[Bug 824790] Re: IBM DS3400 Will Not Bring Up Second Path

[Peter Petrakis]

In an addition to the MP issues, LVM was misconfigured. We attempt
to repair this on one of the blades but the config file just wouldn't *take*.
I suspect there was something else going, especially since we didn't
even have direct access to the console and was forced to relay
directives to the customer to execute.

I set up a mock test environment to test the the filtering by
PCI device.

root at kickseed:/dev/disk/by-path# ls -l
total 0
lrwxrwxrwx 1 root root 8 2011-08-15 10:04 pci-0000:00:00.9-scsi-0:0:0:2 -> /dev/sdc
lrwxrwxrwx 1 root root 9 2011-08-15 10:04 pci-0000:00:00.9-scsi-0:0:0:2-part1 -> /dev/sdc1
lrwxrwxrwx 1 root root 8 2011-08-15 10:04 pci-0000:00:00.9-scsi-0:0:0:3 -> /dev/sdd
lrwxrwxrwx 1 root root 9 2011-08-15 10:04 pci-0000:00:00.9-scsi-0:0:0:3-part1 -> /dev/sdd1
lrwxrwxrwx 1 root root 8 2011-08-15 10:02 pci-0000:00:1f.2-scsi-0:0:0:0 -> /dev/sda
lrwxrwxrwx 1 root root 9 2011-08-15 10:03 pci-0000:00:1f.2-scsi-0:0:0:0-part1 -> /dev/sda1
lrwxrwxrwx 1 root root 8 2011-08-15 10:03 pci-0000:00:1f.2-scsi-0:0:0:1 -> /dev/sdb
lrwxrwxrwx 1 root root 9 2011-08-15 10:03 pci-0000:00:1f.2-scsi-0:0:0:1-part1 -> /dev/sdb1

Then, I commented out the existing "filter" directive on /etc/lvm/lvm.conf and tested:
    filter = ["a|/dev/disk/by-path/pci-0000:00:00.9-scsi.*|", "r/.*/" ]

and

    filter = ["a|/dev/disk/by-path/pci-0000:00:1f.2-scsi.*|", "r/.*/" ]

lvmdiskscan confirms the filter directives.

root at kickseed:/dev/disk/by-path# lvmdiskscan 
  /dev/disk/by-path/pci-0000:00:1f.2-scsi-0:0:0:0-part1 [       7.45 GiB] 
  /dev/disk/by-path/pci-0000:00:1f.2-scsi-0:0:0:1-part1 [      10.00 GiB] 
  0 disks
  2 partitions
  0 LVM physical volume whole disks
  0 LVM physical volumes

root at kickseed:/dev/disk/by-path# lvmdiskscan 
  /dev/disk/by-path/pci-0000:00:00.9-scsi-0:0:0:2-part1 [      10.00 GiB] 
  /dev/disk/by-path/pci-0000:00:00.9-scsi-0:0:0:3-part1 [      10.00 GiB] 
  0 disks
  2 partitions
  0 LVM physical volume whole disks
  0 LVM physical volumes

I'm going to leave this part of the effort to customer support. There are
no bugs in LVM filtering, simply execution issues.

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https://bugs.launchpad.net/bugs/824790

Title:
   IBM DS3400 Will Not Bring Up Second Path

Status in “multipath-tools” package in Ubuntu:
  Confirmed

Bug description:
  System configuration is an IBM HS21 blade connected to an IBM DS3400 SAN.
  The system is running Ubuntu 10.10 with multipath-tools version: 0.4.8-14ubuntu4.10.10.2
  The Ubuntu OS is installed on an internal disk and not the SAN.

  multipathd> show paths 
  hcil dev dev_t pri dm_st chk_st next_check 
  0:0:0:0 sda 8:0 0 [undef][ghost] [orphan] 
  1:0:0:0 sdb 8:16 3 [undef][ready] [orphan] 
  2:1:1:0 sdc 8:32 1 [undef][ready] [orphan] 

  It appears everything is working but multipathd cant define the maps,
  a multipath -v 6 shows

  "360080e50001b5f4c00003d284e37e864: domap (0) failure for
  create/reload map"

  That is the uuid of the path associated with /sda and /sdb but it cant
  seem to create it.

  libdevmapper: ioctl/libdm-iface.c(1740): dm reload 360080e50001b5f4c00003d284e37e864 OF [16384] 
  libdevmapper: ioctl/libdm-iface.c(1757): device-mapper: reload ioctl failed: Invalid argument 
  libdevmapper: ioctl/libdm-iface.c(1740): dm remove 360080e50001b5f4c00003d284e37e864 NF [16384] 
  libdevmapper: libdm-common.c(799): 360080e50001b5f4c00003d284e37e864: Stacking NODE_DEL (replaces other stacked ops) 
  libdevmapper: ioctl/libdm-iface.c(1740): dm info 360080e50001b5f4c00003d284e37e864 NF [16384] 
  360080e50001b5f4c00003d284e37e864: domap (0) failure for create/reload map 
  360080e50001b5f4c00003d284e37e864: remove multipath map 
  sda: orphaned 
  sdb: orphaned

  The SAN is on devices sda and sdb.  The internal root disk is sdc.
  The device sda is reporting I/O errors in syslog because multipath
  cannot bring up the path.

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