This was very helpful -- thank you.
-----Original Message-----
From: Gary Robillard [mailto:[log in to unmask]]
Sent: Tuesday, May 13, 2008 9:04 AM
To: Hurdle, Michael PEROT (NASHF:5932); [log in to unmask]
Cc: Gary Robillard
Subject: RE: Clearing Page Deallocation Table on 997-400
Hi Michael,
STM runs on 6.5 and later, just requires an STM patch.
From the main menu (you might have to hit a key to stop an autoboot)
after the system is shutdown.
I have attached the Tclass Installation Manual in PDF format, starting
on page 3-49 there are instructions for bringing up the system, and page
3-52 shows how to get to the PDC interface (the main menu).
From the main menu the SE command gets you to the Service Menu...
Hope this helps...
Thanks,
Gary
-----Original Message-----
From: Michael Hurdle [mailto:[log in to unmask]]
Sent: Tuesday, May 13, 2008 7:47 AM
To: Gary Robillard; [log in to unmask]
Subject: RE: Clearing Page Deallocation Table on 997-400
1. The system in question is still running MPE/iX 6.5 and therefore
there is no CSTM (just SYSDIAG). 2. I don't know how to get to the
SERvice menu.
Thanks for your continued assistance.
-----Original Message-----
From: Gary Robillard [mailto:[log in to unmask]]
Sent: Monday, May 12, 2008 9:35 PM
Subject: Re: Clearing Page Deallocation Table on 997-400
Hello All,
The PDT (Page Deallocation Table) is a little different than the memory
error logs which are in the memlog file.
I am pretty sure that clearing the memory log file does not clear the
PDT, if it does, you can ignore the rest of this message.
Typically, if the memory logfile is cleared, the PDT info is added to
the memlog file when it is recreated by the memory logging process.
Is it possible that you really have double bit errors?
If so, a memory SIMM may need to be replaced. The PDT could be
preventing the system from failing due to double bit errors by allowing
the memory controller to skip the memory pages with the double bit
errors.
I have attached an excerpt from the MPE/iX 5.0 communicator article
describing memory page deallocation.
Below are a couple of ways that you might be able to clear the PDT on a
Tclass system (99x) since there is not a PDC (Processor Dependent Code)
command specifically for clearing the PDT table.
Just to reiterate, it is possible that you need to replace a memory SIMM
if there are double bit errors that are causing memory pages to be
deallocated, but it is probably worth a try to clear the PDT, especially
if you have replaced a memory SIMM that had double bit errors.
Note: The commands below require MPE to be shutdown, and the 997 to be
at the Main Menu in the boot console handler (PDC).
First, go to the service menu and issue the SP (Show PDT) command to
display the PDT entries. Try using the "toxic_flag_pd" command to
disable the PDT, then use the 'RE' cmd at the main menu to restart (or
reset) the system and use the new settings. Follow this by issuing the
"toxic_flag_pd" to insure that the PDT was disabled, then issue the
"toxic_flag_pd true" to re-enable the PDT, and issue the 'RE' command
and verify that the PDT feature was enabled.
After re-enabling the PDT, go to the Service Menu and issue the SP (Show
PDT) command to verify that the PDT was cleared.
If this doesn't work, the other way we cleared the PDT when there was no
PDC command to do so was to power off the system, change the memory size
and power the system back up. When the memory size changes, the memory
controller will reinitialize the PDT and the memory error log (on the
memory controller).
This can be accomplished by powering off the system, removing a memory
SIMM (with ESD protection), powering up the system and then issuing the
SP command from the Service Menu to verify that the PDT was cleared.
Once it is cleared, power off, reinstall the memory simm that was
removed (again with ESD protection), power up the system, then go to the
service menu and verify the PDT size with the SP command, and also
insure that PDT is enabled with the "toxic_flag_pd" command from the
main menu.
From the Tclass Installation Guide:
~~~~~start excerpt from Tclass Installation Guide~~~~~~
You should check the state of the PDT (enabled or disabled) using the
following procedure to determine if it is properly set for the OS
version running on the system.
------- Main Menu Commands
-----------------------------------------------------
Commands Available
PR Primary: Continue boot using primary boot path
RE Restart: Restart the system and activate new settings
Menus Available
BO Boot: Perform boot tasks (menu)
FI Firmware: Update firmware (menu)
SE Service: Service the system (menu)
TO Tomb: Display HPMC troubleshooting information (menu)
HE Help: Display help text on menu selections
-------
1. To display the current state of the PDT, enter toxic_flag_pd at the
Main Menu.
For example:
Main> toxic_flag_pd
PD - Enable Page Deallocation flag value is true
Main>
2. To enable PDT if it is disabled, enter toxic_flag_pd true. For
example:
Main> toxic_flag_pd true
PD - Enable Page Deallocation flag value is TRUE
NOTE DO NOT ENABLE THE PDT UNLESS THE SYSTEM IS RUNNING
MPE/iX 5.0 or HP-UX 10.0 OR HIGHER. THE SYSTEM CANNOT
HANDLE DOUBLE-BIT ERRORS.
3. To disable PDT if it is enabled, enter toxic_flag_pd false. For
example:
Main> toxic_flag_pd false
PD - Enable Page Deallocation flag value is false
4. If you change the PDT state, enter the command RESTART (RE) at the
PDC prompt to perform a hard reboot. ~~~~~end excerpt from Tclass
Installation Guide~~~~~~ Thanks,
Gary Robillard
-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On
Behalf Of Craig Lalley
Sent: Monday, May 12, 2008 4:51 PM
To: [log in to unmask]
Subject: Re: [HP3000-L] Clearing Page Deallocation Table on 997-400
Michael,
I apologize, having used cstm before, I made the mistake that the
program might actual do what it says it was doing.
I tried, CL to clear the log, I tried SL to switchlog again "fail".
I am nothing if not persistant... so what I did was
go into posix
xeq sh.hpbin.sys -L
cd /var/stm/logs/os
mv memlog memlog_old to move the old file out of the way
touch memlog to build a new file
exit out of posix, and stop and start stm deamonn.
:stmshut.diag this will happen fairly quickly
:stmstart.diag --> This would be an excellent time to go to lunch
or
go home for the evening
The next time you run logtool, you will only see new errors.
Sorry to have mislead you.
-Craig
Michael Hurdle <[log in to unmask]> wrote:
We are having double-bit memory errors reported each time we reboot
our
HP3000 Series 997-400. We have been told that we need to clear the Page
Deallocation Table (PDT) but don't know how to do this. Can anyone on
the
list help? Thank you.
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