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RAID failing


I need an advise if possible for you guys. One of my servers is showing following:

# cat /proc/mdstat
Personalities : [raid1]
md0 : active raid1 sda1[0] sdb1[1]
      255936 blocks super 1.0 [2/2] [UU]
md1 : active raid1 sda2[0]
      976373760 blocks super 1.1 [2/1] [U_]
      bitmap: 5/8 pages [20KB], 65536KB chunk

unused devices: <none>

I can see the md1 is running on one drive only and this is the one where all the data resides.

This seems risky to me. Can the other drive be added without a risk and reboot/downtime? This is a production server.
LinuxLinux DistributionsStorageRAID

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8/22/2022 - Mon