root@filer:~# cat /proc/mdstat 
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10] 
md14 : active raid0 md3[0] md13[10] md12[9] md11[8] md10[7] md9[6] md8[5] md7[4] md6[3] md5[2] md4[1]
      8058544384 blocks 256k chunks
      
md13 : active raid5 sdaq[0] sdat[3] sdas[2] sdar[1]
      732595200 blocks level 5, 256k chunk, algorithm 2 [4/4] [UUUU]
      
md12 : active raid5 sdam[0] sdap[3] sdao[2] sdan[1]
      732595200 blocks level 5, 256k chunk, algorithm 2 [4/4] [UUUU]
      
md11 : active raid5 sdai[0] sdal[3] sdak[2] sdaj[1]
      732595200 blocks level 5, 256k chunk, algorithm 2 [4/4] [UUUU]
      
md10 : active raid5 sdae[0] sdah[3] sdag[2] sdaf[1]
      732595200 blocks level 5, 256k chunk, algorithm 2 [4/4] [UUUU]
      
md9 : active raid5 sdz[0] sdad[3] sdab[2] sdaa[1]
      732595200 blocks level 5, 256k chunk, algorithm 2 [4/4] [UUUU]
      
md8 : active raid5 sdu[0] sdx[3] sdw[2] sdv[1]
      732595200 blocks level 5, 256k chunk, algorithm 2 [4/4] [UUUU]
      
md7 : active raid5 sdq[0] sdt[3] sds[2] sdr[1]
      732595200 blocks level 5, 256k chunk, algorithm 2 [4/4] [UUUU]
      
md6 : active raid5 sdm[0] sdp[3] sdo[2] sdn[1]
      732595200 blocks level 5, 256k chunk, algorithm 2 [4/4] [UUUU]
      
md5 : active raid5 sdi[0] sdl[3] sdk[2] sdj[1]
      732595200 blocks level 5, 256k chunk, algorithm 2 [4/4] [UUUU]
      
md4 : active raid5 sde[0] sdh[3] sdg[2] sdf[1]
      732595200 blocks level 5, 256k chunk, algorithm 2 [4/4] [UUUU]
      
md3 : active raid5 sda[0] sdd[3] sdc[2] sdb[1]
      732595200 blocks level 5, 256k chunk, algorithm 2 [4/4] [UUUU]
      
md2 : active raid1 sdy3[0] sdac3[1]
      241264064 blocks [2/2] [UU]
      
md1 : active raid1 sdy2[0] sdac2[1]
      1951808 blocks [2/2] [UU]
      
md0 : active raid1 sdy1[0] sdac1[1]
      979840 blocks [2/2] [UU]
      
unused devices: <none>