RAC 10 and Linux?

Hi,
We are considering a High-availability solution with RAC 10. We first though of Solaris, but it would save money if we could go for a Linux based solution. My wondering is, how proven is the combination of RAC and Linux for HA-solutions? Cons and pros? Scalability? Total cost of ownership?
All feedback on this one is welcome.
Rgds
Kjell

For techcnical clarifications kindly go through this one
http://www.puschitz.com/InstallingOracle10gRAC.shtml
There is one interesting document states "Learn how to set up and configure an Oracle RAC 10g Release 2 development cluster for less than US$1,800. " by by Jeffrey Hunter .
http://www.oracle.com/technology/pub/articles/hunter_rac10gr2.html
Thanks
--Raman

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hello,
we are setting up Oracle 9i RAC on Redhat Linux 8.0.
The problem we are having is at the point of sharing the raw partition and mounting the raw partition via nfs.
so we have two dell systems called linuxa and linuxb.
the partitions are made on linuxa (/dev/hda6...) and the raw command is used to bind the raw partition to the device (raw /dev/raw/raw1 /dev/hda6)
now when i run the command to mount
(mount -tnfs linuxa:/dev/raw/raw1 /mnt) i am getting an error
i know this problem isn't directly related with oracle but the whole point in doing this is to install oracle 9i on a shared device between the two system.
i have looked online everywhere for documentation and haven't come up with anything.
Any help will be greatly appreciated!
sara

I don't know that you can use nfs to share a raw partition. This also defeats the idea of the cluster - If a host dies, the disk storage must still be viewable from the other node.
The raw device must be viewable to both hosts. Oracle controls which host is writing to the disk at any instant.
Use the firewire method or use two scsi cards (terminated, with different scsi id's) to a SHARED scsi disk (unterminated).
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Oracle RAC with Oracle Linux Based RAC Applications

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Oracle 11gR2 2 node RAC on Oracle Linux - can't discover

Hi folks,
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[root@rac1 send_targets]# iscsiadm -m discovery -t sendtargets -p openfiler
[root@rac1 send_targets]# ping openfiler
PING openfiler (192.168.1.11) 56(84) bytes of data.
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64 bytes from openfiler (192.168.1.11): icmp_seq=2 ttl=64 time=0.224 ms
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64 bytes from openfiler (192.168.1.11): icmp_seq=4 ttl=64 time=0.211 ms
^C
--- openfiler ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3000ms
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iscsid (pid 2446) is running...
[root@rac1 send_targets]# uname -a
Linux rac1.mydomain 2.6.32-100.26.2.el5 #1 SMP Tue Jan 18 20:11:49 EST 2011 x86_64 x86_64 x86_64 GNU/Linux
[root@rac1 send_targets]#
If possible to just direct me to some link, I'm following this: http://www.oracle.com/technetwork/articles/hunter-rac11gr2-iscsi-088677.html#8
But it is not telling, if it doesn't discover ... then what?
Thanks in advance.

Hi ,
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Also try giving the ip address of openfiler instead of giving the hostname
Regards,

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Do anybody use datafiles with more than 2 G sizes (raw devices)?
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I created such a datafile 6 G in size. Tried to use it. It seems like
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if u use raw devices
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Has anyone tried the installation with the New Software Updates Option?
I will install 11gR2 RAC Grid and I plan to do the following steps:
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2) Do all the configuration with OUI
3) Create ASM disks
4) Install Oracle Database 11.2.0.2 Software Only
5) Apply Oracle Recommended Patches 11.2.0.2.2 (12311357) and 12431716. (ref. MOS doc [ID 756671.1])
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I would not like to do a "Software only" install of GI and then apply the patches because later I would have to manually do all the configuration steps.
If I use the OUI Software Updates Option to apply the patches, will OUI do all the patching and then let me configure GRID with OUI ?
Quote from Oracle® Grid Infrastructure Installation Guide 11g Release 2 (11.2) for Linux - Part Number E17212-11:
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Thanks

