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Linux host shows more number of paths than actual

user90210
Level 2
Employee

my linux host RHEL 6.4 , has EMC Symmetrix DMX800 luns provisioned.

2 HBA ports are seeing luns on the 2 array ports , thus making it 4 paths per lun. Instead OS sees it as 36 paths.

Same luns are also assigned to another host, there i see it correctly as 4 paths.

have checked the zoning, masking several times. Reimaged the host. this has not resolved the issue.

any setting on the symmetrix?

1 ACCEPTED SOLUTION

Accepted Solutions

starflyfly
Level 6
Employee Accredited Certified

Hareware notes for disk array:

 

http://www.symantec.com/business/support/index?page=content&id=TECH47728&profileURL=https%3A%2F%2Fsymaccount-profile.symantec.com%2FSSO%2Findex.jsp%3FssoID%3D1401245807159ZKi14qZeeNwy999O88HxapwLhlaWf2oBX8p6b

View solution in original post

8 REPLIES 8

Gaurav_S
Moderator
Moderator
   VIP    Certified

Hi ,

Firstly, are you using DMP here or powerpath ? What is the SF version you are using ?

If you have 36 luns visible, you are certainly sure that luns have same serial numbers & they are indeed same luns appearing with different paths ?

If you are using DMP, have you checked if anything excluded from DMP view ?

# vxdmpadm listexclude all

# vxddladm listexclude all

For best settings & mode to be used, refer hardware technotes & SCLs below

https://sort.symantec.com/documents/doc_details/sfha/6.0/Linux/CompatibilityLists/

 

G

 

 

 

user90210
Level 2
Employee

I dont think it has to do with the type of multipathing . But no powerpath . SF - 6.1 .

36 paths all point to same lun.

 

# vxdmpadm listexclude all
Devices excluded from VxVM:
--------------------------

Paths : None

Controllers : None

VID:PID : None

--------------------------
[root@devqalin-3 ~]#

 

dmpdev          = emc0_020c
state           = enabled
enclosure       = emc0
cab-sno         = 000287971357
asl             = libvxemc.so
vid             = EMC
pid             = SYMMETRIX
array-name      = EMC
array-type      = A/A
iopolicy        = MinimumQ
avid            = 020C
lun-sno         = 570020C000
udid            = EMC%5FSYMMETRIX%5F000287971357%5F570020C000
dev-attr        = bcv Mirror
lun_type        = mirror
scsi3_vpd       = -
replicated      = no
num_paths       = 36
###path         = name state type transport ctlr hwpath aportID aportWWN attr
path            = sdeo enabled(a) - FC c4 c4 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdsg enabled(a) - FC c4 c4 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdza enabled(a) - FC c4 c4 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdvk enabled(a) - FC c4 c4 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdace enabled(a) - FC c4 c4 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdlh enabled(a) - FC c4 c4 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sden enabled(a) - FC c4 c4 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdos enabled(a) - FC c4 c4 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdhy enabled(a) - FC c4 c4 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdbe enabled(a) - FC c4 c4 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdack enabled(a) - FC c4 c4 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdvq enabled(a) - FC c4 c4 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdyu enabled(a) - FC c4 c4 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdsa enabled(a) - FC c4 c4 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdor enabled(a) - FC c4 c4 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdhx enabled(a) - FC c4 c4 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdpq enabled(a) - FC c4 c4 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdli enabled(a) - FC c4 c4 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdhz enabled(a) - FC c5 c5 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdot enabled(a) - FC c5 c5 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdbf enabled(a) - FC c5 c5 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdlk enabled(a) - FC c5 c5 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdeq enabled(a) - FC c5 c5 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdqm enabled(a) - FC c5 c5 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdaea enabled(a) - FC c5 c5 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdxg enabled(a) - FC c5 c5 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdaak enabled(a) - FC c5 c5 16d-b 50:06:04:8c:4a:86:07:7f -

path            = sdtq enabled(a) - FC c5 c5 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdlj enabled(a) - FC c5 c5 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdep enabled(a) - FC c5 c5 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdou enabled(a) - FC c5 c5 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdia enabled(a) - FC c5 c5 1d-b 50:06:04:8c:4a:86:07:70 -
path            = sdtw enabled(a) - FC c5 c5 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdaaq enabled(a) - FC c5 c5 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdadu enabled(a) - FC c5 c5 16d-b 50:06:04:8c:4a:86:07:7f -
path            = sdxa enabled(a) - FC c5 c5 16d-b 50:06:04:8c:4a:86:07:7f -

