On Tue, 02 Aug 2011 10:06:58 -0400 (EDT), Peter Webb wrote:
>
> Do you want the code?
>
> Yes, it can and has been done. As you say, it works well for forward
> adjustments; CP abends on backward adjustments. For our old
> Multiprise 2000, which ran slow, it was fine. Our z9 runs fast,
> so we
On Tuesday, 08/02/2011 at 01:25 EDT, peter.w...@ttc.ca wrote:
> And if we had known about Server Time Protocol when we specced our z9,
> we would have gone with that, since it is a FAR better solution. As you
> say, the own code approach is playing with fire.
In the interests of full disclosure, w
Behalf Of Alan Altmark
Sent: August 2, 2011 13:10
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Modifying the System Clock on a Running VM System
On Tuesday, 08/02/2011 at 10:08 EDT, peter.w...@ttc.ca wrote:
> Yes, it can and has been done. As you say, it works well for forward
> adjustmen
On Tuesday, 08/02/2011 at 10:08 EDT, peter.w...@ttc.ca wrote:
> Yes, it can and has been done. As you say, it works well for forward
> adjustments; CP abends on backward adjustments. For our old Multiprise
2000,
> which ran slow, it was fine. Our z9 runs fast, so we no longer use it.
I don't de
Operating System [mailto:IBMVM@LISTSERV.UARK.EDU] On Behalf
Of Stephen Powell
Sent: July 30, 2011 19:33
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Modifying the System Clock on a Running VM System
On Sat, 30 Jul 2011 02:47:59 -0400 (EDT), Rob van der Heij wrote:
> On Sat, Jul 30, 2011 at 4:48
On Friday, 07/29/2011 at 08:58 EDT, Rob van der Heij
wrote:
> Uh, I'd say it has not desirable effect. CMS uses CP for the seconds,
> and TOD for the smaller bits...
You're right; I shouldn't say "no effect." CMS' mixed use of CP and TOD
time does affect the accuracy of CMS time values. But f
On Sat, 30 Jul 2011 02:47:59 -0400 (EDT), Rob van der Heij wrote:
> On Sat, Jul 30, 2011 at 4:48 AM, Stephen Powell wrote:
>>
>> Theoretically, it should be possible to do this with an assembler
>> program which uses the SCK (SET CLOCK) instruction, in conjunction
>> with the CP EXIT facility. Ho
On Sat, Jul 30, 2011 at 4:48 AM, Stephen Powell wrote:
> Theoretically, it should be possible to do this with an assembler
> program which uses the SCK (SET CLOCK) instruction, in conjunction
> with the CP EXIT facility. However, I have no idea what effect this
> will have on CP. The design of
On Fri, 29 Jul 2011 08:44:23 -0400 (EDT), Alan Altmark wrote:
>
> Other than IPL, there is no mechanism in VM to adjust the system TOD.
Theoretically, it should be possible to do this with an assembler
program which uses the SCK (SET CLOCK) instruction, in conjunction
with the CP EXIT facility.
Altmark
Sent: Friday, July 29, 2011 7:44 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Modifying the System Clock on a Running VM System
On Thursday, 07/28/2011 at 11:23 EDT, "Wandschneider, Scott"
wrote:
> We have a host VM system (z/VM 5.4 0902) that is located on the east
coast of
&
IBM z/VM Operating System [mailto:IBMVM@LISTSERV.UARK.EDU] On Behalf
Of Kris Buelens
Sent: Friday, July 29, 2011 1:40 AM
To: IBMVM@LISTSERV.UARK.EDU
Subject: Re: Modifying the System Clock on a Running VM System
That makes that CP will display a good time, but it will not help the guests
On Fri, Jul 29, 2011 at 2:44 PM, Alan Altmark wrote:
> The SET VTOD command is available if you want to influence the TOD seen by
> a guest. (It has no effect on CMS since CMS uses CP time.)
Uh, I'd say it has not desirable effect. CMS uses CP for the seconds,
and TOD for the smaller bits...
|
On Thursday, 07/28/2011 at 11:23 EDT, "Wandschneider, Scott"
wrote:
> We have a host VM system (z/VM 5.4 0902) that is located on the east
coast of
> the USA with a time zone of "WEST 04.00.00" however the actual TOD clock
is
> behind by four (4) minutes. Scheduling an IPL is difficult as thi
That makes that CP will display a good time, but it will not help the
guests: guests get their time by using the STCK instruction and apply their
timezone setting. Exceptions:
- VSE running with TIMEZONE VM. But, I doubt it will use the changed
time without an IPL
- Some parts of CMS us
We have a host VM system (z/VM 5.4 0902) that is located on the east coast of
the USA with a time zone of "WEST 04.00.00" however the actual TOD clock is
behind by four (4) minutes. Scheduling an IPL is difficult as this system hosts
many clients. To adjust the TOD clock, without an IPL, it has
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