@setq I am using the V1.2 sata hat
Here are my hdparm values
pi@raspberrypi:~ $ sudo hdparm -Tt /dev/sda /dev/sda
/dev/sda:
Timing cached reads: 1746 MB in 2.00 seconds = 872.78 MB/sec
Timing buffered disk reads: 324 MB in 3.02 seconds = 107.40 MB/sec
/dev/sda:
Timing cached reads: 1738 MB in 2.00 seconds = 868.76 MB/sec
Timing buffered disk reads: 324 MB in 3.01 seconds = 107.59 MB/sec
pi@raspberrypi:~ $ sudo hdparm -Tt /dev/sdb /dev/sdb
/dev/sdb:
Timing cached reads: 1742 MB in 2.00 seconds = 870.98 MB/sec
Timing buffered disk reads: 346 MB in 3.01 seconds = 115.03 MB/sec
/dev/sdb:
Timing cached reads: 1730 MB in 2.00 seconds = 865.02 MB/sec
Timing buffered disk reads: 334 MB in 3.00 seconds = 111.33 MB/sec
pi@raspberrypi:~ $ sudo hdparm -Tt /dev/sdc /dev/sdc
/dev/sdc:
Timing cached reads: 1742 MB in 2.00 seconds = 871.26 MB/sec
Timing buffered disk reads: 344 MB in 3.01 seconds = 114.32 MB/sec
/dev/sdc:
Timing cached reads: 1708 MB in 2.00 seconds = 854.14 MB/sec
Timing buffered disk reads: 346 MB in 3.02 seconds = 114.68 MB/sec
pi@raspberrypi:~ $ sudo hdparm -Tt /dev/sdd /dev/sdd
/dev/sdd:
Timing cached reads: 1754 MB in 2.00 seconds = 877.25 MB/sec
Timing buffered disk reads: 156 MB in 3.01 seconds = 51.82 MB/sec
/dev/sdd:
Timing cached reads: 1752 MB in 2.00 seconds = 876.06 MB/sec
Timing buffered disk reads: 152 MB in 3.03 seconds = 50.15 MB/sec
Keep this in mind, that this is with UAS disabled. However I have noticed something, when creating the RAID using mdadm, it would slow done after a while
Personalities : [raid6] [raid5] [raid4] [raid1]
md0 : active raid5 sdd[4] sdc[2] sdb[1] sda[0]
2929890816 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/3] [UUU_]
[>....................] recovery = 0.8% (8082236/976630272) finish=823.9min speed=19591K/sec
bitmap: 0/8 pages [0KB], 65536KB chunk
unused devices: <none>
I wonder if this is software fault
