Re: linux server slow.
- From: unix syzadmin <unixsyzadmin@xxxxxxxxx>
- Date: Wed, 14 Dec 2005 22:28:24 +0530
Hi,
The configuration of the 2 LPAR's is done such that the CPU and memory
resources are equally divided.
Even though the LPAR's are allocated 3.5GB RAM each, the Linux top or free
command shows only 480MB as the available RAM.
RHEL AS4
========
[root@bangpcplin3 ~]# free -m
total used free shared buffers cached
Mem: 360 352 7 0 5 74
-/+ buffers/cache: 271 88
Swap: 3074 319 2755
Have anybody else faced a similar circumstance, where the available memory
is more than what is seen by the linux operating system? if so please guide
me.
Thanks & Regards,
-GnanaShekar-
On 12/14/05, Larry D Sorensen <larry.sorensen@xxxxxxxx> wrote:
>
> It looks like your problem may be with the Virtual IO partition rather
> than with your Linux partition. I would start there and look back over
> your configurations for that. IBM has some good documentation on LPARs
> and VIO on their web site.
>
> On Wed, 14 Dec 2005 09:27:32 +0530 unix syzadmin <unixsyzadmin@xxxxxxxxx>
> writes:
> > Hi,
> >
> > We have setup 2 LPARs (Logical Partitions) on IBM p5-550.
> > One for AIX 5.3, The 2nd one for the RHEL AS4.
> > The server has 4 CPU's and 8GB RAM. It has two 140GB hard disk.
> > The 2 LPAR's are configured with a virtual ethernet client and
> > virtual
> > SCSI client.
> >
> > We have created 2 volume groups and each volume group containing 2
> > logical
> > volumes. We have assiged 2 logical volumes to each virtual host.
> >
> > The CPU and memory is divided as follows
> > VIO partition -->.5 (5 Virtual processors), 512MB RAM
> > AIX partition --> 1.7 (17 Virtual processors), 3.5GB RAM
> > RedHat AS4 partition -->1.7 (17 Virtual processors), 3.5GB RAM
> >
> > Just see a sample of output of ping to another server in the network
> > from
> > RHEL AS4.
> >
> > [root@bangpcplin1 ~]# ping bangpcplin3
> > PING bangpcplin3.bea.com (172.22.43.47) 56(84) bytes of data.
> > 64 bytes from bangpcplin3.bea.com (172.22.43.47): icmp_seq=0 ttl=64
> > time=
> > 21.8 ms
> > 64 bytes from bangpcplin3.bea.com (172.22.43.47): icmp_seq=1 ttl=64
> > time=
> > 9.05 ms
> > 64 bytes from bangpcplin3.bea.com (172.22.43.47): icmp_seq=2 ttl=64
> > time=
> > 8.97 ms
> > 64 bytes from bangpcplin3.bea.com (172.22.43.47): icmp_seq=3 ttl=64
> > time=
> > 10.0 ms
> > 64 bytes from bangpcplin3.bea.com (172.22.43.47): icmp_seq=4 ttl=64
> > time=
> > 13.0 ms
> > 64 bytes from bangpcplin3.bea.com (172.22.43.47): icmp_seq=5 ttl=64
> > time=
> > 11.0 ms
> > 64 bytes from bangpcplin3.bea.com (172.22.43.47): icmp_seq=6 ttl=64
> > time=
> > 8.98 ms
> > 64 bytes from bangpcplin3.bea.com (172.22.43.47): icmp_seq=7 ttl=64
> > time=
> > 6.60 ms
> > 64 bytes from bangpcplin3.bea.com (172.22.43.47): icmp_seq=8 ttl=64
> > time=
> > 10.9 ms
> > 64 bytes from bangpcplin3.bea.com (172.22.43.47): icmp_seq=9 ttl=64
> > time=
> > 9.98 ms
> > 64 bytes from bangpcplin3.bea.com (172.22.43.47): icmp_seq=10 ttl=64
> > time=
> > 10.0 ms
> > 64 bytes from bangpcplin3.bea.com (172.22.43.47): icmp_seq=11 ttl=64
> > time=
> > 7.92 ms
