page deallocation full (PDT) FULL

[AA786]

hi

how to trouble shoot for error PDT full ?
PDT Entries Used: 256
PDT Entries Free: 0
PDT Total Size: 256
-- Information Tool Log for MEMORY on path 192 --
----------------
i need to PDT entries less,pls advice...

[Fabian Briseño]

Hello AA786.
Check this link for the probable answer.
Hope thie helps.

http://www1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en&docId=emr_na-c01022592-1

[Fabian Briseño]

What server are you using, what OS ?

Also check this link.

http://www1.itrc.hp.com/service/cki/docDisplay.do?docLocale=en&docId=emr_na-c01011729-2

See if this an link above apply to your system.

[Torsten.]

Hi,

if a single bit error occurs several times the system will try to free up this small amount of memory and no longer use them.
If you have an old diagnostics version this could lead to "false alarms". Check the version first. Otherwise you could really have a bad dimm and need to replace this part. Contact HP support!

[Andrew Rutter]

hi,

if its that full then you are likely to have some bad memory installed. does it test ok in STM?
and what does the rest of the information for the memory say?

to clea the PDT needs a reboot to pdc.

stop server from booting and go into ser menu

MA> ser

from here issue pdtclear

SER>pdtclear

then the server will reboot again allow it to boot up properly and then monitor it closely


Andy

[Prashanth.D.S]

Hi,

Yup as Andrew says system is definetly has a bad memory dimm, would suggest you to replace it and then clear the PDT table..

Check the below mentioned command output findout which memory dimm is reporting large amount of SBE's (single bit memory errors). Have it replaced and then clear the PDT from BCH and remove memlog file from /var/stm/logs/os.




#more /var/opt/resmon/log/event.log
#echo "map selall info;wait infolog" | cstm > /tmp/cstm.txt  
#echo "gop cstmpager cat;scl type mem;info;wait;il"|cstm > /tmp/mem.out 
#echo "gop cstmpager cat;ru l\nvd\n"|cstm >> /tmp/mem.out

check cstm and memlog outputs for possible SBE errors..

Best Regards,
Prashanth

[Bill Hassell]

A page is deallocated when there is a significant number of memory errors in that page. If you have more than a dozen or so, look at the cstm listing to see where all the errors are occurring and replace the memory. If you just clear the PDT then the errors will come back again, possibly worse (uncorrectable) and your system will crash.

[Sindhia Naidu]

Log call with HP.

There is a certain amount of PDT entries and errors allowed per memory dimm per address.

They will determine if the memory needs to be replaced or a reboot is required to reallocated the faulty cells within memory.

Can you post your PDT table?

[AA786]

thanks