Question regarding memory on linux platforms

Customer recently upgraded from OCS 9i to 10g. The mail store database for OCS is a RAC 10.1.0.5 two node database. I have questions about which method is best to use to have a SGA bigger than 1.7GB on Linux x86 servers.
On the new OCS 10g mail store database, HWm enqueues are found to impact
database performance while the mail store receives very large quantities of
email in a short time. Oracle support and Enterprise Manager's ADDM has
recommended increasing the size of the SGA to help reduce HWm enqueues.
The max SGA size is currently 1648MB.
Servers are Red Hat 4 update 5. Each server in the two node RAC has 16GB of
RAM, with 4 processors (8 cores on each server). The kernel is the 2.6 SMP
kernel: Linux prcodb01.its.calpoly.edu 2.6.9-55.0.9.ELsmp #1 SMP Tue Sep 25 02:
17:24 EDT 2007 i686 i686 i386 GNU/Linux
Here are customer questions:
Oracle states that 1.7GB is the current limit with my systems current
configuration. When the Oracle documents reference 1.7GB, can I safely assume
that 1.7GB = 1740MB? I'd be safe using a max SGA size of 1739MB?
I've read Metalink notes 260152.1 and 329378.1. Looking at options listed in
260152.1, two options are listed for Red Hat 4.0, "configuration 3" and
"configuration 4" which required use of the hugemem kernel. Besides the
difference in the SGA sizes available between those two options, are there any
drawbacks from choosing one option over the other? Is there any drawback in
using the hugemem kernel over the plain smp kernel?

Hi,
For that question, Is there any drawback in using the hugemem kernel over the plain smp kernel ?
Please refer to NOTE 264236.1
Regards
Jason

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user9276238 wrote:
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Hello!
Hyper-V 3.0 is great! After it will be released, I think it will become the most popular hypervisor. But it remains a major drawback.
Nowhere announced support for dynamic memory for Linux VM on Hyper-V.
Planned at least in some perspective to implement this functionality?
Now we have to use two different hypervisors, as Hyper-V does not meet all the requirements of our customers.
Mark Tepterev
Oversun

