add a hdiskpower in a vg Post: 102043

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Operating Systems AIX add a hdiskpower in a vg Post 102043 by bakunin on Wednesday 15th of March 2006 08:34:01 AM

03-15-2006

Registered User

The LVM imposes several limits, all of which have to be considered. On a PV level the most important ones are:

not more than 1016 PPs per PV
not more than 32 PVs per VG

You can change that behaviour by converting a VG to "big", which means halving (quartering, ...) the number of possible PVs per VG whilst increasing the number of PPs per PV accordingly. This usually doesn't make sense for a VG factor beyond 2.

Better in this case is to back up and recreate the VG with more sensible values. It makes sense in most cases to set the PP size to 128MB or even 256 MB, which allows for single PVs as big as 130 (260) GB. It may be more effort *once* to do this but in the long run it pays off not to have to twiddle with the different factors in the VG - too many restraints to be obeyed in the long run.

bakunin

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devinfo

devinfo(1M)						  System Administration Commands					       devinfo(1M)

NAME

       devinfo - print device specific information

SYNOPSIS

       /usr/sbin/devinfo -i device

       /usr/sbin/devinfo -p device

DESCRIPTION

       The  devinfo  command  is used to print device specific information about disk devices on standard out. The command can only be used by the
       superuser.

OPTIONS

       -i	Prints the following device information:

		  o  Device name

		  o  Software version (not supported and prints as 0)

		  o  Drive id number (not supported and prints as 0)

		  o  Device blocks per cylinder

		  o  Device bytes per block

		  o  Number of device partitions with a block size greater than zero

       -p	Prints the following device partition information:

		  o  Device name

		  o  Device major and minor numbers (in hexadecimal)

		  o  Partition start block

		  o  Number of blocks allocated to the partition

		  o  Partition flag

		  o  Partition tag

       This command is used by various other commands to obtain device specific  information for the making of file systems and determining parti-
       tion  information. If the device cannot be opened, an error message is reported.

OPERANDS

       device	Device name.

EXIT STATUS

       0	Successful operation.

       2	Operation failed.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       prtvtoc(1M), attributes(5)

SunOS 5.10							    8 May 1997							       devinfo(1M)