This looks like a database error where the SMS service is getting back a duplicate entry for the iSCSI target list
2013-02-14 02:03:59,733 [pool-7997-thread-2] ERROR com.vmware.vim.sms.provider.VcProviderImpl - Got duplicate entries for non ISCSI Targets2013-02-14 02:03:59,733 [pool-7997-thread-2] ERROR com.vmware.vim.sms.provider.VcProviderImpl - PopulateStorageInfoTask Failed :
Would be best to open a support case on this, as the error does not really tell us what the duplicate entries are, honestly