Hello,
There is no clear documentation, if deisabling the logical drive will safe the data even if the drives of this array are removed during opration.
My recommendation is to disable the array, shut down the server, replace the drives with SSDs, start and configure the new SSD array. Only in case you wish to save the data on sas drives of cours. Otherwise (if data is no longer needed) you may simply remove the SAS HDDs and install the SSD while server in production.