~
~
Moved P.P.P.S.
Q from Brian Wong:
----- Original Message -----
From: "Brian Wong"
To: <[email protected]>
Sent: Thursday, March 06, 2014 9:24 AM
Subject: Re: Linux does not use more than the startup RAM under Hyper-V with dynamic memory enabled
On 3/6/2014 1:20 AM, Brian Wong wrote:
> The kernel is built with the full set of Hyper-V drivers, including the
> key "Microsoft Hyper-V Balloon Driver" as well as memory hot-add and
> hot-remove functionality. This is happening with both the Gentoo-patched
> 3.10.32 kernel and the vanilla 3.12.5 kernel. The host machine has a
> total of 24 GB of memory.
>
> For now, I am working around the issue by starting the VM with the
> startup memory set to the maximum and letting Hyper-V take the usused
> memory back when it is not in use. The VM will then get the extra memory
> when it needs it.
>
> Have I encountered a bug in the Hyper-V balloon driver?
>
Just a correction: the vanilla kernel version is 3.13.5, not 3.12.5.
Sorry for any confusion.
Brian Wong
http://www.fierydragonlord.com
----- Original Message -----
From: "Brian Wong"
To: <[email protected]>
Sent: Thursday, March 06, 2014 9:20 AM
Subject: Linux does not use more than the startup RAM under Hyper-V with dynamic memory enabled
I'm new to LKML, so please don't be too hard on me :)
I'm running Gentoo Linux under Microsoft Client Hyper-V on Windows 8.1
Pro, and I've noticed some odd behavior with respect to dynamic memory
(aka memory ballooning). The system will never use more than the startup
memory defined in the virtual machine's settings.
( VVM: typewriting error viRtual fixed by me, for best search in future )
For example, if I set the startup memory to 512 MB, and enable dynamic
memory with a minimum of 512 MB and a maximum of 8192 MB, the system
will never allocate than 512 MB of physical memory, despite Hyper-V
assigning more memory to the VM and the added memory being visible in
the output of "free" and "htop". Attempting to use more memory causes
the system to start paging to swap, rather than actually allocating the
memory above the startup memory assigned to the VM.
The kernel is built with the full set of Hyper-V drivers, including the
key "Microsoft Hyper-V Balloon Driver" as well as memory hot-add and
hot-remove functionality. This is happening with both the Gentoo-patched
3.10.32 kernel and the vanilla 3.12.5 kernel. The host machine has a
total of 24 GB of memory.
Brian Wong wrote On 3/6/2014 1:20 AM:
Just a correction: the vanilla kernel version is 3.13.5, not 3.12.5. )
For now, I am working around the issue by starting the VM with the
startup memory set to the maximum and letting Hyper-V take the usused
memory back when it is not in use. The VM will then get the extra memory
when it needs it.
Have I encountered a bug in the Hyper-V balloon driver?
Brian Wong
http://www.fierydragonlord.com
----- Original Message -----
From: "Victor Miasnikov"
To: [email protected]; "Brian Wong"
Cc: "Abhishek Gupta (LIS)" ( zzzzzzzzzzzzzzz (at) microsoft.com>; "KY Srinivasan" zzzzzzzzzzz (at) microsoft.com
Sent: Thursday, March 06, 2014 1:07 PM
Subject: Re: Linux does not use more than the startup RAM under Hyper-V with dynamic memory enabled RE: [PATCH 2/2]
Drivers: hv: balloon: Online the hot-added memory "in context" Re: [PATCH 1/1] Drivers: hv:
Hi!
Short:
Question to Linux kernel team:
may be patch
>>> [PATCH 2/2] Drivers: hv: balloon: Online the hot-added memory "in context"
can solve problems with dynamic memory hot add in Hyper-V VMs with Linux OS ?
Full:
BW>> .., if I set the startup memory to 512 MB, and enable dynamic
BW>> memory with a minimum of 512 MB and a maximum of 8192 MB,
BW>> the system will never allocate than 512 MB of physical memory
BW>>
BW>> Have I encountered a bug in the Hyper-V balloon driver?
BW>>
Unfortunately, It's long story . . . :-(
a)
I already ( on January 09, 2014 2:18 PM ) write about problems with "Online the hot-added memory" in "user space" see
P.P.S.
b)
See
Bug 979257 -[Hyper-V][RHEL6.5][RFE]in-kernel online support for memory hot-add
https://bugzilla.redhat.com/show_bug.cgi?id=979257
( Info from this topic may be interessant not only for RedHat users )
b2)
Detail about pathes related problem "Online the hot-added memory" in "user space" :
>>> [PATCH 2/2] Drivers: hv: balloon: Online the hot-added memory "in context"
>>>
>>>
>>> === 0001-Drivers-base-memory-Export-functionality-for-in-kern.patch
>>> . . .
>>> +/*
>>> + * Given the start pfn of a memory block; bring the memory
>>> + * block online. This API would be useful for drivers that may
