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Running megacli -encinfo -a2 | grep Vendor will show that DELL is the vendor name, and the serial number.
In the example below, the serial number is HSH5T2.
megacli -encinfo -a2| grep Vendor
Vendor Identification : DELL
Vendor Specific : HSH5T2
Remember, when requesting a drive replacement for a failed drive, include the line from the lsi-show output indicating the failed drive, the enclosure serial number, along with the shipping address and contact name and phone number.