Hi,
You can download Latest Updates And Patches Using using option -downloadUpdates
./runInstaller -downloadUpdatesYou can use this note:
*How To Download The Latest Updates And Patches Using 11.2.0.2 OUI [ID 1295074.1]*
Don't miss it ..
*Error: INS-20704 While Installing 11.2.0.2 with "Use pre-downloaded software updates" Option [ID 1265270.1]*
Note : Please make sure that user downloading the patches updates have the proper/correct permission to download the patch updates from MOS ( My Oracle Support).
Do not use the /tmp/oraInstall* directories for the download location. Unpublished bug 9975999
Documentation explaining ...
4.5.1 Running Oracle Universal Installer
Downloading Updates Before Installation
http://download.oracle.com/docs/cd/E11882_01/install.112/e16763/inst_task.htm#BABJGGJH
Regards,
Levi Pereira

ASCII-EBCDIC convertion between z/Os and Linux

Hi experts, we are migrating our landscape to z/Os (DB+ASCS) and Linux (PAS). We have our GLOBALHOST on z/Os but we are experimenting some problems when we try to install our application servers because the conversion between platforms.
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Does any of you have this kind of installtion that could help us to set this parameters ok?
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Regards
gustavo

First, yes, we have z/OS systems programmers and DBAs with specific knowledge of DB2 z/OS. One of the reasons we initially went with the Z platform when we implemented SAP was that our legacy systems ran there for many years and our company had a lot of Z knowledge and experience. zSeries was one of our "core competencies".
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We also chose the Z platform because of the touted "near-continuous availability" which sounded very good. Let me assure you, however, that although SAP has been making great strides with things like the enhancement pack installer, at present you will never have zero downtime running SAP on any platform. Specifically you will still have planned downtime for SAP kernel updates and support packs or enhancement packs, period. The "near-continuous availability" in this context refers to zero unplanned downtime. In my experience this is not the case either. We had several instances of unplanned downtime, the most recent had to do with issues when the CECs got to 100% CPU utilization for a brief period of time and could not free some asinine small memory area that caused the entire sysplex to pause all LPARs until it was dealt with(yes, this could be dealt with using system automation but our Z folks would prefer to deal with these manually since each situation can be different). We worked with IBM on a PMR for several months, but our eventual "workaround" was much better. We stopped running our DB2 instances as active/active and never had the problem again. We chose this "workaround" because we knew we were abandoning the platform and any of the test fixes from IBM required a rolling update of z/OS in all LPARs (10 total at the time), which is a major hassle, especially when you do it several times applying several different fixes until the problem is finally solved.
We also experienced some issues with DB2 z/OS itself. In one case, some data in a table in production got corrupted (yikes!!) SAP support helped us correct the data based on our QA system and IBM delivered a PTF (or maybe it was a ++APAR) to correct the problem. We also had several instances of strange poor performance in ERP or BI that were solved with a PTF or by using some special RUNSTATS output by some IBM DB2 tool our DBAs ran when we gave them the "bad" query. Every time we updated DB2 z/OS with an RSU felt like a craps shoot. Sometimes there were no issues revealed during testing, other times major issues were uncovered. This made us very hesitant when it came to patching DB2 and also made us stay well behind currently available maintenance so we could let other organizations identify problems.
Back to the topic of downtime related to DB2 z/OS itself, we know another company which runs SAP on Z that takes several hours of downtime each week (early Sunday morning I think) to REORG some large BLOB tables(if you're not in the monthly conference call for SAP on DB2 z/OS organizations, I suggest you join in). The need for RUNSTATS and REORGs to be dealt with explicitly (typically once a day for RUNSTATs and once a week for REORGs, at least for us) is a major negative of the platform, in my opinion. It is amazing what "proper" RUNSTATS can do to a previously poor performing query(hours reduced to seconds!). Also, due to the way REORGs are handled in DB2 z/OS, you'll need a lot of extra disk space for the image copies which get created. In our experience you need enough temp disk to hold the shadow copy of the largest table being REORGd and the image copies of the largest tables that are REORGd in the same time period. I recall that the image copies can be migrated to tape or virtual tape to free the image copy space back up using a periodic job, but it was a huge amount of trial and error to properly size this temp disk space, especially when the tables requiring a REORG are not the same week-to-week. We heard that with DB2 z/OS v10 that RUNSTATS and REORGs will be dealt with automatically by DB2, but I do not know if it has even been certified for SAP yet(based on recent posts in this forum it would appear not). Even when it is, I would not recommend going to it immediately(we made this mistake when DB2 z/OS v9 was certified and suffered for months getting bugs with SAP and DB2 interoperability fixed). Also, due to the way that REORGs work on BLOB tables, there will be a period of table unavailability. The caused us some issues/headaches. There are some extra REORG parameters you can set, but these issues are still always a possibility and I think that is why the company mentioned previously just took the weekly downtime to finish the REORGs on their large BLOB tables. They are very smart folks that are very experienced with zSeries and they engaged IBM experts for assistance to try and perform the REORGs online and yet they still take the downtime to perform the BLOB REORGs offline. In contrast, these periodic database tasks do not require our Basis team to do anything with SQLServer and do not cause our end-users grief when a table is unavailable.
Our reasons for moving platforms (which, let me assure you was a major undertaking and was considered long and hard) were based on 3 things:
1. Complexity
2. Performance
3. Cost
When I speak of complexity, let me give you some data... There was a time when ~50% of all of the OSS messages the Basis team opened with SAP were in the BC-DB-DB2 category. In contrast, I think we've opened 1 or 2 OSS messages in the BC-DB-MSS category ever. Many of the OSS messages for DB2 z/OS resulted in a fix from either SAP or from IBM. We've had seveal instances of applying a PTF, ++APAR, or RSU to z/OS and/or DB2 which fixed serious "unable to perform a job function" problems with SAP. We've yet to have to apply a single update to Windows or SQLServer to fix an issue with SAP.
To summarize... Comparing our previous and current SAP platforms, the performance was slower, the cost higher, and the complexity much higher. I have no doubt (especially with the newer Z10 and zEnterprise 196) that we could certainly have built a zSeries SAP solution which performed on par with what we have now, but.... I could not even fathom a guess as to the cost. I suspect this is why you don't see any data for the standard SAP SD benchmark on zSeries.
I suspect you're already committed to the platform since deploying a Z machine, even in a lab/sandbox environment isn't as easy as going down to your local computer dealer and buying a $500 test server to install on, but... If you wanted to run SAP on DB2 I would suggest looking at DB2 LUW on either X86_64 Linux or on IBM's pSeries platform.
Brian

