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 > > > > > > > > > > > > > > > > > > > > > ____________________________________________________________________________________> Never miss an email again! > > Yahoo! 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