The HUS 110 went EoA way back in June 2019, it was already 7 year old architecture, so now 10 years.
Hitachi will not supply any replacement parts, and will not allow 3rd party "substitute" disks, had a client that tried unsuccessfully.
You can replace/consolidate many HUS's onto a single VSP E or G series.. a much smaller footprint for much better performance.
Highly suggest you call your sales team.
Regards