Hardware mirroring

Another solution is to use hardware mirroring such as redundant array of inexpensive disks (RAID). An advantage of this type of hardware mirroring is that it requires less disk space than database server mirroring does to store the same amount of data to prevent media failure.

Some hardware mirroring systems support hot swapping. You can swap a bad disk while keeping the database server online. Reducing I/O activity before performing a hot swap is recommended.
Important: If problems occur with the database server while using hardware mirroring, see the operating-system or disk documentation or technical support for assistance.

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