 

 

 

al_from_indiana
Level 3

Show your output of the paths from the OS

starflyfly
Level 6
Employee Accredited Certified

You can further  check:

 

1. fdisk -l

2. /etc/vx/diag.d/vxscsiinq -d  /dev/sdeo  <<<repeat for each path, check if they are same "Serial Number"

 

3. more /etc/vx/disk.info

4. clear device tree, test again:

  # mv /etc/vx/disk.info /etc/vx/disk.info.old 
# mv array.info array.info.orig
# rm /dev/vx/rdmp/*
# rm /dev/vx/dmp/*
# rm /dev/*   <<<<<all disks device file

#vxconfigd -k

5.try to restart the server, and check again?

 

starflyfly
Level 6
Employee Accredited Certified

Hareware notes for disk array:

 

http://www.symantec.com/business/support/index?page=content&id=TECH47728&profileURL=https%3A%2F%2Fsymaccount-profile.symantec.com%2FSSO%2Findex.jsp%3FssoID%3D1401245807159ZKi14qZeeNwy999O88HxapwLhlaWf2oBX8p6b

View solution in original post

user90210
Level 2
Employee

[root@devqalin-2 ~]# inq |more
Inquiry utility, Version V7.3-824 (Rev 0.0)      (SIL Version V6.4.0.0 (Edit Lev
el 824)
Copyright (C) by EMC Corporation, all rights reserved.
For help type inq -h.

...............................................................................
...............................................................................
...............................................................................
...............................................................................
...............................................................................
...............................................................................
...............................................................................
...............................................................................
...............................................................................
...............................................................................
...................

