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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: *parallels.com
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
SWAPPAGES="0:512M"

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!


--keith


--
kkeller@wombat.san-francisco.ca.us
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