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

Tue Aug 11 20:04:23 UTC 2015

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

Status in multipath-tools package in Ubuntu:
  Fix Released
Status in multipath-tools source package in Trusty:
  In Progress

Bug description:
  On a system with a multipath configuration, multipath bindings are
  being created for removable(USB) drives rendering them inaccessible as
  normal removable drives.

  in this case, the usb drive is detected as /dev/sdi:

  # lsblk|grep -A2 sdi
  sdi                        8:128  1  14.7G  0 disk  
  ├─sdi1                     8:129  1  14.7G  0 part  
  └─mpath4 (dm-9)          252:9    0  14.7G  0 mpath 
    └─mpath4-part1 (dm-10) 252:10   0  14.7G  0 part  

  # cat /etc/multipath/bindings 
  # This file was created by curtin while installing the system.
  mpath0 1IBM     IPR-0   5EC2590000000080
  # End of content generated by curtin.
  # Everything below is maintained by multipath subsystem.
  mpath1 1IBM     IPR-0   5EC2590000000060
  mpath2 1IBM     IPR-0   5EC2590000000040
  mpath3 1IBM     IPR-0   5EC2590000000020
  mpath4 1ADATA   USB Flash Drive 

  Upon trying to format /dev/sdi1:

  # mkfs.ext4 /dev/sdi1
  mke2fs 1.42.9 (4-Feb-2014)
  /dev/sdi1 is apparently in use by the system; will not make a filesystem here!

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: multipath-tools 0.4.9-3ubuntu7.2
  ProcVersionSignature: User Name 3.16.0-41.55~14.04.1-generic 3.16.7-ckt11
  Uname: Linux 3.16.0-41-generic ppc64le
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: ppc64el
  Date: Thu Jun 25 20:44:13 2015
  ProcEnviron:
   TERM=screen
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: multipath-tools
  UpgradeStatus: No upgrade log present (probably fresh install)

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