Before configuring remote logging for a storage system, you must configure each remote system to receive logging messages from the storage system. A root/administrator on the receiving computer can configure the remote syslog server or rsyslog server to receive log information by editing the syslog server or rsyslog server configuration file (syslogng.conf or rsyslog.conf) on the remote system.
Reference: https://www.delltechnologies.com/en-us/documentation/unity-family/unity-p-security-config- guide/03-vxe-c-sec-config-chap-logging.htm

The storage system supports logging user/audit messages to a remote host. By default, the storage system transfers log information on port 514 using UDP.
References:
https://www.emc.com/collateral/TechnicalDocument/docu69321.pdf
(Page 31)

Explanation/Reference:
Explanation:
Attaching a snapshot is only applicable for block snapshots, and makes the snapshot available for host IO. A host must have Snapshot access or LUN and Snapshot access configured in order to access the snapshot.
When a snapshot is attached, Unisphere provides the option to create a copy of the snapshot in case the administrator wants to preserve the current snapshot view for future use.