09-20-2017
I'm not surprised that CPU utilization hits 100%, at least for a while. Where are you sending the backup? To another local drive, over the network, to a SAN, or what?
When you say the system goes down, how? Does it panic, or what?
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LEARN ABOUT HPUX
dlpi_max_ub_promisc
dlpi_max_ub_promisc(5) File Formats Manual dlpi_max_ub_promisc(5)
NAME
dlpi_max_ub_promisc - maximum number of unbound promiscuous streams allowed on a LAN interface
VALUES
Failsafe
Default
Allowed values
or
Recommended values
DESCRIPTION
The tunable is used to dynamically increase or decrease the maximum number of unbound promiscuous streams that can be opened on a LAN
interface.
Enabling multiple unbound promiscuous streams may cause CPU utilization to increase up to three times as compared to CPU utilization with
no unbound promiscuous streams. Increasing the value of this tunable does not by itself degrade networking or kernel performance.
Who Is Expected to Change This Tunable?
Privileged user.
Restrictions on Changing
Changes to this tunable take effect immediately. When value is reduced from a higher value to a lower value, the existing unbound promis-
cuous streams will not be stopped to accommodate the change. However, this tunable will limit the new unbound streams created on the
interface.
When Should the Value of This Tunable Be Raised?
This tunable should be raised when the number of unbound promiscuous applications needs to be more than the default value.
What Are the Side Effects of Raising the Value?
Side effect may be an increase in CPU utilization.
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 HP.
SEE ALSO
kctune(1M), lanadmin(1M), gettune(2), settune(2), lan(7).
DLPI Programmer's Guide on
Tunable Kernel Parameters dlpi_max_ub_promisc(5)