Regardless of the vendor hardware in use, device mapper creates a block device under /dev/mapper/ for each LUN attached to the system. Multipathing aggregates the I/O paths, creating a new device that consists of the aggregated paths. These I/O paths are physical SAN connections that can include separate cables, switches, and controllers. What is Device Mapper multipathĭevice Mapper Multipathing (or DM-multipathing) is a Linux native multipath tool, which allows you to configure multiple I/O paths between server nodes and storage arrays into a single device. There are many vendor specific multipathing implementations like EMC’s powerpath and Symantecs VxDMP. Multipathing ensures that the system uses multiple physical paths to provide redundancy and increased throughput. To avoid such single point of failures, multipathing exists. The path can be severed due to many reasons like faulty HBA, faulty cable etc. SIS.DM or SISX.DM files are basically the SIS and SISX files with added DRM data to it and changed file extension.
The dm file stores mobile application, media clips, ringtones or any other data digitally signed with DRM. A path is a connection between a server and the underlying storage. The dm file extension is used for SIS or SISX installation files used on Nokia Ovi app store.
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