>>> + * want to bring "online" the memory that has been hot-added.
>>> + */
>>> +
>>> +int online_memory_block(unsigned long start_pfn) { struct mem_section
>>> +*cur_section; struct memory_block *cur_memory_block;
>>>
>>> . . .
>>> ===
>>>
>>>
>>> ==
>>> . . .
>>> == 0002-Drivers-hv-balloon-Online-the-hot-added-memory-in-co.patch
>>>   . . .
>>>    /*
>>> -   * Wait for the memory block to be onlined.
>>> -   * Since the hot add has succeeded, it is ok to
>>> -   * proceed even if the pages in the hot added region
>>> -   * have not been "onlined" within the allowed time.
>>> +   * Before proceeding to hot add the next segment,
>>> +   * online the segment that has been hot added.
>>>     */
>>> - wait_for_completion_timeout(&dm_device.ol_waitevent, 5*HZ);
>>> + online_memory_block(start_pfn);
>>>
>>>   }
c)
Before apply patches ( see in P.S. about native udev-script) we are need use one of this methods:
[ VVM:   URL of this topic skipped ]
c1)
"/bin/cp method" by Nikolay Pushkarev :
Following udev rule works slightly faster for me (assuming that memory0 bank always in online state):
SUBSYSTEM=="memory", ACTION=="add", DEVPATH=="/devices/system/memory/memory[1-9]*",
RUN+="/bin/cp /sys$devpath/../memory0/state /sys$devpath/state"}}
( VVM : of course all need be place in one line, 2 line in this msg. -- only for good visual formating reasons )
c2)
udev rule using "putarg" by Nikolay Pushkarev :
Even "/bin/cp method" udev rule work time to time not as need :-(
As a result, Nikolay Pushkarev write a program putarg.c, that is even faster than "/bin/cp method" :
==
#include <stdio.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <string.h>
int main(int argc, char** argv) {
int i, fd;
if (argc < 2) return 0;
if ((fd = open(argv[1], O_RDWR)) < 0) return 1;
for (i = 2; i < argc; i++) {
    if (write(fd, argv[i], strlen(argv[i])) < 0) {
      close(fd);
      return i;
close(fd);
return 0;
==
The first argument - the name of the output file ,
and argument number 2 ( and all subsequent ( if exist ) ) - are text that are wiil be written in output file.
Compile source code to executable file by run command:
gcc -o putarg -s putarg.c
The resulting binary need be placed an accessible location , such as /usr/bin, or wherever you want.
Now udev rule using "putarg" can be written as :
SUBSYSTEM=="memory", ACTION=="add", RUN+="/usr/bin/putarg /sys$devpath/state online"
This complex solutions ( compiled file and udev-rule ) works exceptionally fast.
Best regards, Victor Miasnikov
Blog: http://vvm.blog.tut.by/
P.S.
Nikolay Pushkarev about standart udev-script :
Strange, that the native udev-script
SUBSYSTEM=="memory", ACTION=="add", ATTR{state}="online"
triggered somehow through time ( VVM: very often not work as need )
P.P.S.
----- Original Message -----
From: "Victor Miasnikov"
To: "Dan Carpenter"; "K. Y. Srinivasan" ; <[email protected]>
Cc: "Greg KH" ; <[email protected]>; <olaf (at) aepfle.de>; ""Andy Whitcroft"" <zzzzzzzzzzzz (at)
canonical.com>;
<jasowang (at) redhat.com>
Sent: Thursday, January 09, 2014 2:18 PM
Subject: RE: [PATCH 2/2] Drivers: hv: balloon: Online the hot-added memory "in context" Re: [PATCH 1/1] Drivers: hv:
Implement the file copy service
Hi!
> Is there no way we could implement file copying in user space?
For "file copy service" "user space" may be pretty good
But I ( and other Hyper-V sysadmin) see non-Ok ( in "political correct" terminalogy) results with "hv: balloon: Online
the hot-added memory" in "user space"
==
[PATCH 2/2] Drivers: hv: balloon: Online the hot-added memory "in context"
==
What news? Roadmap?
Best regards, Victor Miasnikov
Blog: http://vvm.blog.tut.by/
~
~
~
~
~
~
~
~
~
----- Original Message -----
From: "KY Srinivasan"
To: "Victor Miasnikov"; [email protected]; "Brian Wong"
Cc: "Abhishek Gupta (LIS)"
Sent: Thursday, March 06, 2014 1:23 PM
Subject: RE: Linux does not use more than the startup RAM under Hyper-V with dynamic memory enabled RE: [PATCH 2/2]
Drivers: hv: balloon: Online the hot-added memory "in context" Re: [PATCH 1/1] Drivers: hv:
> -----Original Message-----
> From: Victor Miasnikov
> Sent: Thursday, March 6, 2014 3:38 PM
> To: [email protected]; Brian Wong
> Cc: Abhishek Gupta (LIS); KY Srinivasan
> Subject: Re: Linux does not use more than the startup RAM under Hyper-V
> with dynamic memory enabled RE: [PATCH 2/2] Drivers: hv: balloon: Online
> the hot-added memory "in context" Re: [PATCH 1/1] Drivers: hv:
>
Victor,
I will try to get my in-context onlining patches accepted upstream.
K. Y

