Можно ли ускорить софтовый RAID 5 ?

root@fserver:~# hdparm -Tt /dev/sdb

/dev/sdb:
 Timing cached reads:   2472 MB in  2.00 seconds = 1236.43 MB/sec
 Timing buffered disk reads: 292 MB in  3.00 seconds =  97.33 MB/sec
root@fserver:~# hdparm -Tt /dev/sdc

/dev/sdc:
 Timing cached reads:   2478 MB in  2.00 seconds = 1239.09 MB/sec
 Timing buffered disk reads: 320 MB in  3.00 seconds = 106.60 MB/sec
root@fserver:~# hdparm -Tt /dev/sdd

/dev/sdd:
 Timing cached reads:   2466 MB in  2.00 seconds = 1233.49 MB/sec
 Timing buffered disk reads: 308 MB in  3.01 seconds = 102.43 MB/sec

Timing buffered disk reads: 294 MB in  3.01 seconds =  97.73 MB/sec

Timing buffered disk reads: 292 MB in  3.00 seconds =  97.33 MB/sec

Welcome to Ubuntu 16.04.6 LTS (GNU/Linux 4.4.0-166-generic x86_64)
Last login: Fri Nov  1 11:39:42 2019 

root@fserver:~# hdparm -Tt /dev/md0
/dev/md0:
 Timing cached reads:   18758 MB in  1.99 seconds = 9409.16 MB/sec
 Timing buffered disk reads: 1010 MB in  3.00 seconds = 336.61 MB/sec
 
 
 root@fserver:~# hdparm -Tt /dev/sdb
/dev/sdb:
 Timing cached reads:   17818 MB in  1.99 seconds = 8936.85 MB/sec
 Timing buffered disk reads: 560 MB in  3.00 seconds = 186.55 MB/sec
 
 root@fserver:~# hdparm -Tt /dev/sdc
/dev/sdc:
 Timing cached reads:   17562 MB in  1.99 seconds = 8812.09 MB/sec
 Timing buffered disk reads: 284 MB in  3.01 seconds =  94.47 MB/sec
  
 root@fserver:~# hdparm -Tt /dev/sdd
/dev/sdd:
 Timing cached reads:   19474 MB in  1.99 seconds = 9769.81 MB/sec
 Timing buffered disk reads: 618 MB in  3.00 seconds = 205.67 MB/sec