====Managing software raid1 with gmirror====

===Description===
gmirror is a tool for creating / managing software raid 1 under FreeBSD >= 5.3.


===Requirements===
FreeBSD 5.3 or more with geom compiled in. (or with module)

===Usefull commands===

^ Task ^ Command ^
| Load gmirror modules | kldload geom_mirror |
| Create a new gmirror | gmirror label -v -b split -s 2048 gm0 da0 da1|
| Verify gmirror status | gmirror status |
| List gmirrors | gmirror list |

===Disk Failure===
If a disk fails, you should replace the disk and tell gmirror to resync the array.
First, you'll need to __identify the faulty disk__:

<code>
#> gmirror status
#> gmirror list
</code>

Then, you should stop the FreeBSD host, and replace the faulty disk.
Once the disks is changed, restart the host.

Now, you should reintegrate the new disk to the array:

(note: **you should replace ad0 and gm0 with correct values you've identified before**)

<code>
#> gmirror remove gm0 ad0
#> gmirror insert gm0 ad0
</code>

Now, enjoy reconstruction !

You could get informed on __sync status__:

<code>
#> gmirror status
</code>