Timeline: 11:57 (UTC+8) Storage util warning notice for Tank A. 14:05 SA selected candidates for migration to Tank B, and disabled integrity check in order to speed up. 20:27 migration finished, data in Tank A was recycled by SA. access switched to use Tank B. 20:30 IO Error.
Tencent Cloud Data Loss Incident Report (Chinese) https://mp.weixin.qq.com/s?__biz=MjM5MDgwMzc4MA==&mid=2654866071&idx=1&sn=c4db3640d433876e5861209b4b7f7fd0 …
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Root reason should be silent error from HDD propagated to the 2 other replicas. Two rule violations by SA made this worse: (1) integrity check was disabled. (2) migration source should be kept for at least 24h.
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