Why should one uses IO1 volume over GP3 when it is now possible to manually enter the number of IOPS desired for the GP3 volume ?

CodePudding user response：

It always depends on what your workload needs. The documentation has a nice comparison chart: EBS Volume Types: Solid state drives (SSD)

The main differences are the following:

• gp3 can scale up to 16.000 IOPS whereas io1 can scale up to 64.000 IOPS
• io1 volumes support EBS Multi-Attach and gp3 doesn't

If you need EBS Multi-Attach or more than 16k IOPS, you'll probably want to go with io1 volumes, otherwise gp3 will usually be fine.