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Full Discussion: chvg -g on Concurrent VG
Operating Systems AIX chvg -g on Concurrent VG Post 302259803 by funksen on Wednesday 19th of November 2008 03:39:32 AM
Old 11-19-2008
well it's no problem on non concurrent vgs,

another way, unfortunately offline, ist taking down hacmp, extend luns, cfgmgr, varyonvg in normal mode, run chvg, start the cluster, and hacmp synchronises the new vgda to other nodes


extending with new luns is the way we were doing it the last years, but this leads to 100+ luns on bigger systems
we run hacmp in virtualized environment, with two vio-servers, mpio on the lpar

this is really hard to administrate
 

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fcd_disable_mgmt_lun

fcd_disable_mgmt_lun(5) 					File Formats Manual					   fcd_disable_mgmt_lun(5)

NAME

       fcd_disable_mgmt_lun - select whether or not management luns are discovered in the legacy representation of mass storage devices

VALUES

   Failsafe
   Default
   Allowed values
       Enable discovery of management luns for array devices.

       Disable discovery of management luns for array devices.

   Recommended values
DESCRIPTION

       Management  luns  provide  the means to access the control ports of Fibre Channel disk arrays.  They are represented in both the legacy and
       the agile view of storage devices.  The legacy representation of a management lun is typically created under a separate	virtual  extension
       bus node.  The entry for a legacy management lun looks like this:

       On  a  system with a large number of storage devices connected, creation of management luns can result in an insufficient number of virtual
       extension buses for the legacy representation of data luns.  Since the number of extension buses on  a  system  is  limited  to	256,  luns
       requiring  virtual extension buses above 256 will be unusable through legacy device special files.  Disabling the discovery and creation of
       management luns will free up virtual extension buses for use by data luns.

       The default value for this tunable is

   Who Is Expected to Change This Tunable?
       System administrators who expect to use a large number of storage devices requiring more than 256 extension  buses  through  legacy  device
       special files.

   Restrictions on Changing
       Changes to this tunable take effect immediately.  However, existing management luns will not be removed.

   When Should the Tunable Be Turned On?
       This tunable should be turned on when the system runs out of extension buses for configuring the legacy representation of data luns.

   What Are the Side Effects of Turning the Tunable Off?
       None.

   When Should the Tunable Be Turned Off?
       When the functionality provided by the management lun is desired.

   What Are the Side Effects of Turning the Tunable On?
       Existing management luns in the legacy representation will show up in the state.

   What Other Tunables Should Be Changed at the Same Time?
       None.

WARNINGS

       All  HP-UX kernel tunable parameters are release specific.  This parameter may be removed or have its meaning changed in future releases of
       HP-UX.

       Installation of optional kernel software, from HP or other vendors, may cause changes to tunable  parameter  values.   After  installation,
       some  tunable  parameters may no longer be at the default or recommended values.  For information about the effects of installation on tun-
       able values, consult the documentation for the kernel software being installed.	For information about optional kernel  software  that  was
       factory installed on your system, see at

AUTHOR

       was developed by Hewlett-Packard Company.

SEE ALSO

       ioinit(1M), ioscan(1M), kctune(1M).

							     Tunable Kernel Parameters					   fcd_disable_mgmt_lun(5)
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