MegaRAID: what does "Is VD emulated: No" mean

When executing “MegaCLI -LdInfo -LdAll -a0”, some of my servers report a property “Is VD emulated: No”, and some report “Is VD emulated: Yes”. I could not find an explanation for this setting, or how to change it.

The storcli program allows to “set emulationType=0|1|2” but it does not affect the mentioned flag.

The servers are different, some have SAS drives, other have SATA drives, also some are using original LSI cards, other use SuperMicro clones.

Can someone explain what this setting is, and whether it might affect the performance?

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