CRITICAL: Missing 1 of 4 devices | 'raid level'=5 'size in blocks'=1465151808 'num devices'=4 'num failed devices'=0;;1;0;4 'num spare devices'=0;;;0;4 'device 0: sda1'=0 'device 1: sdb1'=1 'device 2: sdd1'=2