Dynamic validation of descriptors on disk
IBM Spectrum Scale™ can periodically scan descriptors on disk to detect and fix corruption early rather than waiting until the next remount.
The first time a file system gets mounted, a periodic validation of the nsd, disk, and stripe group descriptors gets started. This validation occurs, by default, every five seconds. The nsd, disk, and stripe group descriptors are read and compared with the corresponding descriptors in memory or cache. If there is a mismatch, that information is logged and, if appropriate, the corrupted data is fixed using data from cache.