This log service is used by 64 bit application that loads the PI API. The most common being 64 bit PI Interfaces. Therefore if you have 64 bit PI API based applications, these scripts should start/stop the service for you. Please contact tech support if you have these applications and pilogsrvx64 is not in your pisrvstart and pisrvstop scripts.
As a side note, recent releases of the PI Server implements virtual service accounts for all the Data Archive related services so please consider it for an upgrade.
