Werk #12641: dell_compellent_disks: introduce unique item description

Component	Checks & agents
Title	dell_compellent_disks: introduce unique item description
Date	Mar 22, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Incompatible - Manual interaction might be required
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p23 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The service description for Dell compellent storage disks contained the internal disk number, which unfortunately can change between multiple SNMP-requests. As a result the mapping of disks to services could change and one single disk health status could be reported to changing services. The service description was changed to use the "DELL-STORAGE-SC-MIB::scDiskNamePosition", which contains the enclosure number and the disk number. This scDiskNamePosition will remain stable across multiple SNMP-requests. All services of this plugin must be rediscovered.

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