[Bug 1468897] Re: multipath creates binding for Removable(USB) drives

[Mike Rushton]

Updated information. It seems the issue only comes about with USB 3.0
devices. USB 2.0 devices do not get lumped in with multipath upon
detection.

dmesg output from inserting a USB 3.0 device and then a USB 3.0 device.
Both into USB 3.0 ports:

[  223.050845] usb 4-4: new SuperSpeed USB device number 3 using xhci_hcd
[  223.069996] usb 4-4: New USB device found, idVendor=125f, idProduct=312b
[  223.070000] usb 4-4: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  223.070004] usb 4-4: Product: ADATA USB Flash Drive
[  223.070006] usb 4-4: Manufacturer: ADATA
[  223.070009] usb 4-4: SerialNumber: 0000000000000454
[  223.070589] usb-storage 4-4:1.0: USB Mass Storage device detected
[  223.071125] scsi4 : usb-storage 4-4:1.0
[  224.071718] scsi 4:0:0:0: Direct-Access     ADATA    USB Flash Drive  1.00 PQ: 0 ANSI: 6
[  224.073117] sd 4:0:0:0: Attached scsi generic sg32 type 0
[  224.073458] sd 4:0:0:0: [sdi] 30869504 512-byte logical blocks: (15.8 GB/14.7 GiB)
[  224.073729] sd 4:0:0:0: [sdi] Write Protect is off
[  224.073737] sd 4:0:0:0: [sdi] Mode Sense: 23 00 00 00
[  224.073992] sd 4:0:0:0: [sdi] Write cache: disabled, read cache: disabled, doesn't support DPO or FUA
[  224.079661]  sdi: sdi1
[  224.080909] sd 4:0:0:0: [sdi] Attached SCSI removable disk
[  224.675188] usb 3-3: new high-speed USB device number 3 using xhci_hcd
[  224.810797] usb 3-3: New USB device found, idVendor=13fe, idProduct=3600
[  224.810802] usb 3-3: New USB device strings: Mfr=1, Product=2, SerialNumber=3
[  224.810805] usb 3-3: Product: MKNUFDPR2GB
[  224.810807] usb 3-3: Manufacturer: MUSHKIN
[  224.810810] usb 3-3: SerialNumber: 07C10403C8956553
[  224.811540] usb-storage 3-3:1.0: USB Mass Storage device detected
[  224.812218] usb-storage 3-3:1.0: Quirks match for vid 13fe pid 3600: 4000
[  224.812419] scsi5 : usb-storage 3-3:1.0
[  225.841184] scsi 5:0:0:0: Direct-Access     MUSHKIN  MKNUFDPR2GB      PMAP PQ: 0 ANSI: 0 CCS
[  225.842314] sd 5:0:0:0: Attached scsi generic sg33 type 0
[  226.527048] sd 5:0:0:0: [sdj] 3911680 512-byte logical blocks: (2.00 GB/1.86 GiB)
[  226.527209] sd 5:0:0:0: [sdj] Write Protect is off
[  226.527213] sd 5:0:0:0: [sdj] Mode Sense: 23 00 00 00
[  226.527363] sd 5:0:0:0: [sdj] No Caching mode page found
[  226.527442] sd 5:0:0:0: [sdj] Assuming drive cache: write through
[  226.560690]  sdj: sdj1
[  226.562590] sd 5:0:0:0: [sdj] Attached SCSI removable disk


lsblk for relevant devices:
	
sdi                        8:128  1  14.7G  0 disk  
├─sdi1                     8:129  1  14.7G  0 part  
└─mpath4 (dm-8)          252:8    0  14.7G  0 mpath 
  └─mpath4-part1 (dm-10) 252:10   0  14.7G  0 part  
sdj                        8:144  1   1.9G  0 disk  
└─sdj1                     8:145  1   1.9G  0 part

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Title:
  multipath creates binding for Removable(USB) drives

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