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vzubc, memory, and buffers [message #47096] Thu, 05 July 2012 18:05
Keith Keller is currently offline  Keith Keller
Messages: 5
Registered: May 2012
Junior Member
From: *
Hi again users,

I wanted to ask a quick question about the vzubc utility and buffers
inside a container. I have a container which has a lot of disk buffers
currently being stored in memory:

$ free
total used free shared buffers cached
Mem: 4194304 4116528 77776 0 0 3591588
-/+ buffers/cache: 524940 3669364
Swap: 524288 0 524288

This is IME a perfectly normal and acceptable situation (and the
container is behaving normally).

However, vzubc thinks that this is a warning situation:

# vzubc -q -r
------------------------------------------------------------ ----
CT 1018 | HELD Bar% Lim%| MAXH Bar% Lim%| BAR | LIM |+FAIL
-------------+---------------+---------------+-----+-----+-- ----
physpages|3.93G - 98%| 4G - 100%| - | 4G| -
------------------------------------------------------------ ----

What do people normally do in this situation? Would you simply ignore
warnings on physpages, or actively check the free buffers situation in
that CT?

In what might be a related question, I saw that vzcfgvalidate reports a
somewhat strange error in this CT:

# vzcfgvalidate 1018.conf
Warning: swappages.lim should be <= 0 (currently, 131072)
# grep SWAP 1018.conf

But isn't swappages.lim set to 512M here? And why should it be set to
less than or equal to 0? And why does vzcfgvalidate think it's some
number not 0 or 512M?

If it's helpful, here's my list of packages (this is a CentOS 6 box):

vzctl.x86_64 3.3-1 @openvz-utils
vzctl-lib.x86_64 3.3-1 @openvz-utils
vzkernel.x86_64 2.6.32-042stab055.10 @openvz-kernel-rhel6
vzkernel-firmware.noarch 2.6.32-042stab055.10 @openvz-kernel-rhel6
vzquota.x86_64 3.0.12-1 @openvz-utils

And kernel (yes, I know it is not the latest):

# uname -a
Linux xxxxxxxxxx 2.6.32-042stab055.10 #1 SMP Thu May 10 15:38:32 MSD 2012 x86_64 x86_64 x86_64 GNU/Linux

Thanks for any advice you have!


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