May 2024
Intermediate
248 pages
6h 59m
Japanese
Content preview from 図解まるわかり 仮想化のしくみ
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SLA（Service Level Agreement）とは、クラウドベンダーと利用者の間
でサービスの品質、可用性、性能などについて明文化し、契約上で合意し
たものです。各クラウドベンダーは、提供するサービスによって異なる
SLAを設定しています。SLAは、「サービスの定義」、「サービスレベル」、
「サービスに対するコスト」から構成されています（図10-13）。
まずはSLA 対象のサービスを定義します。サービス全部が SLA 対象では
ないので注意が必要です。例えば、単一インスタンス構成のAWS RDSは
SLA対象外とされています。
次に、サービスレベルについて提示されたSLA を確認して利用するサー
ビスが構築したいサービスの稼働率と整合性が取れているかを確認しま
す。SLA指標として、稼働率、遅延時間、障害から復旧までの時間がよく
利用されています。サービス構成によってSLA が変わります。例えば、単
一構成のEC2インスタンスのSLAは稼働率 99.5%ですが、マルチアベラビ
リティゾーン構成の方は99.99% になります。
最後にサービスレベルに対するコストについて、一般的には高いSLA を
求めれば求めるほどコストがかかります。システムの特性に合わせて適切
なSLA を持つサービスを選ぶ必要があります。
SLAが満たされない場合、利用者から申告しなければ返金がされないこ
と、返金対象にならない場合があること、障害の発生による経済的な損失
を請求できないことがあります。障害でデータを失ったり、システムが停 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.