Minimum Hardware Requirement for Siebel CRM 8.0 for Linux Platform?

Hi,
What are the minimum hardware requirement for Siebel CRM 8.0 for Linux OS?

Following are the Linux Platforms supported & officially listed in Siebel 8 Requirement Doc:
Red Hat Enterprise Linux 4
Siebel Gateway Name Server
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PIII XEON @ 500 MHz with 256 MB memory
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Novell SUSE Linux Enterprise Server 9
Siebel Gateway Name Server
PIII XEON @ 500 MHz with 256 MB memory
Siebel Server
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HI Experts,
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Hi,
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If 533 is not possible i guess i'll just buy additional 1GB of 333MHz DDR.
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Hello
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Error message: ORA-27125: unable to create shared memory segment Linux-x86_

Hi,
I am doing an installtion of SAP Netweaver 2004s SR3 on SusE Linux 11/Oracle 10.2
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Thanks,
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Hi Ratnajit,
I am too facing the same error but my ORACLE is not starting,
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cat /etc/sysctl.conf
# created by /sapmnt/pss-linux/scripts/sysctl.pl on Wed Oct 23 22:55:01 CEST 2013
fs.inotify.max_user_watches = 65536
kernel.randomize_va_space = 0
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net.ipv4.conf.default.promote_secondaries = 1
net.ipv4.icmp_echo_ignore_broadcasts = 1
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net.ipv4.neigh.default.gc_thresh2 = 1024
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net.ipv6.neigh.default.gc_thresh1 = 256
net.ipv6.neigh.default.gc_thresh2 = 1024
net.ipv6.neigh.default.gc_thresh3 = 4096
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kernel.shmmni = 4096
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fs.file-max = 65536
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net.core.rmem_max = 262144
net.core.wmem_default = 262144
net.core.wmem_max = 262144
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#<domain>      <type> <item>         <value>
#*               soft    core            0
#*               hard    rss             10000
#@student        hard    nproc           20
#@faculty        soft    nproc           20
#@faculty        hard    nproc           50
#ftp             hard    nproc           0
#@student        -       maxlogins       4
# Added for SAP on 2012-03-14 10:38:15 UTC
#@sapsys          soft    nofile          32800
#@sapsys          hard    nofile          32800
#@sdba            soft    nofile          32800
#@sdba            hard    nofile          32800
#@dba             soft    nofile          32800
#@dba             hard    nofile          32800
# End of file
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#               soft    nproc   2047
#               hard    nproc   16384
#               soft    nofile 1024
#               hard    nofile 65536
@sapsys                 soft   nofile          131072
@sapsys                 hard   nofile         131072
@sdba                  soft nproc          131072
@sdba                  hard   nproc         131072
@dba                 soft    core           unlimited
@dba                 hard     core          unlimited
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MemFree:        29890028 kB
Buffers:           82588 kB
Cached:          1451480 kB
SwapCached:            0 kB
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Active(anon):    1136212 kB
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KernelStack:        2840 kB
PageTables:        10544 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:    50061392 kB
Committed_AS:    1364300 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      342156 kB
VmallocChunk:   34359386308 kB
HardwareCorrupted:     0 kB
AnonHugePages:    622592 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:       67584 kB
DirectMap2M:    33486848 kB
Please let me know where i am going wrong.
Wat thing basically u check on /proc/meminfo command
Regards,
Dipak

Basic question regarding SSIS 2010 Package where source is Microsoft Excel 97-2005 and there is no Microsoft office or Excel driver installed in Production

