linux server slow.
unix syzadmin
unixsyzadmin at gmail.com
Wed Dec 14 16:59:26 UTC 2005
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 360MB as the available RAM.
>
> RHEL AS4
> ========
> [root at 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 at juno.com> 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 at gmail.com
> > >
> > 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 at 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 at bangpcplin1 ~]#
> > >
> > > Also see a sample output of "iostat 5"
> > >
> > > [root at 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 at genexservices.com> 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 at genexservices.com
> > > > (610) 964-5154
> > > >
> > > >
> > > >
> > > > > -----Original Message-----
> > > > > From: redhat-list-bounces at redhat.com
> > > > > [mailto:redhat-list-bounces at redhat.com] On Behalf Of unix
> > > syzadmin
> > > > > Sent: Tuesday, December 13, 2005 8:54 PM
> > > > > To: redhat-list at redhat.com
> > > > > 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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