4 ms·
Pure cost comparison: Let's ignore the $0.10/GB-month vs. $0.125/GB-month storage pricing as it is negligible compared to IOP costs. Standard EBS volumes aver
by blo 14y ago
Pure cost comparison:
Let's ignore the $0.10/GB-month vs. $0.125/GB-month storage pricing as it is negligible compared to IOP costs.
Standard EBS volumes average 100 IOPS with best effort bursting.
A provisioned EBS volume at 100 IOPS would cost $0.10/IOPS-month * 100 IOPS = $10/month
A standard EBS volume cost would be $0.10/1000000 IOP (an equivalent of $0.26/IOPS-month). The breakeven with the provisioned EBS occurs at 38% utilization (38 IOPS), meaning that provisioned EBS is cheaper above this point.
To match the performance of a 4 volume standard EBS RAID (400 IOPS), you would have a minimum fixed cost of $40/month/GB, vs. the current $0.40/month/4GB + variable IOP pricing.
Provisioned EBS makes sense for scenarios with sustained high IOPS utilization as you get consistent performance with possible lower total costs. For less IO-intensive loads, using a RAID of standard volumes will be more cost-effective.
- jswanson 14y agoThe way they calculate it is a little misleading. From AWS[1]: Provisioned IOPS is charged by the amount you provision in IOPS (input/output operations per second) X the amount of days you provision for the month. If I understand the above correctly, the estimate of $10/month would actually be: $0.10 * 30 days * 100 IOPS = $300/month (In USEAST) [1] http://aws.amazon.com/ebs/ http://aws.amazon.com/ebs/
- RyanGWU82 14y agoI think you may be mistaken -- under "Projecting Costs" that page says that it's 10 cents per provisioned IOPS month.
- cperciva 14y agothe amount of days They've fixed that, it now says "the percentage of days".
- jswanson 14y agoThank you for pointing that out, and kudos to Amazon for updating their doc. They have an easy to understand sample calculation up now as well.