Some weeks ago i have a problem with my external USB-HDDisk.
This is the problem: (USB disk read and write slow, very slow) (writes start's at ~11mB/sec but after ~8sec downgrade to ~220 kB/sec)
sdb disk is one external SATA 500Gb USB-HDD connected via usb interface.
sda disk is one 8GB compact flash with the system.
My debian system:root@debian:/# hdparm -tT /dev/sdb
/dev/sdb:
Timing cached reads: 2 MB in 9.40 seconds = 217.93 kB/sec
Timing buffered disk reads: 2 MB in 9.40 seconds = 217.93 kB/sec
root@debian:/# hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 412 MB in 2.00 seconds = 206.02 MB/sec
Timing buffered disk reads: 64 MB in 3.04 seconds = 21.06 MB/sec
Dmesg drivers output seems correct:root@debian:/# uname -a
Linux debian 3.16.0-4-686-pae #1 SMP Debian 3.16.43-2+deb8u2 (2017-06-26) i686 GNU/Linux
root@debian:/# cat /proc/version
Linux version 3.16.0-4-686-pae (debian-kernel@lists.debian.org) (gcc version 4.8.4 (Debian 4.8.4-1) ) #1 SMP Debian 3.16.43-2+deb8u2 (2017-06-26)
root@debian:/# cat /etc/*version
8.8
And fstab modified lines: (500GB disk with two partitions: sdb1 400Gb and sdb2 100Gb)root@debian:/# dmesg | grep usb
[ 3.695730] usbcore: registered new interface driver usbfs
[ 3.695786] usbcore: registered new interface driver hub
[ 3.704223] usbcore: registered new device driver usb
[ 3.720330] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
[ 3.720339] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 3.720345] usb usb1: Product: EHCI Host Controller
[ 3.720351] usb usb1: Manufacturer: Linux 3.16.0-4-686-pae ehci_hcd
[ 3.720357] usb usb1: SerialNumber: 0000:00:03.3
[ 3.778282] usb usb2: New USB device found, idVendor=1d6b, idProduct=0001
[ 3.778298] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 3.778305] usb usb2: Product: OHCI PCI host controller
[ 3.778311] usb usb2: Manufacturer: Linux 3.16.0-4-686-pae ohci_hcd
[ 3.778317] usb usb2: SerialNumber: 0000:00:03.0
[ 3.854147] usb usb3: New USB device found, idVendor=1d6b, idProduct=0001
[ 3.854163] usb usb3: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 3.854170] usb usb3: Product: OHCI PCI host controller
[ 3.854176] usb usb3: Manufacturer: Linux 3.16.0-4-686-pae ohci_hcd
[ 3.854181] usb usb3: SerialNumber: 0000:00:03.1
[ 4.032074] usb 1-3: new high-speed USB device number 2 using ehci-pci
[ 5.052166] usb 1-3: New USB device found, idVendor=1bcf, idProduct=0c31
[ 5.052181] usb 1-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[ 5.052188] usb 1-3: Product: USB to Serial-ATA bridge
[ 5.052194] usb 1-3: Manufacturer: Sunplus Innovation Technology
[ 5.052200] usb 1-3: SerialNumber: FFFFFBA0FF0000000000012FFC6C6F
[ 6.514227] usb-storage 1-3:1.0: USB Mass Storage device detected
[ 6.540187] scsi2 : usb-storage 1-3:1.0
[ 6.540552] usbcore: registered new interface driver usb-storage
I have shared the disk via Samba but the transfer rates are soooo slow.UUID=4bdbbcf1-c4f2-4466-8701-21810fb42816 /var/www/html/shared ext4 defaults,nofail 0 0
UUID=22551ed0-94b9-4339-a5db-dd2c061dc98b /media/400GB ext4 defaults,nofail 0 0
I tested some other's USB external disk's (pendrives) and all ones have same very slow transfer rates.
Please, some suggestions?