|
|
Sponsored Content
Top Forums
UNIX for Advanced & Expert Users
Gurus needed to diagnose severe performance degradation
Post 302349670 by DBA_guy on Tuesday 1st of September 2009 01:23:09 PM
09-01-2009
Gurus needed to diagnose severe performance degradation
Hi everyone, newbie forum poster here. I'm an Oracle DBA and I require some guidance from the Unix gurus here about how to pinpoint where a problem is within a Solaris 9 system running on an 8 CPU Fujitsu server that acts as our Oracle database server. Our sysadmins are trying their best to resolve the issue but none of us are 100% sure where the issue resides - I'm hoping people here can help shed some light on things or help point us in a new/better direction.
Environment:
Server: Fujitsu P650, (7 cpu in use, 48GB RAM) Solaris 9 Generic_122300-22 sun4us sparc FJSV,GPUZC-M
Old Storage: EMC Clarion fibre attached storage
New Storage: NetApp storage, 3040 Controller, NFS mounted volumes via multi trunked1GB ethernet connection (not round robin)
Database: Oracle 9i
Problem: We are migrating our storage from fibre EMC to NFS NetApp and are encountering huge performance degradation... pin pointing where the problem is has been problematic. (As a DBA I seriously questioned this move, but this point is now moot as the money has been spent and we have to deal with it.)
Detail: We've been slowly migrating our databases off of the fibre EMC to NFS NetApp Some of our high performance databases struggled mightily on the NetApp storage and there has been lots of finger pointing as to why.
Symptoms: Over time (hours to days) database jobs and response times nosedive - lots of hooting and hollering from the business
System response time can be extremely slow.. simple commands “df -h” “ls” slow in responding. However system load is typically minimal, almost non-existant. (low 1's and 2's for load) however at times we can see high kernel processing times.
Advice from our sysadmins: Current advice from one admin is that the Fujitsu server is older hardware that is not built for this kind of transaction processing. They have been monitoring “counters on the PCI bus (66MHz) and are seeing overflow issues” (forgive me if this isn't well articulated) and noticing that it “has problems keeping up”. Another sys admin feels that the PCI bus has nothing to do with it and that it is networking related: specifically that while we have trunking in place to the NetApp filer, it is not round robin and as a result the pipe from the server to the storage is too small for any given transaction (which from Oracle will necessarily be single threaded) Having conflicting reports from the sys admins is not great.
Are there any recommendations on where the problem possibly lies? (obviously this is very difficult to do from a few paragraphs). Or perhaps more realistically, aside from looking at top/prstat to see low load, iostat to see ok I/O processing times, sysadmins checking counters on a PCI bus, is there any other tools, either available in Solaris or 3rd party that can be used to definitively say “AHA! That is definitely where the bottleneck is!”
Many thanks in advance..
Environment:
Server: Fujitsu P650, (7 cpu in use, 48GB RAM) Solaris 9 Generic_122300-22 sun4us sparc FJSV,GPUZC-M
Old Storage: EMC Clarion fibre attached storage
New Storage: NetApp storage, 3040 Controller, NFS mounted volumes via multi trunked1GB ethernet connection (not round robin)
Database: Oracle 9i
Problem: We are migrating our storage from fibre EMC to NFS NetApp and are encountering huge performance degradation... pin pointing where the problem is has been problematic. (As a DBA I seriously questioned this move, but this point is now moot as the money has been spent and we have to deal with it.)
Detail: We've been slowly migrating our databases off of the fibre EMC to NFS NetApp Some of our high performance databases struggled mightily on the NetApp storage and there has been lots of finger pointing as to why.
Symptoms: Over time (hours to days) database jobs and response times nosedive - lots of hooting and hollering from the business
System response time can be extremely slow.. simple commands “df -h” “ls” slow in responding. However system load is typically minimal, almost non-existant. (low 1's and 2's for load) however at times we can see high kernel processing times.Advice from our sysadmins: Current advice from one admin is that the Fujitsu server is older hardware that is not built for this kind of transaction processing. They have been monitoring “counters on the PCI bus (66MHz) and are seeing overflow issues” (forgive me if this isn't well articulated) and noticing that it “has problems keeping up”. Another sys admin feels that the PCI bus has nothing to do with it and that it is networking related: specifically that while we have trunking in place to the NetApp filer, it is not round robin and as a result the pipe from the server to the storage is too small for any given transaction (which from Oracle will necessarily be single threaded) Having conflicting reports from the sys admins is not great.
