4 ms·
If one availability zone is down, there will be suddenly be ton of extra people trying to start new instances in the other availability zones. Could there just
by rlpb 14y ago
If one availability zone is down, there will be suddenly be ton of extra people trying to start new instances in the other availability zones. Could there just be a shortage of available instances in the other availability zones? Perhaps Amazon don't keep enough spare capacity for this eventuality (nor would I expect them to)?
- datasage 14y agoThis certainly can happen. You can't rely on being able to launch enough replacement instances if a zone fails. You can at least mitigate it by keeping utilization of your instances below what would be needed to handle load of one zone failing. I suspect to save money, many people are pushing utilization as high as possible.
- sofuture 14y agoThis is what reserved instances are for. You can by low use reserved instances for disaster planning.
- anothermachine 14y agoIf an outage in one zone causes a brownout in the other zones, then the aren't independent "availability" zones in any logical sense. They may as well be on the same power supply.
- ars 14y agoThey are independent IF you buy them in advance. If you wait till an actual outage then it's too late.