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I have systems which lots of different LUNs are attached them (OS CentOs 6). this command lsblk helps me alot to find out how LUNs are partitioned and are mounted to which filesystem and information like that. when I first set them up output of lsblk is normal like:

  sda                8:128    0  20.2T  0 disk
  └─mpathb (dm-1)    253:3    0  20.2T  0 mpath
  ├─mpathbp1 (dm-12) 253:19   0   9.9T  0 part  /data1
  └─mpathbp2 (dm-13) 253:20   0   9.9T  0 part  /data2  

but after a while is like:

 sda                    8:80   0  20.2T  0 disk
 ├─sda1                 8:81   0  9.9T   0 part
 └─sda2                 8:82   0  9.9T   0 part
 sdm                    8:192  0  20.2T  0 disk
 ├─sdm1                 8:193  0    10T  0 part
 └─sdm2                 8:194  0  10.2T  0 part
 sdn                    8:208  0    22T  0 disk
 ├─sdn1                 8:209  0    11T  0 part
 └─sdn2                 8:210  0    11T  0 part  

why this happens and how can i fix it?

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