---------------------------------------------------------------------------
DEVICE           :VEND    :PROD            :REV   :SER NUM    :CAP(kb)
---------------------------------------------------------------------------
/dev/sda         :DGC     :LUNZ            :0326  :00000000   :           0
/dev/sdb         :DGC     :RAID 5          :0326  :4B0000AB   :    52428800
/dev/sdc         :DGC     :LUNZ            :0326  :00000000   :           0
/dev/sdd         :DGC     :RAID 10         :0326  :05000066   :    10485760
/dev/sde         :DGC     :RAID 10         :0326  :06000066   :    10485760
/dev/sdf         :DGC     :RAID 5          :0326  :480000AB   :    52428800
/dev/sdg         :DGC     :RAID 5          :0326  :490000AB   :    52428800
/dev/sdh         :DGC     :RAID 5          :0326  :4A0000AB   :    52428800
/dev/sdi         :DGC     :RAID 5          :0326  :4B0000AB   :    52428800
/dev/sdj         :DGC     :RAID 10         :0326  :05000066   :    10485760
/dev/sdk         :DGC     :RAID 10         :0326  :06000066   :    10485760
/dev/sdl         :DGC     :RAID 5          :0326  :480000AB   :    52428800
/dev/sdm         :DGC     :RAID 5          :0326  :490000AB   :    52428800
/dev/sdn         :DGC     :RAID 5          :0326  :4A0000AB   :    52428800
/dev/sdq         :EMC     :SYMMETRIX       :5671  :5700201000 :      459840
/dev/sdr         :EMC     :SYMMETRIX       :5671  :5700201000 :      459840
/dev/sds         :EMC     :SYMMETRIX       :5671  :5700202000 :      459840
/dev/sdt         :EMC     :SYMMETRIX       :5671  :5700202000 :      459840
/dev/sdu         :EMC     :SYMMETRIX       :5671  :5700203000 :      459840
/dev/sdv         :EMC     :SYMMETRIX       :5671  :5700203000 :      459840
/dev/sdw         :EMC     :SYMMETRIX       :5671  :5700204000 :      459840
/dev/sdx         :EMC     :SYMMETRIX       :5671  :5700204000 :      459840
/dev/sdy         :EMC     :SYMMETRIX       :5671  :5700205000 :      459840
/dev/sdz         :EMC     :SYMMETRIX       :5671  :5700205000 :      459840
/dev/sdaa        :EMC     :SYMMETRIX       :5671  :5700206000 :      459840
/dev/sdab        :EMC     :SYMMETRIX       :5671  :5700206000 :      459840
/dev/sdac        :EMC     :SYMMETRIX       :5671  :5700207000 :      459840
/dev/sdad        :EMC     :SYMMETRIX       :5671  :5700207000 :      459840
/dev/sdae        :EMC     :SYMMETRIX       :5671  :570020d000 :      459840
/dev/sdaf        :EMC     :SYMMETRIX       :5671  :570020d000 :      459840
/dev/sdag        :EMC     :SYMMETRIX       :5671  :570020e000 :      459840
/dev/sdah        :EMC     :SYMMETRIX       :5671  :570020e000 :      459840
/dev/sdai        :EMC     :SYMMETRIX       :5671  :570020f000 :      459840
/dev/sdaj        :EMC     :SYMMETRIX       :5671  :570020f000 :      459840
/dev/sdak        :EMC     :SYMMETRIX       :5671  :5700210000 :      459840
/dev/sdal        :EMC     :SYMMETRIX       :5671  :5700210000 :      459840
/dev/sdam        :EMC     :SYMMETRIX       :5671  :5700211000 :      459840
/dev/sdan        :EMC     :SYMMETRIX       :5671  :5700211000 :      459840
/dev/sdao        :EMC     :SYMMETRIX       :5671  :5700212000 :      459840
/dev/sdap        :EMC     :SYMMETRIX       :5671  :5700212000 :      459840
/dev/sdaq        :EMC     :SYMMETRIX       :5671  :5700213000 :      459840
/dev/sdar        :EMC     :SYMMETRIX       :5671  :5700213000 :      459840
/dev/sdas        :EMC     :SYMMETRIX       :5671  :5700214000 :      459840
/dev/sdat        :EMC     :SYMMETRIX       :5671  :5700214000 :      459840
/dev/sdau        :EMC     :SYMMETRIX       :5671  :5700215000 :      459840
/dev/sdav        :EMC     :SYMMETRIX       :5671  :5700215000 :      459840
/dev/sdaw        :EMC     :SYMMETRIX       :5671  :5700216000 :     2208960
/dev/sdax        :EMC     :SYMMETRIX       :5671  :5700216000 :     2208960
/dev/sday        :EMC     :SYMMETRIX       :5671  :5700217000 :     2208960
/dev/sdaz        :EMC     :SYMMETRIX       :5671  :5700217000 :     2208960
/dev/sdba        :EMC     :SYMMETRIX       :5671  :5700218000 :     2208960
/dev/sdbb        :EMC     :SYMMETRIX       :5671  :5700218000 :     2208960
/dev/sdbc        :EMC     :SYMMETRIX       :5671  :5700219000 :     2208960
/dev/sdbd        :EMC     :SYMMETRIX       :5671  :5700219000 :     2208960
/dev/sdbe        :EMC     :SYMMETRIX       :5671  :570020c000 :      459840
/dev/sdbf        :EMC     :SYMMETRIX       :5671  :570020c000 :      459840
/dev/sdbg        :DELL    :PERC 5/i        :1.03  :           :    71041024
/dev/sdbl        :EMC     :SYMMETRIX       :5671  :5700201000 :      459840
/dev/sdbm        :EMC     :SYMMETRIX       :5671  :5700202000 :      459840


more....

 

this goes on forever , basically 36 times for each symmetrix lun.(one in bold above 0219 )

user90210
Level 2
Employee

Did all 5 steps . Same result after reboot.

TonyGriffiths
Level 6
Employee Accredited Certified

Hi

You may want to check the array settings using the doc that starflyfly suggested. The SCSI flags for the array will be listed (C bit, SPC2 etc)

From the output above it appears that DMP is seeing each dev as a seperate path, which could mean the serial numbers from the lun are not unique in DMP's view.

cheers

tony