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technology/bsd/gmirror.md

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+---
+obj: filesystem
+---
+# gmirror
+The gmirror utility is used for mirror ([RAID](../linux/filesystems/RAID.md)-1) configurations on [FreeBSD](FreeBSD.md).  After a mirror's creation, all components are detected and configured automatically.  All operations like failure detection, stale component detection, rebuild of stale components, etc. are also	done automatically.  The gmirror utility uses on-disk metadata (stored in the provider's last sector) to store all needed information.  Since the last sector is used for this purpose, it is possible to place a root file system on a mirror.
+
+## Usage
+- Automatic Creation
+```shell
+gmirror label [-Fhnv] [-b balance] [-s slice] name prov ...
+```
+
+- Remove a device
+```shell
+gmirror forget [-v] name ... # Forget disconnected devices
+gmirror deactivate	[-v] name prov ...
+gmirror remove [-v] name prov ...
+```
+
+- Destroy Mirror
+```shell
+gmirror destroy [-fv] name	...
+```
+
+- Clear metadata on device
+```shell
+gmirror clear [-v]	prov ...
+```
+
+- Status of stripes
+```shell
+gmirror list
+gmirror status
+```