Hey OpenVZ users,
Im currently encountering a weird issue but dont know how to fix it.
Some containers on our node are freaking out sometimes. Thats not the
issue. Its customer related.
However they take the node almost down. The host node has an IO delay of
30-50% at that time and needs about 5 minutes to
Become stable again. SSH login is (almost) impossible. Shell is not running
properly.
Dmesg reports the following:
__ratelimit: 1892 callbacks suppressed
Fatal resource shortage: privvmpages, UB 371.
Fatal resource shortage: privvmpages, UB 371.
Fatal resource shortage: privvmpages, UB 371.
Fatal resource shortage: privvmpages, UB 371.
After taking a look at the bean counters of that container I got the
following:
----------------------------------------------------------------
CT 371 | HELD Bar% Lim%| MAXH Bar% Lim%| BAR | LIM | FAIL
-------------+---------------+---------------+-----+-----+------
kmemsize|45.8M - - | 223M - - | - | - | -
lockedpages| - - - | 32K - - | 4G| 4G| -
privvmpages|3.25G 27% 27%| 12G 100% 100%| 12G| 12G| 303K
shmpages| 114M - - | 147M - - | - | - | -
numproc| 127 - - | 318 - - | - | - | -
physpages|1.08G - 26%| 4G - 100%| - | 4G| -
vmguarpages| - - - | - - - | 8G| - | -
oomguarpages|1008M 24% - |2.45G 61% - | 4G| - | -
numtcpsock| 31 - - | 173 - - | - | - | -
numflock| 21 - - | 48 - - | - | - | -
numpty| - - - | 1 - - | - | - | -
numsiginfo| - - - | 102 - - | - | - | -
tcpsndbuf|1.22M - - |16.6M - - | - | - | -
tcprcvbuf| 496K - - | 2.7M - - | - | - | -
othersockbuf|81.3K - - |5.72M - - | - | - | -
dgramrcvbuf| - - - | 117K - - | - | - | -
numothersock| 66 - - | 284 - - | - | - | -
dcachesize|24.8M - - | 178M - - | - | - | -
numfile|2.69K - - |3.13K - - | - | - | -
numiptent| 62 - - | 62 - - | - | - | -
swappages| 367M - 9%| 986M - 24%| - | 4G| -
A failure count of 300.000 on privvmpages is not normal. However Im using
vSWAP and the RAM is limited to 12G.
Node has 30GB of 64GB free, so thats not the issue.
Anyone has a clue, why the host is almost going down? A single container
shouldnt affect the hosts performance.
Currently running pve-kernel-2.6.32-43-pve:
2.6.32-166(pve-kernel-2.6.32-43-pve: 2.6.32-166) with vzctl 4.9-4.
Containers are using the ploop layout and are laying on a LVM(root lvm
partition).
Thank you for your time.
----------------------------------------------------------------------------
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If you have any further questions, please let us know.
Mit freundlichen Grüßen / With best regards
Henry Spanka | myVirtualserver Development Team
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