02-23-2006
Epilog
OK, so I have a window with glance running to watch the internal operations of my dd command. The top few lines of glance are activity bars showing overall system utilization. For hours, disk usage was at 100%. Then I noticed that it dropped to 0. No disk utilization at all. Did my dd finish? Nope. It is still running. Both of my file pointers froze at exactly 34359738368. I allowed this situation to persist for a hour or so, mostly because I was busy with something else. Then I killed the dd command. I am certain it would have "ran" for another 4 days if I have let it. Or another 4 years. glance said that dd was in I/O wait and that (to me) points the finger towards the driver. If a gigabyte is 2^30, then 34359738368 is exactly 32 GB. That is a larger number than will fit into 32 bits. So the kernel, the driver, and dd are all in 64 bit mode. But apparently, the driver bumped into some other limit.
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LEARN ABOUT HPUX
max_async_ports
max_async_ports(5) File Formats Manual max_async_ports(5)
NAME
max_async_ports - maximum number of asynchronous disk ports that can be open at any time
VALUES
Failsafe
Default
Allowed values
Recommended values
There is no recommended value for this tunable. The number of processes that will be accessing the driver simultaneously can be used as a
guideline to set a value.
DESCRIPTION
The asynchronous disk driver provides an interface to execute high-performance I/O to the raw disk. Instead of reading or writing directly
to the raw disk, a process writes requests to the asynchronous driver which then makes appropriate calls to the disk driver.
Every process that opens the asynchronous disk driver is assigned a port. The driver uses the port to keep track of I/O and other internal
resources for that process. The number of opens to the asynchronous disk driver is limited by the number of available ports.
Who Is Expected to Change This Tunable?
Anyone.
Restrictions on Changing
Changes to this tunable take effect immediately if the new value is allowed; otherwise the change takes effect at next boot. Increases
within the allowed range are always accepted immediately. Decreases in the value may take effect immediately, or may be deferred until
next boot depending on the current number of ports in use or the maximum number of ports ever used.
When Should the Value of This Tunable Be Raised?
When the number of processes opening the driver needs to be more than the current value of the tunable.
What Are the Side Effects of Raising the Value of This Tunable?
The resources for the port are allocated from the kernel memory. Setting a higher value would result in the driver using slightly more
kernel memory. Other kernel components which may need kernel memory could suffer. However, the amount of memory reserved for each port is
low. Only when a new port is actually issued does any significant amount of memory get consumed.
When Should the Value of This Tunable Be Lowered?
There should be no real need to lower the value of the tunable. However, if many processes are opening the async driver and allocating
ports, then lowering the value will put a cap on the maximum number of ports that can be allocated and will put a cap on the maximum amount
of memory that the driver may allocate.
What Are the Side Effects of Lowering the Value of This Tunable?
The number of simultaneous opens are limited by this tunable. This may impact the performance of applications that need to have a higher
number of processes accessing the driver.
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 HP.
Tunable Kernel Parameters max_async_ports(5)