Tag Archives: downtime

Google 的 Cloud Spanner

Google 把 Cloud Spanner 這個服務拿出來賣了:「Introducing Cloud Spanner: a global database service for mission-critical applications」,以及說明的「Inside Cloud Spanner and the CAP Theorem」。 Cloud Spanner 的規劃上是希望有 RDBMS 的能力 (像是 ACID 特性),又有強大的擴充能力 (scalability) 與可用性 (availability): Today, we’re excited to announce the public beta for … Continue reading

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AWS CodeDeploy 支援 BlueGreenDeployment

AWS CodeDeploy 推出了 BlueGreenDeployment 的功能:「AWS CodeDeploy Introduces Blue/Green Deployments」。 BlueGreenDeployment 的目的不計成本想辦法把上線的 downtime 壓到最低,而且當出問題時 rollback 的時間壓到最低的方法: One of the challenges with automating deployment is the cut-over itself, taking software from the final stage of testing to live production. You usually need … Continue reading

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服務當掉後的偵測

CNN 這篇「Netflix goes down. Twitter blows up」提到了昨天 Netflix 當了好幾個小時的情況。裡面提到了 Down Detector 這個服務: Downdetector -- which monitors outage complaints online -- reported more than 13,000 posts from users all over the world Saturday afternoon. 到 Down Detector 網站上看,這個服務有一部份是從 social network 上挖資料: … Continue reading

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第一次看到 Twitter 這樣死的...

還... 蠻少見的?

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機房斷線最常見的肇因:UPS

UPS 反而是機房斷線最常見的肇因:「Survey: UPS Issues Are Top Cause of Outages」。 這是美國機房的調查,取樣則是從「歸咎於機房的問題」中的 453 件分析,原因包括了: UPS battery failure (65 percent) Exceeding UPS capacity (53 percent) Accidental emergency power off (EPO)/human error (51 percent) UPS equipment failure (49 percent) 應該是多選吧?不然超過 100% 了?

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