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为什么只有2个Snapshot副本用于SCSQL日志备份?

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适用场景

适用于Microsoft SQL Server的SnapCenter插件(SCSQL)

问题解答

这是因为 SCSQL日志备份所保留的任何数量的备份文件(TRB文件)仅包含2个Snapshot副本。

示例:

  1. 假设一个卷上有4代备份文件(TRB文件):A、B、C和D。
    如果SCSQL在这种状态下创建Snapshot (snapshot1)、则snapshot1将包含 4代的日志备份。
  2. 接下来、如果创建了日志备份E并 删除了日志备份A、则卷将包含4代B、C、D和E
    。如果 在这种状态下、SCSQL创建了另一个Snapshot (snapshot2)、则snapshot2还将包含这4 代的日志备份。

概括地说:

  • snapshot1包含A、B、C和D的备份文件
  • snapshot2包含B、C、D和E的备份文件

这意味着、只有2个Snapshot副本 可以保留总共5代的日志备份。

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