GSM

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GSM (Global System for Mobile Communications: originally from Groupe Sp├ęcial Mobile) is the most popular standard for mobile telephony systems in the world. Obviously, iSCSI over GSM therefore is important, because an open method to access GSM radio hardware allows a mobile device to access unlimited amounts of block level storage across iSCSI.

One of the primary benefits of this SAN architecture is that iSCSI storage resources are available transparently to the mobile's applications.

New possible applications include the capability of both saving and retrieving content, including video, audio, images, block and filesystem level bits from remote storage resources, transparently to all existing mobile applications. With GSM/GPRS, these are typically constrained by known network link limitations, cost of service, cost of hardware, and hardware availability. GSM/GPRS allows vendors to take existing mobile hardware and apply software updates to exceed the hardware's physical storage limitiations. Taking advantage of both iSCSI and iSNS software components in a manner that brings value to software offerings on open hardware platforms is the end result.

First successful test of an iSCSI/GSM camera phone prototype saving an image via GPRS.
OpenWRT on the Linksys WRT64G. Note that this photo was taken with a 1.3 MP Motorola ROKR E2 camera and saved over iSCSI/GSM.

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A number of mobile devices already use iSCSI to access remote media assets over GPRS via tri-band GSM IP storage services with a Linux v2.4 kernel, see e.g. Motorola ROKR E2. Multipathing features such as MC/S and ERL=0 are essential to enable reliable iSCSI across WANs and cellular networks.

The main limiting factors that exist for obtaining iSCSI anywhere, anytime and on any mobile for storage resources are:

Client
GPRS bandwith availability, system memory for various forms of caching and a read-only/read-write filesystem considerations, and an Initiator on your mobile device.
Server
A working iSCSI target with blocks containing a filesystem that the mobile can understand.

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