In our testing, md raid10 is about 30% faster than megaraid's internal raid10.
+First, let's test original configuration. It 6*1T disks and one SSD before and after bios update.
+
+root@lib24:~# lsblk --scsi -m
+NAME HCTL TYPE VENDOR MODEL REV TRAN NAME SIZE OWNER GROUP MODE
+sdb 0:0:7:0 disk ATA INTEL SSDSC2BW24 DC32 sdb 223.6G root disk brw-rw----
+sdc 0:2:0:0 disk DELL PERC H310 2.12 sdc 2.7T root disk brw-rw----
+
+root@lib24:~# dmidecode | grep 'BIOS Rev'
+ BIOS Revision: 2.5
+
+root@lib24:~# hdparm -tT /dev/sd[bc]
+
+/dev/sdb:
+ Timing cached reads: 13750 MB in 2.00 seconds = 6890.40 MB/sec
+ Timing buffered disk reads: 950 MB in 3.00 seconds = 316.44 MB/sec
+
+/dev/sdc:
+ Timing cached reads: 13304 MB in 1.99 seconds = 6670.01 MB/sec
+ Timing buffered disk reads: 1332 MB in 3.00 seconds = 443.81 MB/sec
+
+
+
+root@lib24:~# dmidecode | grep 'BIOS Rev'
+ BIOS Revision: 2.7
+root@lib24:~# lsblk --scsi -m
+NAME HCTL TYPE VENDOR MODEL REV TRAN NAME SIZE OWNER GROUP MODE
+sda 0:0:6:0 disk ATA WDC WD1002FBYS-1 0C12 sda 931.5G root disk brw-rw----
+sdb 0:0:7:0 disk ATA INTEL SSDSC2BW24 DC32 sdb 223.6G root disk brw-rw----
+sdc 0:2:0:0 disk DELL PERC H310 2.12 sdc 2.7T root disk brw-rw----
+root@lib24:~# hdparm -tT /dev/sd[abc]
+
+/dev/sda:
+ Timing cached reads: 13960 MB in 1.99 seconds = 7002.59 MB/sec
+ Timing buffered disk reads: 320 MB in 3.00 seconds = 106.57 MB/sec
+
+/dev/sdb:
+ Timing cached reads: 14004 MB in 1.99 seconds = 7024.47 MB/sec
+ Timing buffered disk reads: 962 MB in 3.00 seconds = 320.66 MB/sec
+
+/dev/sdc:
+ Timing cached reads: 13920 MB in 1.99 seconds = 6981.76 MB/sec
+ Timing buffered disk reads: 1356 MB in 3.00 seconds = 451.81 MB/sec
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Here are steps to replace hardware megaraid with software md5 on ganeti.