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Update mdadm instruction to import existing array.

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Gauthier Provost 2019-08-05 13:09:04 +08:00
parent 0cb4b28d91
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docs/mdadm.md
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@ -420,9 +420,34 @@ You can test your error notification setup by doing the following:
If for some reasons you want to add an existing array to your system (e.g you just did a new fresh install of your operating system), you can use the following command to detect your existing array.
sudo mdadm --assemble --scan
Find the array with the following command:
Then refer to previous sections to mount the file system and save its layout in mdadm configuration.
sudo mdadm --detail --scan
Output
ARRAY /dev/md/helios4:0 metadata=1.2 name=helios4:0 UUID=803a730b:7e13a859:08b9725e:c2eff9d5
We can see that an existing array has been detected as */dev/md/helios4:0* .
You might want to check directly /proc/mdstat to find the device number. This will be easier to use when configuring your mounting points.
cat /proc/mdstat
Ouput
Personalities : [raid10] [raid0] [raid1] [raid6] [raid5] [raid4]
md127 : active (auto-read-only) raid10 sdd[3] sda[0] sdc[2] sdb[1]
234323968 blocks super 1.2 512K chunks 2 near-copies [4/4] [UUUU]
bitmap: 0/2 pages [0KB], 65536KB chunk
unused devices: <none>
As we can see here the array is identified as device **md127** (/dev/md127).
Then refer to previous [section](/mdadm/#save-the-array-layout) to save the array layout in mdadm configuration and mount the file system but take in consideration that now device name is **/dev/md127** not anymore /dev/md0.
## Reset Existing RAID Devices