3 ms·
Assuming this blurb is accurate: " General-purpose SSD volume (gp3) provides the consistent 125 MiB/s throughput and 3000 IOPS within the price of provisioned s
by shrubble 4y ago
Assuming this blurb is accurate: " General-purpose SSD volume (gp3) provides the consistent 125 MiB/s throughput and 3000 IOPS within the price of provisioned storage. Additional IOPS (up to 16,000) and throughput (1000 MiB/s) can be provisioned with an additional price. The General-purpose SSD volume (gp2) provides 3 IOPS per GiB storage provisioned with a minimum of 100 IOPS"
... then it seems like a device that limits bandwidth either on the storage cluster or between the node and storage cluster is present. 125MiB/s is right around the speed of a 1gbit link, I believe. That it was a networking setting changed in-switch doesn't seem to be surprising.
- nonameiguess 4y agoThis would have been my guess. All EBS volumes are stored on a physical disk that supports the highest bandwidth and IOPS you can live migrate to, and the actual rates you get are determined by something in the interconnect. Live migration is thus a matter of swapping out the interconnect between the VM and the disk or even just relaxing a logical rate-limiter, without having to migrate your data to a different disk.
- prmoustache 4y agoThe actual migration is not instantaneous despite the volume being immediately reported as gp3. You get a status change to "optimizing" if my memory is correct with a percentage. And the higher the volume the longer it takes so there is definitely a sync to faster storage.