Hi all,
I got one basic question regarding SSIS 2010 Package where source is Microsoft Excel 97-2005. I wanted to know How this package works in production where there is no Microsoft office or Excel driver installed. To check that there is excel driver installed
or not, I followed steps: Start-->Administrative Tools--> Data Sources(ODBC)-->Drivers and I found only 2 drivers one is SQL Server and another one is SQL Server Native Client 11.0.
Windows edition is Windows Server 2008 R2 Enterprise, Service Pack-1 and System type is 64-bit Operating System.
We are running this package from SQL Server Agent and using 32-bit (\\Machine_Name\d$\Program Files (x86)\Microsoft SQL Server\110\DTS\Binn\DTExec.exe /FILE "\\Machine_Name\d$\ Folder_Name\EtL.dtsx" /CONFIGFILE "\\Machine_Name\d$\Folder_Name\Config.dtsConfig"
/MAXCONCURRENT " -1 " /CHECKPOINTING OFF /REPORTING E) to run this package. I opened the package and tried to find out what connection we have used and found that we have used "Excel Connection Manager" and ConnectionString=Provider=Microsoft.Jet.OLEDB.4.0;Data
Source=F:\Fares.xls;Extended Properties="EXCEL 8.0;HDR=YES"; and source is ‘Excel Source’
I discussed with my DBA and He said that SSIS is having inbuilt Excel driver but I am not convinced.
Could anyone please clear my confusion/doubt?
I have gone through various links but my doubt is still not clear.
Quick Reference:
SSIS in 32- and 64-bits
http://toddmcdermid.blogspot.com.au/2009/10/quick-reference-ssis-in-32-and-64-bits.html
Why do I get "product level is insufficient..." error when I run my SSIS package?
http://blogs.msdn.com/b/michen/archive/2006/11/11/ssis-product-level-is-insufficient.aspx
How to run SSIS Packages using 32-bit drivers on 64-bit machine
http://help.pragmaticworks.com/dtsxchange/scr/FAQ%20-%20How%20to%20run%20SSIS%20Packages%20using%2032bit%20drivers%20on%2064bit%20machine.htm
Troubleshooting OLE DB Provider Microsoft.ACE.OLEDB.12.0 is not registered Error when importing data from an Excel 2007 file to SQL Server 2008
http://www.mytechmantra.com/LearnSQLServer/Troubleshoot_OLE_DB_Provider_Error_P1.html
How Can I Get a List of the ODBC Drivers that are Installed on a Computer?
http://blogs.technet.com/b/heyscriptingguy/archive/2005/07/07/how-can-i-get-a-list-of-the-odbc-drivers-that-are-installed-on-a-computer.aspx
Thanks Shiven:) If Answer is Helpful, Please Vote

Hi S Kumar Dubey,
In SSIS, the Excel Source and Excel Destination natively use the Microsoft Jet 4.0 OLE DB Provider which is installed by SQL Server. The Microsoft Jet 4.0 OLE DB Provider deals with .xls files created by Excel 97-2003. To deal with .xlsx files created by
Excel 2007, we need the Microsoft ACE OLEDB Provider. SQL Server doesn’t install the Microsoft ACE OLEDB Provider, to get it we can install the
2007 Office System Driver: Data Connectivity Components or
Microsoft Access Database Engine 2010 Redistributable or Microsoft Office suit.
The drivers listed in the ODBC Data Source Administrator are ODBC drivers not OLEDB drivers, therefore, the Excel Source/Destination in SSIS won’t use the ODBC driver for Excel listed in it by default. On a 64-bit Windows platform, there are two versions
of ODBC Data Source Administrator. The 64-bit ODBC Data Source Administrator is C:\Windows\System32\odbcad32.exe, while the 32-bit one is C:\Windows\SysWOW64\odbcad32.exe. The original 32-bit and 64-bit ODBC drivers are installed by the Windows operating system.
By default, there are multiple 32-bit ODBC drivers and fewer 64-bit ODBC drivers installed on a 64-bit platform. To get more ODBC drivers, we can install the 2007 Office System Driver: Data Connectivity Components or Microsoft Access Database Engine 2010 Redistributable.
Besides, please note that 2007 Office System Driver: Data Connectivity Components only install 32-bit ODBC and OLEDB drivers because it only has 32-bit version, but the Microsoft Access Database Engine 2010 Redistributable has both 32- bit version and 64-bit
version.
If you have any questions, please feel free to ask.
Regards,
Mike Yin
TechNet Community Support

