Rule of thumb as to what the EBU parameters should be set to?
disk_io_size The best number depends on the actual disks, if they are striped or not, and the OS itself. You want to use the largest I/O size that does not degrade the disk performance. Striping gives optimal performance if you set the disk_io_size to (interleave size) * (# of stripes). Best form of striping is to stripe across controllers (or internal controllers if it’s an array of disks). Try not to use too many disks on the same controller in the same stripe to reduce the load on the controller. So if capacity is needed, consider striping sets of disks across controllers per individual controller and then concatenating the sets of stripes. Note that this configuration may not necessarily be best for transaction throughput. You should do simple tests to check first before spending the time to build database on a final disk configuration. With Legato, the best performance is achieved with disk_io_size == tape_io_size. b) tape_io_size The best number depends on how the DMO was impleme
