Shared Services Platform Post: 302640095

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Operating Systems AIX Shared Services Platform Post 302640095 by bakunin on Monday 14th of May 2012 05:51:22 AM

05-14-2012

Registered User

Quote:

Originally Posted by zaxxon

You also have to keep in mind, that sloppy code will not always be speeded up by pure hardware power. There might be some point where there is not much speedup seen, no matter what you activate.

This is absolutely true.

Sloppy code is usually not only demanding more resources than it ought to demand but also demanding more resources to modify it. That means that software maintenance will be a lot more costly than with good code and this will raise the TCO of the program(s).

If systems you administrate are performance-critical the best advice i can give you: agree to some form of SLA with your customers. Get some number which can be measured - number of transactions, response time in seconds, whatever - and get your customer to agree about some threshold value which will mark the border between their needs being met and their needs being not met.

This is raising demands from the subjective feeling ("i feel the system is somewhat slow today") to an objectively measurable fact. Either the system is "fast enough" or it isn't but as long as you are measured against some gut-feeling of some people whose benevolence is usually in great doubt (they simply don't care if they make life miserable for you) you are fighting an uphill fight.

So get your customers to agree to some value of x which they will deem satisfactorial and every complaint from there on can be measured against this value and proven to be correct (=you have to work) or wrong (=they have to shut up).

I hope this helps.

bakunin

bakunin

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LEARN ABOUT ULTRIX

mge-shut

MGE-SHUT(8)							    NUT Manual							       MGE-SHUT(8)

NAME

       mge-shut - Driver for SHUT Protocol UPS equipment

SYNOPSIS

       mge-shut -h

       mge-shut -a UPS_NAME [OPTIONS]

	   Note
	   This man page only documents the hardware-specific features of the mge-shut driver. For information about the core driver, see
	   nutupsdrv(8).

SUPPORTED HARDWARE

       mge-shut supports all recent Eaton, MGE and Dell UPS models which use the SHUT (Serial HID UPS Transfer) protocol.

       Older MGE models, such as Pulsar ESV+, Pulsar EX and Pulsar ES+, use the U-Talk protocol and should use the mge-utalk driver.

EXTRA ARGUMENTS

       This driver also supports the following optional settings:

       lowbatt=num
	   Set the low battery warning threshold at which shutdown is initiated by upsmon(8).

	   The factory default value is 30 (in percent), and can be settable depending on the exact model.

       offdelay=num
	   Set the timer before the UPS is turned off after the kill power command is sent (via the -k switch).

	   The default value is 20 (in seconds). Usually this must be lower than ondelay, but the driver will not warn you upon startup if it
	   isn't.

       ondelay=num
	   Set the timer for the UPS to switch on in case the power returns after the kill power command had been sent but before the actual
	   switch off. This ensures the machines connected to the UPS are, in all cases, rebooted after a power failure.

	   The default value is 30 (in seconds). Usually this must be greater than offdelay, but the driver will not warn you upon startup if it
	   isn't. Some UPS'es will restart no matter what, even if the power is (still) out at the moment this timer elapses. In that case, you
	   could try if setting ondelay = -1 in ups.conf helps.

       notification=num
	   Set notification type to 1 (no), 2 (light) or 3 (yes).

	   The default value is 3 (yes) because of some early Ellipse models which need it.

KNOWN ISSUES

   Repetitive timeout and staleness
       Some models tends to be unresponsive with the default polling frequency. The result is that you have some "data stale" errors in your
       system log.

       In this case, simply modify the general parameter "pollinterval" to a higher value (like 10 for 10 seconds). This should solve the issue.

       Using notification=3 might also help.

AUTHOR

       Arnaud Quette

SEE ALSO

   The core driver
       nutupsdrv(8)

   Internet resources
       The NUT (Network UPS Tools) home page: http://www.networkupstools.org/

Network UPS Tools						    05/21/2012							       MGE-SHUT(8)