something at the array level? I mean your EVA I would first check your hardware-firmware-raid level-spindles...try to contact your storage vendor
once I read that changing queues is recommended when your working with your storage when you implement your infraestructure so you can see
increase performance when changing queues but I think is not recommended to do it whe you are in troubles and also in your case you have
2 storages...so this change can impact both