Virtuozzo shares NP pool between VEs so it is not recommended to run more than 40-45 VEs on one x86 node (w2k3 x64 has 128GB NP pool limit so there are possible to run more VEs without any problems).
The problem can be tracked in the following way:
1. Open Task Manager, go to Performance tab and see Non-paged pool usage in Kernel Memory Usage area. Nonpaged value should be less than 220000K . Non-paged pool size limit is about 256000K, so if it’s overloaded, physical server becomes unresponsive ( It is valid for x86 (Non-64Bit) architecture only).
2. To find out the process which consumes Non paged memory pools, please open Processes tab, go to the top menu View, Select columns, check PID, Session ID and Non-paged Pool checkboxes.
3. Sort processes list by NP Pool column and look for the process with the largest NP Pool value. Remember the PID value of this process.
4. Please open cmd and use vzquery command line tool to find out which VE runs the process.
vzquery p2v <PID_found_at_previous_step> 5. Then you can try to determinate which services belong to the process:
vzctl exec VEID tasklist /svc Example:
PID is 10872, the process is svchost.exe
vzquery p2v 10872
Process ID: 10872
Session ID: 7 (ROOT)
VE ID: 119
Image Name PID Services
========================= ========
============================================
System Idle Process 0 N/A
System 4 N/A
smss.exe 868 N/A
csrss.exe 4388 N/A
winlogon.exe 6032 N/A
services.exe 2628 Eventlog, PlugPlay
lsass.exe 3316 Netlogon, PolicyAgent, ProtectedStorage, SamSs
svchost.exe 10104 DcomLaunch
svchost.exe 8248 RpcSs
svchost.exe 3112 Dhcp, Dnscache
svchost.exe 10440 LmHosts
svchost.exe 10872 AeLookupSvc, BITS, Browser, CryptSvc,
EventSystem, helpsvc, lanmanserver,
lanmanworkstation, Messenger, Nla,
Schedule, seclogon, SENS, winmgmt, wuauserv
spoolsv.exe 11680 Spooler
msdtc.exe 12044 MSDTC
Command 'exec' is successfully finished
So, svchost.exe grabs the memory from the pool and the recommendation could be the following:
Disable BITS and Automatic updates (wuauserv) service:
vzctl exec VEID sc config wuauserv start= disabled
vzctl exec VEID sc config bits start= disabled
vzctl restart VEID 