file system, but that flexibility comes at the price of some complexity. The well-designed command line interface and product consistency go a long way to mitigate that complexity, but it still takes time to master a technology as sophisticated as a parallel file system. Wouldn't it be nice … Continue reading IBM Spectrum Scale Developer Edition

Controlling what Spectrum Scale file systems are mounted on a node

When a node starts running Spectrum Scale, the -A attribute of each Spectrum Scale file system is checked to determine whether or not the file system should be mounted. File systems configured with -A yes will automatically be mounted when the node starts Spectrum Scale. File systems configured with -A automount will be mounted when the file … Continue reading Controlling what Spectrum Scale file systems are mounted on a node

Types of networks in Spectrum Scale

Spectrum Scale uses several logical networks for its communication.We use the term logical network to make clear that these are functions that may or may not use different physical networks, depending on configuration. Spectrum Scale daemon and administrative networks Daemon interface and network The Spectrum Scale daemon, mmfsd, runs on every active Spectrum Scale node, … Continue reading Types of networks in Spectrum Scale

File System Descriptor Quorum in Spectrum Scale

All disks in Spectrum Scale have a few pieces of information at fixed positions: Sector 1 is the "File System unique ID". This will be matched in the file system descriptor to a Spectrum Scale disk name, and is written to the disk when it is added to the file system with mmcrfs, mmadddisk, or … Continue reading File System Descriptor Quorum in Spectrum Scale

Cluster quorum and Spectrum Scale

Spectrum Scale systems are organized into clusters. File systems and underlying resources are owned by clusters, managed by clusters, and possibly exported to remote clusters. Within a cluster, there is a need for certain management functions. Because we would like the cluster to remain active even in the face of systems or network links failing, … Continue reading Cluster quorum and Spectrum Scale