Hi, I want to downgrade from OSX LEOPARD to OSX TIGER but I have a few questions regarding this. My iMac is originally from 2007 it came preloaded with tiger. I have original install tiger discs version 10.4.10. Is it safe to downgrade or not please help

Hi, I want to downgrade from OSX LEOPARD to OSX TIGER but I have a few questions regarding this. My iMac is originally from Sep 2007 it came preloaded with tiger. I have original install (2) tiger discs version 10.4.10. I want to know if it is safe and what are the necessary steps to do so. Also by downgrading im wondering if a lot of apps nowadays support tiger for example I have photoshop version 5 and 4 these are very important to me. One last question does anyone know of any reliable virus protection for mac that doesnt slow down your computer? because I have read that a lot of them do so. If anyone can help me I would greatly appreciate it! Here are the specs for my iMac
Model Name:
iMac
Model Identifier:
iMac7,1
Processor Name:
Intel Core 2 Duo
Processor Speed:
2 GHz
Number Of Processors:
1
Total Number Of Cores:
2
L2 Cache:
4 MB
Memory:
2 GB
Bus Speed:
800 MHz

Most of the time a perception of general slow performance is the result of installing third party junk alleged to speed up, "clean" or "optimize" your Mac, or to look for viruses that don't exist. Ideally you would know what you installed so you can uninstall it, but if you don't know or aren't sure there are techniques such as Safe Mode and creating a temporary user account to confirm that suspicion.
If you open Activity Monitor it may show a process, or processes, that occupy a lot of your system's time.
Slowness confined solely to web browser activity is often the result of an inexorable progress toward websites that demand ever more processor-intensive tasks. If your slow performance is strictly limited to web browsing, you might try disabling Flash by either uninstalling it, or use utilities such as ClickToFlash that allow you to control what Flash content gets loaded. Flash in itself is not inherently evil, but there is nothing to stop websites or the advertisers who pay for them from writing horrible Flash code that can do everything from hogging 100% of your CPU's time to causing random crashes. You can watch Activity Monitor as in the above to correlate these troublesome web pages with performance degradation.
You are correct; if your computer shipped with Tiger you may certainly revert to it. I forgot that Tiger was shipping on new Macs as recently as five years ago. To downgrade it would be necessary to completely erase your hard disk and boot with the Tiger installation DVD, followed by installing it anew. Such drastic measures are not necessary and you are unlikely to be satisfied with the results anyway.
Assuming your system is free of third party parasitic junk attached to OS X in an ill-conceived attempt to improve upon it, that your hard disk drive is sound and the boot volume has enough free space to work with, by far the best performance-enhancing improvement would be to add more memory. Buy as much as your computer can use and that you can afford. 2 GB is not that much any more.
Read the following for some recommended troubleshooting techniques from Apple:
General purpose Mac troubleshooting guide: Isolating issues in Mac OS X
Creating a temporary user to isolate user-specific problems: Isolating an issue by using another user account
Memory limitations: Using Activity Monitor to read System Memory and determine how much RAM is being used
Identifying resource hogs and other tips: Runaway applications can shorten battery runtime
Starting the computer in "safe mode": Mac OS X: What is Safe Boot, Safe Mode?

Some question regarding requirements in context of SAP XI

Hello!
I have few questions regarding Relational Database, Network Archtecture and Platform Support requirements in context of SAP XI. Can someone help by answering the questions, if possible with Yes/No (and short explanation)
<b>a) Does your system run native to the Oracle 10g RDBMS (RAC) and database tools? If not, please explain the databases and tools supported (Yes/No)
b) database accept binary-large-objects (BLOBs) and be referenced via the relational engine (Yes/No)
c) Deployable without using any fixed IP addresses (taking advantage of DHCP address resolution) (Yes/No)
d)software supported on HP-UX 11.i V2 (r6) on Itanium. (Yes/No)
e) Software supported on OS clustered servers (If mutliple products, please indicate if all are support or list areas where clustering may not be recommended and why) (Yes/No)</b>
Thank you very much!
Regards
A. Henke

Hi Axel,
I've just found your question by accident and would like to know whether you have already implemented 10gRAC in SAP environment?
regards
Barthez

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