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https://blog.it-kb.ru/2016/08/26/system-center-2012-r2-dpm-error-eventid-945-failure-to-remove-disc-from-storage-pool-sqlexception-0x80131904-delete-statement-conflicted-with-the-reference-constraint-fk_tbl_spm_extent_tbl_spm_disk/
System Center 2012 R2 DPM - Ошибка удаления диска из Storage Pool -System.Data.SqlClient.SqlException (0x80131904): The DELETE statement conflicted with the REFERENCE constraint "FK_tbl_SPM_Extent_tbl_SPM_Disk"