There's a quote I found interesting that hasn't been noted here yet:
"This required the time-consuming process of physically relocating excess server capacity from across the US East Region and installing that capacity into the degraded EBS cluster."
And if I read this description of the re-mirror storm correctly, I think that implies Amazon had to increase the size of it's EBS cluster in the affected zone by 13%, which considering the timeline seems fairly impressive.
"This required the time-consuming process of physically relocating excess server capacity from across the US East Region and installing that capacity into the degraded EBS cluster."
And if I read this description of the re-mirror storm correctly, I think that implies Amazon had to increase the size of it's EBS cluster in the affected zone by 13%, which considering the timeline seems fairly impressive.