|**1800**|Enables [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] optimization when disks of different sector sizes are used for primary and secondary replica log files, in [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] Always On and Log Shipping environments. This trace flag is only required to be enabled on [!INCLUDE[ssNoVersion](../../includes/ssnoversion-md.md)] instances with transaction log file residing on disk with sector size of 512 bytes. It is **not** required to be enabled on disk with 4k sector sizes. For more information, see this [Microsoft Support article](https://support.microsoft.com/kb/3009974).<br /><br />**Note:** This trace flag applies to [!INCLUDE[ssSQL11](../../includes/sssql11-md.md)] SP1 CU13, [!INCLUDE[ssSQL11](../../includes/sssql11-md.md)] SP2 CU3, [!INCLUDE[ssSQL14](../../includes/sssql14-md.md)] RTM CU5, and higher builds.<br /><br />**Scope:** global only|
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