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Old 02-05-2014, 10:35 AM   #1
czezz
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Registered: Nov 2004
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HP P2000MSA storage and multi-plated disks in system


I have connected HP P2000MSA storage with 2 Volumes created there.
My operating system is installed on internel disk: /dev/sda (1 and 2) with LVM.

Disks: /dev/sdb and /dev/sdc should represent 2 of volumes form HP storage.
However, I see that these disks somehow are duplicated/multiplated up to /dev/sdh and /dev/sdi
Code:
# cat /proc/partitions
major minor  #blocks  name

   7        0     466902 loop0
   7        1    3505526 loop1
   8        0  143338560 sda
   8        1     512000 sda1
   8        2  142825472 sda2
   8       16  117773248 sdb
   8       17  117187424 sdb1
   8       32 1052864320 sdc
   8       33 1052864288 sdc1
 253        0   48357376 dm-0
 253        1    6086656 dm-1
   8       48  117773248 sdd
   8       49  117187424 sdd1
   8       64 1052864320 sde
   8       65 1052864288 sde1
   8       80  117773248 sdf
   8       81  117187424 sdf1
   8       96 1052864320 sdg
   8       97 1052864288 sdg1
   8      112  117773248 sdh
   8      113  117187424 sdh1
   8      128 1052864320 sdi
   8      129 1052864288 sdi1
 253        2  125829120 dm-2
 253        3 1043333120 dm-3
 253        4   14962688 dm-4
 253        5    3829760 dm-5
Moreover, I can see that on /dev/sdh and /dev/sdi LVM is created and pvdisplay shows error Found duplicate.
Code:
# pvdisplay
  Found duplicate PV KaaJPqfxn4UgSIqGfbgz5YJ1v8RPEdJX: using /dev/sdd1 not /dev/sdb1
  Found duplicate PV 13W4gMClc22VXmAVCbLcVhBvORQl9ESC: using /dev/sde1 not /dev/sdc1
  Found duplicate PV KaaJPqfxn4UgSIqGfbgz5YJ1v8RPEdJX: using /dev/sdf1 not /dev/sdd1
  Found duplicate PV 13W4gMClc22VXmAVCbLcVhBvORQl9ESC: using /dev/sdg1 not /dev/sde1
  Found duplicate PV KaaJPqfxn4UgSIqGfbgz5YJ1v8RPEdJX: using /dev/sdh1 not /dev/sdf1
  Found duplicate PV 13W4gMClc22VXmAVCbLcVhBvORQl9ESC: using /dev/sdi1 not /dev/sdg1
  --- Physical volume ---
  PV Name               /dev/sdh1
  VG Name               MVolGroup
  PV Size               111.76 GiB / not usable 4.84 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              28609
  Free PE               215
  Allocated PE          28394
  PV UUID               KaaJPq-fxn4-UgSI-qGfb-gz5Y-J1v8-RPEdJX

  --- Physical volume ---
  PV Name               /dev/sdi1
  VG Name               MVolGroup
  PV Size               1004.09 GiB / not usable 3.78 MiB
  Allocatable           yes (but full)
  PE Size               4.00 MiB
  Total PE              257046
  Free PE               0
  Allocated PE          257046
  PV UUID               13W4gM-Clc2-2VXm-AVCb-LcVh-BvOR-Ql9ESC

  --- Physical volume ---
  PV Name               /dev/sda2
  VG Name               VolGroup
  PV Size               136.21 GiB / not usable 2.00 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              34869
  Free PE               16989
  Allocated PE          17880
  PV UUID               ehgbC1-QeZW-4AFf-OmAv-cQam-uMbi-3XKYxl
I want to correct problem, but I cant understand why do I see so many disks. I would expect to see only /dev/sdb and /dev/sdc (as a HP storage)

Last edited by czezz; 02-05-2014 at 03:00 PM.
 
Old 02-06-2014, 11:08 AM   #2
grim76
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Registered: Jun 2007
Distribution: Debian, SLES, Ubuntu
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Looks like you have multiple paths to the devices.

What I have done in the past with this is configure multipath for proper use (depends on your storage vendor). Configure LVM (lvm.conf) to point to the multipathed devices.
 
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