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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物理的な機器をまとめて使うのは、主に冗長性や性能の向上のためで
す。 コンピュータなどの機器を使用したシステムでサービスを提供する以
上、機器の故障はつきものです。故障しても利用者が同じ接続先に接続し
てサービスを提供し続けるためには、複数の機器をまとめて利用者からは
1 つに見えるようにする必要があります。また、システムの処理性能の向
上が必要になってサーバーが増えた場合にも、利用者からの接続先を1 つ
にしておくことで、利用者が意識することなく性能を高められます。まと
めて使う仮想化により、このような課題を解決できます（図1-17）。
サーバー、ネットワーク、ストレージを例にして、まとめて見せる仮想
化の例を見てみます（図1-18）。
サーバーの仮想化では負荷分散という機能により、アクセス先を負荷分
散装置の1 カ所に見せることができます。負荷分散装置の背後に複数台の
サーバーを配置し、それらを振り分けて冗長性や性能を高めます。
ネットワークの仮想化の例として、リンクアグリゲーションという機能
があります。複数のネットワーク機器のポートを束ねて1 つに見せること
で、通信帯域の拡張や冗長性の確保ができます。
ストレージの仮想化の例として、RAID（4-2 参照）と呼ばれる機能が
あります。複数のストレージを組み合わせて1 つのストレージに見せるこ
とで、信頼性や性能を向上させられます。
まとめて使う仮想化の技術により、冗長性や性能を高めることができま
す。
まとめて使う理由
まとめて使う仮想化の例
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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.