DB creation failure [RAC, Suse and 9i]

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The post doesn't provide enough data to give you a definate answer, however, we cover the details of RAC installation and configuration in our new book, check it out at:
http://www.dba-oracle.com/bp/bp_book1_rac.htm
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The paper explains how to start a cluster on a single host in a single Linux VM on VMware.
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userLynx wrote:
I have an oracle database (10.2) and I have a query that needs to compare data on the Oracle database to data on a MS SQL server DB. I'm using a DB Link between the two databases.
How would I compare the date fields?
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My query is as follows:
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pmv_rqst_corp_id,
pmv_rqst_source,
'G',
pmv_css_acct_no,
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AND eq.marketer_id = mkt_seq_no
AND pmv_service_type IN ('G','D')
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Why difference in Solaris and Linux

Hi,
The following program is giving results diferently when I am executing using g++ compiler in Solaris and Linux.
Why it is so.
here is the code:
#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include <stdlib.h>
int main( void )
size_t size;
char *buf;
if ( ( buf = (char *)malloc(10 *sizeof(char))) == NULL)
exit (1);
size = sizeof( buf );
strcpy(buf, "HelloWorld");
printf("\n Address is : %u String is : %s size : %d ", buf, buf,size);
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exit ( 1);
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Linux:
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Thanks
Venkat

Hi,
The following program is giving results diferently
when I am executing using g++ compiler in Solaris
and Linux.
Why it is so.
here is the code:
#include <stdio.h>
#include <string.h>
#include <malloc.h>
#include <stdlib.h>
int main( void )
size_t size;
char *buf;
if ( ( buf = (char *)malloc(10 *sizeof(char))) == NULL)
exit (1);
size = sizeof( buf );The size you get here is the size of buf, which is the size of a pointer, not the size of what buf points to. sizeof(*buf) would give you size of a char, the type (not the object) that buf points to.
There is no portable way to find out the number of bytes allocated on the heap if you are give only a pointer to the memory. You have to remember the size some other way..
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printf("\n Address is : %u String is : %s size :
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printf("\n Address is : %u String is : %s\n", buf, buf);
free( buf);
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Instead of asking why you get different results on different platforms, you should be asking why the program doesn't crash on all platforms. :-)
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Hi,
I need the steps to export the oracle 10g database from AIX server to AIX server and LINUX server.
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