NAME
maxvgs — maximum number of LVM Volume Groups that can be created/activated on the system
VALUES
Recommended values
10-256
The value for
maxvgs
should be no larger than the anticipated needs of the system.
Resources are reserved for the number of volume groups indicated,
so setting an unnecessarily large
maxvgs
value on systems with limited
resources is not advisable.
Conversely, it does not make sense to set
maxvgs
to a low value since it will likely have to be raised later when a greater
number of volume groups is utilized.
DESCRIPTION
Maximum number of LVM Volume Groups which may be created or activated on
the system.
This value also limits the range of Volume Group numbers allowed. A
maxvgs
value of 10, for example, allows 10 Volume Groups to be created on the system,
and the Volume Group number of each Volume Group is a unique value in the
range of 0 to 9.
Who Is Expected to Change This Tunable?
Anyone.
Restrictions on Changing
When
maxvgs
is modified the change takes effect at the next system reboot.
When Should the Value of This Tunable Be Raised?
A Volume Group cannot be created or activated if its volume group number exceeds
maxvgs.
If this occurs, the customer should choose a volume group number
that does not exceed
maxvgs,
or raise the
maxvgs
value to accommodate the volume group number chosen.
What Are the Side Effects of Raising the Value of This Tunable?
Additional kernel resources are consumed.
Approximately 4-8KB of lockable
physical memory is consumed by advancing the
maxvgs
value by 1.
When Should the Value of This Tunable Be Lowered?
On systems with very limited kernel memory, lowering
maxvgs
to 10 or less may free memory for other uses.
Lower the
maxvgs
value only when it is
certain that the number of Volume Groups to be created or activated on the
system will not exceed the new value.
What Are the Side Effects of Lowering the Value of This Tunable?
If
maxvgs
is set to too small a value, it is possible that some volume
groups cannot be created or activated.
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 tunable values, consult the documentation
for the kernel software being installed.
For information about optional kernel software that was
factory installed on your system, see
HP-UX Release Notes
at
http://docs.hp.com.
AUTHOR
maxvgs
was developed by HP.
