RAID controller failures destroy arrays because metadata is locked to specific controller hardware

Hardware RAID controllers store array configuration metadata (disk order, stripe size, parity layout) in formats proprietary to the specific controller model. When a RAID controller fails, replacing it with even the same brand but a different model or firmware revision can cause it to fail to recognize the existing array — or worse, initiate an automatic rebuild that overwrites existing data. So what? A small business running a 4-drive RAID 5 array on their file server loses access to all data when the controller fails, even though all four drives are perfectly healthy and contain all the data. So what? Professional RAID data recovery services charge $1,500-$5,000 and take 3-10 business days, during which the business has zero access to shared files, accounting data, and customer records. So what? For a 10-person architecture firm or law office, 5 days without their file server means missed court filings, delayed construction drawings, and potential contractual penalties — the downstream cost can reach $50,000-$100,000. So what? After recovery, the business discovers that their 'hardware RAID for reliability' was actually a single point of failure more fragile than the drives themselves, and they must either buy an identical spare controller (which may be discontinued) or migrate to software RAID (ZFS, mdadm) — a multi-day project requiring a full data migration. So what? The entire value proposition of hardware RAID — 'set it and forget it reliability' — is revealed as misleading for organizations that cannot stock identical spare controllers and lack IT staff to manage recovery. This persists because RAID controller vendors use proprietary metadata formats as competitive lock-in, there is no industry standard for cross-controller array portability, and the RAID controller market has consolidated to a few vendors (Broadcom/LSI, Microchip/Adaptec) who have no incentive to standardize.