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10-18-2011 10:42 PM
10-18-2011 10:42 PM
Vxvm dmp and EMC powerpath
Hi,
We are using VxVM 5.0.31.5 in our HPUX 11.31 systems.The servers connected to EMC CX4-480 C storage through SAN switches.
I am confused with the multipathing - if it is using vxvm dmp or EMC powerpath. How we can check which is enabled.
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10-31-2011 07:46 AM
10-31-2011 07:46 AM
Re: Vxvm dmp and EMC powerpath
Hello,
Regarding DMP and from docs,
VxVM uses DMP metanodes (DMP nodes) to access disk devices connected to the
system. For each disk in a supported array,DMP maps one node to the set of paths
that are connected to the disk. Additionally, DMP associates the appropriate
multi-pathing policy for the disk array with the node. For disks in an unsupported
array, DMP maps a separate node to each path that is connected to a disk. The
raw and block devices for the nodes are created in the directories /dev/vx/rdmp
and /dev/vx/dmp respectively
A specified DMP node name must be a valid node in the
/dev/vx/[r]dmp directory.
For example( on a system running HP-UX B.11.23 and VxVM 5.0):
# date
Mon Oct 31 15:27:21 MET 2011
# vxdisk list
DEVICE TYPE DISK GROUP STATUS
c1t0d0 auto:hpdisk rootdisk01 rootdg online
c1t0d1 auto:LVM - - LVM
c1t1d0 auto:none - - online invalid
c1t1d1 auto:cdsdisk c7t1d1 dgCFS online shared
c1t1d2 auto:none - - online invalid
c1t1d3 auto:none - - online invalid
c1t1d4 auto:none - - online invalid
c1t1d5 auto:LVM - - LVM
c1t1d6 auto:LVM - - LVM
c1t1d7 auto:none - - online invalid
c1t2d0 auto:LVM - - LVM
c1t2d1 auto:none - - online invalid
c1t2d2 auto:cdsdisk - - online
c1t2d3 auto:none - - online invalid
c1t2d4 auto:none - - online invalid
c1t2d5 auto:none - - online invalid
c1t2d6 auto:cdsdisk disk02 yidg online
c1t2d7 auto:cdsdisk disk01 yidg online
# vxdisk list c1t1d1
Device: c1t1d1
devicetag: c1t1d1
type: auto
clusterid: cl_CFS
disk: name=c7t1d1 id=1305275022.68.MYHOSTNAME
group: name=dgCFS id=1305275705.70.MYHOSTNAME
info: format=cdsdisk,privoffset=128
flags: online ready private autoconfig shared autoimport imported
pubpaths: block=/dev/vx/dmp/c1t1d1 char=/dev/vx/rdmp/c1t1d1
guid: {4fcb182e-1dd2-11b2-8768-00306e271f6e}
udid: HP%5F0450%5FF65E%5F0450F65E0629
site: -
version: 3.1
iosize: min=512 (bytes) max=1024 (blocks)
public: slice=0 offset=32896 len=7141184 disk_offset=0
private: slice=0 offset=128 len=32768 disk_offset=0
update: time=1317114562 seqno=0.17
ssb: actual_seqno=0.0
headers: 0 120
configs: count=1 len=24072
logs: count=1 len=3648
Defined regions:
config priv 000024-000119[000096]: copy=01 offset=000000 enabled
config priv 000128-024103[023976]: copy=01 offset=000096 enabled
log priv 024104-027751[003648]: copy=01 offset=000000 enabled
lockrgn priv 027752-027823[000072]: part=00 offset=000000
Multipathing information:
numpaths: 3
c1t1d1 state=enabled
c3t1d1 state=enabled
c7t1d1 state=disabled
The vxdmpadm utility is a command line administrative interface to DMP.
# vxdmpadm getsubpaths dmpnodename=c1t1d1
NAME STATE[A] PATH-TYPE[M] CTLR-NAME ENCLR-TYPE ENCLR-NAME ATTRS
================================================================================
c1t1d1 ENABLED(A) - c1 XP1024 XP10240 -
c3t1d1 ENABLED(A) - c3 XP1024 XP10240 -
c7t1d1 DISABLED - c7 XP1024 XP10240 -
# vxdmpadm getdmpnode nodename=c1t1d1
NAME STATE ENCLR-TYPE PATHS ENBL DSBL ENCLR-NAME
=========================================================================
c1t1d1 ENABLED XP1024 3 2 1 XP10240
# vxdmpadm getdmpnode nodename=c3t1d1
NAME STATE ENCLR-TYPE PATHS ENBL DSBL ENCLR-NAME
=========================================================================
c1t1d1 ENABLED XP1024 3 2 1 XP10240
# vxdmpadm getdmpnode nodename=c7t1d1
NAME STATE ENCLR-TYPE PATHS ENBL DSBL ENCLR-NAME
=========================================================================
c1t1d1 ENABLED XP1024 3 2 1 XP10240
And/or you may also have a look if foreign devices are defined in your system.
listforeign
Lists information about foreign devices that have been
defined to VxVM.
# vxddladm listforeign
The Paths included are
-----------------------
Based on Directory names:
-----------------------
Based on Full Path:
--------------------
Extracted from VxVM V5.X admin guide:
Foreign devices
The device discovery feature of VxVM can discover some devices that are controlled
by third-party drivers, such as for EMC PowerPath. For these devices it may be
preferable to use the multipathing capability that is provided by the third-party
drivers rather than using the Dynamic Multi-Pathing (DMP) feature. Provided
that a suitable array support library is available, DMP can co-exist with such
drivers. Other foreign devices, for which a compatible ASL does not exist, can be
made available to Veritas Volume Manager as simple disks by using the vxddladm
addforeign command. This also has the effect of bypassing DMP.
Hope it helps,
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10-31-2011 09:31 AM
10-31-2011 09:31 AM
Re: Vxvm dmp and EMC powerpath
The following doc may also help you too,
Storage Multi-Pathing choices in HP-UX Serviceguard environments, August 2009