RHEL 4 - Memory Problem

Fri Mar 16 05:56:11 UTC 2007

Are you using the hugemem kernel ??!

On 3/16/07, Troy Knabe <knabe at 4j.lane.edu> wrote:
> I use Red Hat AS 4 and Oracle Cluster Services and we installed everything on a NetApp Filer and mounted even the CRS directory via NFS.
>
> I have 2 bonded 1Gig NICs to a cluster of 2 Filer Heads. We actually lost the primary filer head one day and Oracle never missed a beat.
>
> I came from a SAN environment and was very skeptical of NAS. We have had a couple of Super Secret Oracle issues that we have run into, that we had to open a support case for, but stability and performance have been great.
>
> Do you mind if I ask what manufacturer you are running? I am running Sun x4100's.
>
> -Troy
>
>
> ----- Original Message -----
> From: qua nong <quanong_os at yahoo.com>
> Date: Thursday, March 15, 2007 9:50 pm
> Subject: Re: RHEL 4 - Memory Problem
> To: General Red Hat Linux discussion list <redhat-list at redhat.com>
>
> > Hi,
> >
> > Below is the output of free
> >
> > # free
> > total used free shared buffers cached
> > Mem: 16360260
> > 16197904 162356 0 256496 14974144
> > -/+ buffers/cache: 967264 15392996
> > Swap: 33551744
> > 186960 33364784
> >
> > May I also ask you that as you mentioned that you run Oracle RAC
> > on linux box. Do you use RHEL3 cluster or 4, GFS or OCFS ?
> >
> > Qua
> >
> >
> > ----- Original Message ----
> > From: Troy Knabe <knabe at 4j.lane.edu>
> > To: General Red Hat Linux discussion list <redhat-list at redhat.com>
> > Sent: Friday, March 16, 2007 3:20:02 PM
> > Subject: Re: RHEL 4 - Memory Problem
> >
> > Try running the command "free" I think, although I don't
> > know why and would love for someone on this list to answer this
> > question that this is a better actual representation of the free
> > memory on the box.
> >
> > I am running the same config as you, only 3 boxes with 8 gig of
> > RAM each and Oracle RAC.
> >
> > My hunch is that top and vmstat are showing the actual memory
> > locations that are empty, where a "free" command shows the
> > memory addresses that while may have something in them, are able
> > to be recycled and used.
> >
> > Can someone verify that I am right or way off base?
> >
> > Thanks
> > -Troy
> >
> >
> > ----- Original Message -----
> > From: qua nong <quanong_os at yahoo.com>
> > Date: Thursday, March 15, 2007 9:02 pm
> > Subject: RHEL 4 - Memory Problem
> > To: redhat-list at redhat.com
> >
> > > Hi list,
> > >
> > > We have a AMD with RHEL4 64 installed and the Oracle 10g
> > > installed as well.
> > > It has the latest kernel update 2.6.9-42.0.8.ELsmp but
> > the
> > > memory is always being used by some unexplained processes.
> > >
> > > There are 4 CPUs, 16 GB RAM, 33GB swap but memory used = 16148872k
> > >
> > > Even when oracle is shutdown, a memory use is
> > still
> > > nearly 16GB. CPU is 99.4 % in idle, and I/O is too quiet. This
> > > is quite difficult to explain.
> > >
> > > Could anyone have any idea ?
> > >
> > > Here is the display of the top command
> > >
> > > top - 14:57:33 up 30 days, 22:29, 3 users, load
> > > average: 0.22, 0.10, 0.02
> > > Tasks: 121 total, 1 running, 120
> > > sleeping, 0 stopped, 0 zombie
> > > Cpu(s): 0.0% us, 0.0% sy, 0.0% ni, 99.4%
> > > id, 0.6% wa, 0.0% hi, 0.0% si
> > > Mem: 16360260k total, 16198280k used,
> > 161980k
> > > free, 256496k buffers
> > > Swap: 33551744k total, 186960k used, 33364784k
> > free,
> > > 14973940k cached
> > >
> > > vmstat 2
> > > procs -----------memory---------- ---swap-- -----io---- --
> > system-
> > > - ----cpu----
> > > r b swpd free
> > > buff cache si
> > so
> > > bi bo in cs us
> > > sy id wa
> > > 0 0 186960 161420 256496
> > 14973940
> > > 0 0 1
> > > 112 3 1
> > 0
> > > 0 99 1
> > > 0 0 186960 162284 256496
> > 14973940
> > > 0 0 0
> > 170
> > > 1021 2162 0 0 100 0
> > > 0 0 186960 162276 256496
> > 14973940
> > > 0 0
> > > 0 44 1009 2149 0 0
> > 100 0
> > > 0 0 186960 162284 256496
> > 14973940
> > > 0 0
> > > 0 42 1008 2244 0 0
> > 99 0
> > > 0 0 186960 162292 256496
> > 14973940
> > > 0 0
> > > 0 48 1011 2164 0 0
> > 99 0
> > > 0 0 186960 162292 256496
> > 14973940
> > > 0 0
> > > 0 56 1006 2118 0 0
> > 100 0
> > > 0 0 186960 162292 256496
> > 14973940
> > > 0 0
> > > 0 66 1011 2154 0 0
> > 98 2
> > >
> > >
> > >
> > > cat /proc/meminfo
> > > MemTotal: 16360260 kB
> > > MemFree: 162740 kB
> > > Buffers: 256496 kB
> > > Cached: 14973940 kB
> > > SwapCached: 9724 kB
> > > Active: 2709340 kB
> > > Inactive: 12799980 kB
> > >
> > HighTotal: 0 kB
> > >
> > HighFree: 0 kB
> > > LowTotal: 16360260 kB
> > > LowFree: 162740 kB
> > > SwapTotal: 33551744 kB
> > > SwapFree: 33364784 kB
> > >
> > Dirty: 332 kB
> > > Writeback: 140 kB
> > > Mapped: 1147256 kB
> > >
> > Slab: 608056 kB
> > > CommitLimit: 41731872 kB
> > > Committed_AS: 7853044 kB
> > > PageTables: 39080 kB
> > > VmallocTotal: 536870911 kB
> > > VmallocUsed: 16760 kB
> > > VmallocChunk: 536854071 kB
> > > HugePages_Total: 0
> > > HugePages_Free: 0
> > > Hugepagesize: 2048 kB
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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> >
> > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > Troy Knabe
> > Senior Systems Administrator
> > Computing and Information Services
> > 4J School District
> > knabe at 4j.lane.edu
> > Ph: 541.687.3587
> > Cell: 541.968.0780
> >
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>  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Troy Knabe
> Senior Systems Administrator
> Computing and Information Services
> 4J School District
> knabe at 4j.lane.edu
> Ph: 541.687.3587
> Cell: 541.968.0780
>
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