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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https://bugs.launchpad.net/bugs/1468897
Title:
multipath creates binding for Removable(USB) drives
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