12-07-2016 10:11 AM
Red Hat’s GFS2 shared file system is a popular shared file system for SAS Grid Manager. If you have recently implemented, or are planning an architecture that requires individual nodes to perform roughly 800 MB/sec or faster throughput for an individual shared file system (e.g. each SASWORK or SASDATA), you need to understand about a new issue we have found with GFS2. Recent throughput testing has uncovered throttled WRITE performance due to a spin lock that controls journal writes to the specific GFS2 file system. The spin lock can become overwhelmed by handling journal locking for competing processes with high throughput. The ceiling for a single node, against single SASWORK or SASDATA file system has shown to be around 800 MegaBytes per second.
More information will be shared as soon as it is available.
01-03-2017 10:47 AM - last edited on 01-03-2017 11:22 AM by ChrisHemedinger