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osd-target: extension: Let in a system_ID set on LUN format
system_ID is a, factory set, unique identifier of an osd-lun. Since osd-target is a software solution we should enable a system administrator setting of the system_id. The solution proposed here is to let a system_id attribute- set while an OSD_FORMAT is preformed on the osd-lun. Rational is: since we are initializing a new backing storage to host the osd-lun we can at this time set it's name, and by that lock it permanently until a new format initializes a new osd. Thous, regular osd utilities can be used to set the system_id and no special command line or config files magic is needed. The system_id set can be up to RIAP_OSD_SYSTEM_ID_LEN bytes in size, and if smaller is zero left-padded. Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
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