Not all drives listed in lsusb

Hi all,

I have 4 x 2 TB drives connected to SATA HAT powered by 12V 5A 60W power adapter. Drives are seen correctly and I already configured a working RAID 5 array.

pi@nas-pi:~ $ lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT
sda 8:0 0 1.8T 0 disk
└─sda1 8:1 0 1.8T 0 part
└─md0 9:0 0 5.5T 0 raid5 /media/raid
sdb 8:16 0 1.8T 0 disk
└─sdb1 8:17 0 1.8T 0 part
└─md0 9:0 0 5.5T 0 raid5 /media/raid
sdc 8:32 0 1.8T 0 disk
└─sdc1 8:33 0 1.8T 0 part
└─md0 9:0 0 5.5T 0 raid5 /media/raid
sdd 8:48 0 1.8T 0 disk
└─sdd1 8:49 0 1.8T 0 part
└─md0 9:0 0 5.5T 0 raid5 /media/raid
mmcblk0 179:0 0 59.6G 0 disk
├─mmcblk0p1 179:1 0 256M 0 part /boot
└─mmcblk0p2 179:2 0 59.4G 0 part /

I am getting slow write speeds (around 40-50 MB/s)

pi@nas-pi : ~ $ dd if=/dev/zero of=/media/raid/test-write bs=1M count=5120
5120+0 records in
5120+0 records out
5368709120 bytes (5.4 GB, 5.0 GiB) copied, 120.856 s, 44.4 MB/s

Reading some posts I was trying to disable UAS for the drives. I have 3 WD drives and 1 Seagate (this is a test will be updating drives to WD RED).
The problem is that lsusb only show two drives

pi@nas-pi : ~ $ lsusb
Bus 002 Device 002: ID 1058:0a10 Western Digital Technologies, Inc.
Bus 002 Device 003: ID 1058:0a10 Western Digital Technologies, Inc.
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 001 Device 002: ID 2109:3431 VIA Labs, Inc. Hub
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

Is there a way to find the unshown drives without need to disconnect and reconnect them? I need to find VendorIDs to disable UAS.

As already said drives are all working fine and RAID configured correctly.

pi@nas-pi : ~ $ cat /proc/mdstat
Personalities : [raid6] [raid5] [raid4]
md0 : active raid5 sdd1[4] sdc1[2] sdb1[1] sda1[0]
5860048896 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/4] [UUUU]
bitmap: 2/15 pages [8KB], 65536KB chunk
unused devices:

Thank you

Any hints please?

Can you check the reading speed as well? Check the raid reading and single disk reading speed.

Hi Jack, thank you for your support.

Raid reading speed (/dev/md0) for a 10GB file is 60 MB/s
/dev/sda1 10 GB read is 120 MB/s
/dev/sdb1 10 GB read is 118 MB/s
/dev/sdc1 10 GB read is 130 MB/s

@albatr0ss

Your printing is normal because one USB corresponds to two hard drives.

Bus 002 Device 002: ID 1058:0a10 Western Digital Technologies, Inc.
Bus 002 Device 003: ID 1058:0a10 Western Digital Technologies, Inc.

ok, thank you setq