> > 64 bytes from bangpcplin3.bea.com (172.22.43.47): icmp_seq=12 ttl=64
> > time=
> > 9.98 ms
> >
> > --- bangpcplin3.bea.com ping statistics ---
> > 13 packets transmitted, 13 received, 0% packet loss, time 12088ms
> > rtt min/avg/max/mdev = 6.605/10.650/21.824/3.557 ms, pipe 2
> > [root@bangpcplin1 ~]#
> >
> > Also see a sample output of "iostat 5"
> >
> > [root@bangpcplin1 ~]# iostat 5
> > Linux 2.6.9-5.EL (bangpcplin1) 12/14/2005
> >
> > avg-cpu: %user %nice %sys %iowait %idle
> > 0.82 0.00 0.43 1.13 97.62
> >
> > Device: tps Blk_read/s Blk_wrtn/s Blk_read
> > Blk_wrtn
> > sda 10.61 140.42 63.16 142819579
> > 64242894
> > sdb 1.83 35.94 25.10 36551596
> > 25528376
> >
> > avg-cpu: %user %nice %sys %iowait %idle
> > 0.03 0.00 2.69 3.08 94.20
> >
> > Device: tps Blk_read/s Blk_wrtn/s Blk_read
> > Blk_wrtn
> > sda 102.19 1011.95 309.16 5080
> > 1552
> > sdb 36.25 290.04 0.00 1456
> > 0
> >
> > avg-cpu: %user %nice %sys %iowait %idle
> > 0.12 0.00 2.78 4.01 93.09
> >
> > Device: tps Blk_read/s Blk_wrtn/s Blk_read
> > Blk_wrtn
> > sda 92.79 1463.73 1.60 7304
> > 8
> > sdb 29.86 235.67 4.81 1176
> > 24
> >
> > avg-cpu: %user %nice %sys %iowait %idle
> > 0.02 0.00 2.60 3.88 93.50
> >
> > Device: tps Blk_read/s Blk_wrtn/s Blk_read
> > Blk_wrtn
> > sda 128.80 2056.00 0.00 10280
> > 0
> > sdb 0.40 0.00 4.80 0
> > 24
> >
> > avg-cpu: %user %nice %sys %iowait %idle
> > 0.04 0.00 2.79 3.35 93.83
> >
> > Device: tps Blk_read/s Blk_wrtn/s Blk_read
> > Blk_wrtn
> > sda 162.28 1534.53 621.16 7688
> > 3112
> > sdb 0.00 0.00 0.00 0
> > 0
> >
> >
> > Thanks & Regards,
> >
> > -GnanaShekar-
> >
> >
> >
> > On 12/14/05, Smith, Albert <Albert.Smith@xxxxxxxxxxxxxxxxx> wrote:
> > >
> > > Without knowing more about the configuration of your system and of
> > the
> > > application there is very little go on. Can you provide more
> > details?
> > >
> > > Albert Smith
> > > Sr. Unix Systems Administrator
> > > HPCSA, RHCT
> > > Genex Services
> > > 440 E. Swedesford Rd.
> > > Wayne, PA 19087
> > > albert.smith@xxxxxxxxxxxxxxxxx
> > > (610) 964-5154
> > >
> > >
> > >
> > > > -----Original Message-----
> > > > From: redhat-list-bounces@xxxxxxxxxx
> > > > [mailto:redhat-list-bounces@xxxxxxxxxx] On Behalf Of unix
> > syzadmin
> > > > Sent: Tuesday, December 13, 2005 8:54 PM
> > > > To: redhat-list@xxxxxxxxxx
> > > > Subject: linux server slow.
> > > >
> > > > Hi,
> > > >
> > > > The users in my team are running tests for weblogic on linux
> > > > (RHEL AS4). We generally run test for weblogic on different
> > > > operating system and certify it.
> > > > They have complained that the linux server is slow. A test
> > > > that usually would take 30 mins is taking about 5 hours.
> > > > They have not faced this kind of slowness with any other
> > > > server (solaris, aix & hp-unix), even the earlier servers
> > > > that were running linux.
> > > >
> > > > I am new to troubleshooting performance problems. Please
> > suggest.
> > > >
> > > > Thanks & Regards,
> > > > -GnanaShekar-
> > > > --
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> > > >
> > >
> > >
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