linux server slow.

Wed Dec 14 03:57:32 UTC 2005

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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> >
>
>
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