122 to 204 MB/sec old if efficient writing all would take about an hour. 200 to 300 MB/sec new. if efficient writing all 600gb woudl take 2400sec. so it should be maybe 2x faster. So to get 20 hours, I am going to guess the old disk had the write cache turned off and the disk working badly, that would explain it being that much slower. It may mean all of the old disk has the write cache on the disk disabled and the new one does not have it disabled, or the hardware raid is more efficiently working with the write cache off with the new disk vs the old disk. Or it could be the write cache is the same and the new disk with new firmware works better with command queuing so wastes less time seeking back and forth. On Tue, Dec 1, 2020 at 11:15 AM Gandalf Corvotempesta <gandalf.corvotempesta@xxxxxxxxx> wrote: > > Il giorno mar 1 dic 2020 alle ore 14:01 Roger Heflin > <rogerheflin@xxxxxxxxx> ha scritto: > > So what is the model of each disk and how big is the partition used > > for the array on each of the 8 disks? > > Old disk: Seagate ST3600057SS 3.5'' > New disk: Seagate ST600MP0006 2.5'' > > One huge virtual disk, 3271G
