To throw my $.02 in, do you have any non-critical equipment on the UPS that could be powered down ahead of time (non-essential tape, printers, etc) that could possibly extend the UPS uptime duration? I have lived thru this scenario - lost street power and no generator. We were able to extend the battery life of the UPS long enough to do the controlled shutdown by killing the non-essentials early.
Rex -----Original Message----- From: IBM Mainframe Discussion List [mailto:[EMAIL PROTECTED] On Behalf Of R.S. Sent: Wednesday, December 07, 2005 1:54 PM To: IBM-MAIN@BAMA.UA.EDU Subject: Re: How to quickly shut down system TISLER Zaromil wrote: > <------ snip ------> > Let's assume the following scenario: > "Disastrous" power outage occured, no alternate power source is > available, only UPS battery. Time for battery discharge is approx. 20-30 > minutes. > <------ snip ------> > > > Why do you believe you have 20-30 minutes to do something? I would > look how long can the weakest component stay available: switch or any > other interface on the path to devices and then to the mirror devices. > > How can you be sure that the connectivity between cpu and devices or > primary and secondary is still there during 20-30 minutes? E.g., in > the case that there is a connection through a switch and it loses > power, how long is its time for battery discharge? I believe so, because all datacentre is powered from that UPS. The only scenario I have to consider is UPS without external power source. Time of UPS battery discharge is displayed on UPS console. The value depends on current workload, and this is not thing which should be considered as sharp. I mean when you see 20 minutes, in reality it can last for 15 minutes or 45. That's my experience (from smaller UPSes however). So assumption is that all the devices needed to keep system running are powered from the same UPS. That includes CPC, DASD, FICON switch, DWDM box, etc. BTW: I don't know exact time, because of the reasons above, because of batteries age. I also don't know how calm will be operator. The procedure have to be as quick as possible and *SIMPLE*. Back to the question, what about DB2, which I'm most worried ? I'd like to "quiesce" all the system activity as much as possible, just to avoid long time for get the DR system ready. I don't want to spent hours to backout uncommited transactions or fight with JES2 to start it up. I also don't want to loose the data, from DB2 (obvoius) and possibly from JES2 spool. -- Radoslaw Skorupka Lodz, Poland ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
