The rule change will require merchants to gain cardholder approval at the conclusion of the trial before they start billing. To help cardholders with that decision, merchants will be required to send the cardholder – either by email or text – the transaction amount, payment date, merchant name along with explicit instructions on how to cancel a trial.
Historically, AWS has maximized customer savings by applying credits and RI discounts first to the account that owned the credit or RI lease and then distributing the remainder, if any, to qualifying usage incurred by accounts in the same organization. While this approach had the potential of lowering the overall bill, customers were unable to control if, and how, discounts were applied across organizational lines.
現在則是可以關掉：
To provide greater flexibility, customers can now disable AWS credit sharing across all accounts in their organization. This ensures that only the account that owns a credit, or has previously redeemed a credit, receives the associated benefit.
也可以分開設定：
You can also designate a set of accounts for which RI discount sharing is disabled, while continuing to share RI discounts among the rest of the accounts in your organization.
10/2 開始改變 (而不是 10/1)，低消一分鐘，Windows 機種以及需要額外收費的 Linux 機種不在範圍內：
This change is effective in all AWS Regions and will be effective October 2, for all Linux instances that are newly launched or already running. Per-second billing is not currently applicable to instances running Microsoft Windows or Linux distributions that have a separate hourly charge. There is a 1 minute minimum charge per-instance.
然後 Spot 與買 RI 後也是一樣以秒計價：
List prices and Spot Market prices are still listed on a per-hour basis, but bills are calculated down to the second, as is Reserved Instance usage (you can launch, use, and terminate multiple instances within an hour and get the Reserved Instance Benefit for all of the instances).
這次改變的影響很巨大。馬上可以想到幾個情境...
第一個是對於實踐 Release early, release often 的團隊來說，如果設計成每 deploy 一次就建一個新的 AMI (最乾淨的作法)，再開新機器換掉的話，成本就會增加不少。所以對於這樣的團隊，就會偏好朝著替換現有目錄內的東西後重啟...
Note: If you currently use Consolidated Billing, your Consolidated Billing family is migrated automatically to AWS Organizations in Billing mode, which is equivalent to Consolidated Billing. All account activity charges accrued by member accounts are billed to the master account.
High performance with respect to reads and writes was achieved by using RAID0 with EBS provisioned IOPS volumes. To get more throughput per volume, 5 volumes of 4TB each were used, instead of 1 big volume. This was to facilitate faster snapshots and restores.
LVM to manage two Logical Volume’s (DB and DRBD Metadata) within single Volume Group.