Are there any recommendations on where the problem possibly lies? (obviously this is very difficult to do from a few paragraphs). Or perhaps more realistically, aside from looking at top/prstat to see low load, iostat to see ok I/O processing times, sysadmins checking counters on a PCI bus, is there any other tools, either available in Solaris or 3rd party that can be used to definitively say “AHA! That is definitely where the bottleneck is!”
Many thanks in advance..
|
|
9 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
I wish to substituite a string on each line but ONLY if it appears within double-quotes:
this_string="abc#def#geh" # Comment here
I wish to change the "#" characters within the double quoted string to "_":
this_string="abc_def_geh" # Comment here
... but as you see, the "comment" hash... (2 Replies)
Discussion started by: Simerian
2 Replies
2. Solaris
Hi All,
How does Solaris 9/10 alert the server? Where do you get the error on the server?
Is there some kind of verifying of errors (like in AIX, CERTIFY resources or diagnose)?
Please let me know.
Thanks,
itik (4 Replies)
Discussion started by: itik
4 Replies
3. Red Hat
Dear All,
I am facing a unknown error, I start the Linux (RHEL 4 update 6) as usual.
After starting the various services(like network,sendmail,portmap etc) a error appears suddenly.
The error looks like :
Post_create: setxattr failed, rc=28 (dev=hda2 ino=772685)
Post_create: setxattr... (2 Replies)
Discussion started by: akhtar.bhat
2 Replies
4. Shell Programming and Scripting
Hi,
I have a script that calls an external program to perform some calculations and then I read with "grep" and "sed" values from the output files. I've noticed that performance of KSH93 degrades with every iteration. The output files are all the same size, so I don't understand why after the... (2 Replies)
Discussion started by: i.f.schulz
2 Replies
5. Shell Programming and Scripting
How would i check for following?
1)open ports in my linux machine.
2)Hard disk read speed.
3)Hard disk write speed. (2 Replies)
Discussion started by: pinga123
2 Replies
6. AIX
Hi, say for example if there is high disk write IO in one disk (detected from NMON), how to we identify what processes is writing on that particular disk? (3 Replies)
Discussion started by: ngaisteve1
3 Replies
7. Shell Programming and Scripting
Background
-------------
The Unix flavor can be any amongst Solaris, AIX, HP-UX and Linux. I have below 2 flat files.
File-1
------
Contains 50,000 rows with 2 fields in each row, separated by pipe.
Row structure is like Object_Id|Object_Name, as following:
111|XXX
222|YYY
333|ZZZ
... (6 Replies)
Discussion started by: Souvik
6 Replies
8. Shell Programming and Scripting
i have learnt a little bit of shell scripting but not alot. i want to write a script to diagnose the network using ping and another script to traceroute. how would i do this? (6 Replies)
Discussion started by: stefanere2k9
6 Replies
9. AIX
I need to install python 3.3.0 to AIX 6.1
I created folder where I want to install
I downloaded files archive from python official website
I extracted it into new folder and ran;
1)./configure --with-gcc="xlc_r" --with-cxx="xlC_r" --disable-ipv6 --prefix=my_folder CXX=xlC_r... (2 Replies)
Discussion started by: AIX_30
2 Replies
LEARN ABOUT SUSE
apache::session::oracle
Session::Oracle(3) User Contributed Perl Documentation Session::Oracle(3) NAME
Apache::Session::Oracle - An implementation of Apache::Session SYNOPSIS
use Apache::Session::Oracle; #if you want Apache::Session to open new DB handles: tie %hash, 'Apache::Session::Oracle', $id, { DataSource => 'dbi:Oracle:sessions', UserName => $db_user, Password => $db_pass, Commit => 1 }; #or, if your handles are already opened: tie %hash, 'Apache::Session::Oracle', $id, { Handle => $dbh, Commit => 1 }; DESCRIPTION
This module is an implementation of Apache::Session. It uses the Oracle backing store and no locking. See the example, and the documentation for Apache::Session::Store::Oracle for more details. USAGE
The special Apache::Session argument for this module is Commit. You MUST provide the Commit argument, which instructs this module to either commit the transaction when it is finished, or to simply do nothing. This feature is provided so that this module will not have adverse interactions with your local transaction policy, nor your local database handle caching policy. The argument is mandatory in order to make you think about this problem. This module also respects the LongReadLen argument, which specifies the maximum size of the session object. If not specified, the default maximum is 8 KB. AUTHOR
This module was written by Jeffrey William Baker <jwbaker@acm.org>. SEE ALSO
Apache::Session::File, Apache::Session::Flex, Apache::Session::DB_File, Apache::Session::Postgres, Apache::Session perl v5.12.1 2007-09-28 Session::Oracle(3)