My RAID card does not currently have a battery installed and its write mode is set to write-through. Data is rarely written to the RAID - large batches of data come in maybe every other week. Daily use is read-only. The card hosts 4 different RAID volumes, each being around 12 TB large.
I'm trying to assess the risk of my RAID being unrecoverable if the card fails. Have you ever seen a RAID card turn bad and render the RAID unusable when the card was replaced?