Re: RHEL 4 - Memory Problem

Herta,

I must thank you very much for your info. Really appreciate it.

QN

----- Original Message ----
From: Herta Van den Eynde <herta.vandeneynde@xxxxxxxxx>
To: General Red Hat Linux discussion list <redhat-list@xxxxxxxxxx>
Sent: Monday, March 26, 2007 7:57:47 AM
Subject: Re: RHEL 4 - Memory Problem

Hi QN,

As to your initial question about memory consumption: for regular
quick checks look at the "si" (= swap in) and "so" (= swap out)
columns of vmstat. As long as there's no (or hardly any) swapping,
you know you're OK.
If you'd like to read up on memory management, try google with "linux
memory management", or "linux internals".

LVS won't work for Oracle RAC. It's not cluster aware.
You need a filesystem that is cluster aware (such as GFS or OCFS(2))
or at least can be shared among multiple systems such as NFS.
OCFS is nice, but last I looked, it won't give you software RAID, or a
way to resize your filesystem.
ASM does have those features. Disadvantage of ASM is that you need
RMAN to backup your database. Which in itself isn't a bad thing as it
allows for faster backups and restores. But it is an extra product to
learn.
Note also that OCFS and ASM can be used free of charge. GFS comes at
a (significant) price.

Kind regards,

Herta

On 20/03/07, qua nong <quanong_os@xxxxxxxxx> wrote:
Troy,

Thanks a lot for your reply.
Our industry are making Trains and develops software for the railway network.
I'd really like to have a go at setting up LVS and install Oracle RAC on it.
But I've heard that the ocfs2 filesystem is much better for Oracle RAC then GFS.
Recently I went to the RH436 - HA cluster and GFS course but it did not include the LVS. I donnot why.

Thanks again.
QN

----- Original Message ----
From: Troy Knabe <knabe@xxxxxxxxxxx>
To: General Red Hat Linux discussion list <redhat-list@xxxxxxxxxx>
Cc: General Red Hat Linux discussion list <redhat-list@xxxxxxxxxx>
Sent: Friday, March 16, 2007 4:12:34 PM
Subject: Re: RHEL 4 - Memory Problem

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@xxxxxxxxx>
Date: Thursday, March 15, 2007 9:50 pm
Subject: Re: RHEL 4 - Memory Problem
To: General Red Hat Linux discussion list <redhat-list@xxxxxxxxxx>

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@xxxxxxxxxxx>
To: General Red Hat Linux discussion list <redhat-list@xxxxxxxxxx>
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@xxxxxxxxx>
Date: Thursday, March 15, 2007 9:02 pm
Subject: RHEL 4 - Memory Problem
To: redhat-list@xxxxxxxxxx

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@xxxxxxxxxxx
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@xxxxxxxxxxx
Ph: 541.687.3587
Cell: 541.968.0780


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