HP3000-L Archives

August 2001, Week 4

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Subject:
XM Checkpoint freezing other users.
From:
Greg Chaplin <[log in to unmask]>
Reply To:
Greg Chaplin <[log in to unmask]>
Date:
Mon, 27 Aug 2001 16:50:35 +1000
Content-Type:
text/plain
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text/plain (37 lines) 
Hi all.

We have a problem on our 969 where a system process on pin 11 named xm_static_checkpoint_serv is regularly taking over the machine and locking out all other activity for around 20 seconds. Note that the end of the name was truncated so I'm not sure of the full name. From what I've ascertained from the list archives and discussions with HP in Australia, this is a process of the Transaction Manager posting stuff to disk.

We have changed the priority of the process in VOLUTIL using ALTERCHKPTPRI from the default of 152 to 200 and then to 204, as recommended by HP, but to no avail - the system still freezes.

I have looked through the archives for any postings indicating how people have managed to overcome/avoid this problem, but have not found anything - the postings were mainly people asking "what is it" and replies to that.

There was no noticeable pause before a couple of weeks ago when we upgraded from MPE/iX 6.0 to 6.5, added an extra DDS drive, and added 2 more 18gb discs (we previously had a disc i/o bottleneck). Could it have been the upgrade to 6.5? Or could it have been that adding the discs has allowed the XM to write to disc faster?

So I ask the questions:
 - how do we overcome this problem?
 - do I have to reboot every time we change the priority?

We are on 6.5 express 2, with the following patches according to HPSWINFO:
NSTFDX5A  General Fixes for NS TRANSPORT on MPE/iX 6.5 (A2) Patch
FTPFDU8A  GENERAL FIXES FOR FTP FOR 6.5 RELEASE (B Patch).
INTFDX3A  General Fixes for Intersrv Products on MPE/iX 6.5 (B)
NSTGD16A  General Fixes for NS TRANSPORT on MPE/iX 6.5 (A5) Patch

TIA.


------------------------------------------------------------------------------------------
Greg Chaplin                  
www.unisuper.com.au
[log in to unmask]
UniSuper                       
Level 37, 385 Bourke Street
Melbourne  VIC  3000,          
Australia.                     
Phone: 61 3 9691 4145
Fax:   61 3 9691 4141

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