Re: linux server slow.

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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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