High I/O wait observed in Linux based Oracle Database Server

Hi,
We have just migrated Oracle Database from Solaris Server to Linux VM [ESX] server.
We have observed that there is high I/O wait issues while database query is running on Linux VM, which was ideally zero in case of Solaris. The same Database was running with no i/o wait on solaris physical server.
In the same ref.I would like to below points.
- Recommendations for running Oracle on VM based Linux.
- Recommendations from ESX Host side
Please suggest.

user558914 wrote:
We have just migrated Oracle Database from Solaris Server to Linux VM [ESX] server.
We have observed that there is high I/O wait issues while database query is running on Linux VM, which was ideally zero in case of Solaris. The same Database was running with no i/o wait on solaris physical server.What did you expect? A virtualised I/O subsystem to respond and perform like a real one?
That would a very unrealistic expectation. And as comparisons go, as sensible as comparing the taste of an apple with the odour of the colour blue.
Forget about comparisons. Only marketing, sales and the idiot believe the cr@p that introducing several s/w layers between the the target (e.g. sector on spinning rust) and the destination (e.g. Oracle) makea the path between target and destination, faster.
To optimise the virtualised target, you need to make the path as short as possible. If your virtual disk is for example a file on a cooked file system on the host, then you are introducing the host's complete I/O layer for accessing that virtual drive. If your virtual disk is an actual (raw) partition or drive on the host, then path is faster - passing through the host kernel as direct I/O and bypassing the host's cache and file system drivers.
I suggest that when you setup your virtualised environment, you do proper stress testing of the various configurations of a virtualised I/O subsystem, using something like fio.

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Thanks.

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readahead
smartmontools
yum-updatesd
irqbalance
acpid
crash
cryptsetup-luks
dos2unix
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finger
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ksh
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logwatch
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gamin-python
gnome-mount
gnome-vfs2
libbonoboui
libgnome
libgnomeui
oracle-validated
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hicolor-icon-theme
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gnome-keyring
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libglade2
libgnomecanvas
libnotify
libwnck
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audiofile
cups-libs
gnome-mime-data
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• Can you share your experiences in hardening Linux for Oracle and deploying the Oracle 10g RDBMS without installing the scores of packages which themselves might compromise the server?
• What exactly is the dependency for the Oracle 10g RDBMS on X11, Gnome, Gamin and graphic libraries such as Cairo and Pango (to name a few)?
• Which Linux system services are really mandatory for Oracle?
• Does a non-default secure installation compromise Oracle support?
The current memory footprint for this setup (without any workload) is (figures in MB):
total used free shared buffers cached
Mem: 1010 458 552 0 19 377
-/+ buffers/cache: 61 949
Swap: 2047 0 2047
…of this 290 MB belongs to Oracle ☺
I will be working with the other route – without using the oracle-validated rpm.
Please let me have your feedback.
BR
Aniruddha

Hi,
I'll paste the rpm -qa of a RHEL5 server I have installed through rpm -ivh (not yum at all)
aspell-0.60.3-7.1
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aspell-es-0.50-13.2.2
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bitstream-vera-fonts-1.10-7
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elfutils-0.137-3.el5
elfutils-libelf-0.137-3.el5
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elfutils-libelf-devel-static-0.137-3.el5
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gdbm-1.8.0-26.2.1
gettext-0.14.6-4.el5
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gzip-1.3.5-10.el5
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hdparm-6.6-2
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hwdata-0.213.16-1.el5
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iproute-2.6.18-10.el5
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kernel-2.6.18-164.el5
kernel-headers-2.6.18-164.el5
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libaio-0.3.106-3.2
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libgcc-4.1.2-46.el5
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libgcrypt-1.4.4-5.el5
libgomp-4.4.0-6.el5
libgomp-4.4.0-6.el5
libgpg-error-1.4-2
libhugetlbfs-1.3-3.el5
libhugetlbfs-1.3-3.el5
libICE-1.0.1-2.1
libICE-1.0.1-2.1
libjpeg-6b-37
libpng-1.2.10-7.1.el5_3.2
libselinux-1.33.4-5.5.el5
libselinux-1.33.4-5.5.el5
libselinux-python-1.33.4-5.5.el5
libselinux-utils-1.33.4-5.5.el5
libsemanage-1.9.1-4.4.el5
libsepol-1.15.2-2.el5
libsepol-1.15.2-2.el5
libSM-1.0.1-3.1
libSM-1.0.1-3.1
libstdc++-4.1.2-46.el5
libstdc++-4.1.2-46.el5
libstdc++-devel-4.1.2-46.el5
libstdc++-devel-4.1.2-46.el5
libsysfs-2.0.0-6
libtermcap-2.0.8-46.1
libtermcap-2.0.8-46.1
libtiff-3.8.2-7.el5_3.4
libusb-0.1.12-5.1
libuser-0.54.7-2.el5.5
libvolume_id-095-14.21.el5
libvolume_id-095-14.21.el5
libX11-1.0.3-11.el5
libX11-1.0.3-11.el5
libXau-1.0.1-3.1
libXau-1.0.1-3.1
libXau-devel-1.0.1-3.1
libXaw-1.0.2-8.1
libXcursor-1.1.7-1.1
libXdmcp-1.0.1-2.1
libXdmcp-1.0.1-2.1
libXext-1.0.1-2.1
libXext-1.0.1-2.1
libXfixes-4.0.1-2.1
libXft-2.1.10-1.1
libXi-1.0.1-3.1
libXinerama-1.0.1-2.1
libxml2-2.6.26-2.1.2.8
libxml2-python-2.6.26-2.1.2.8
libXmu-1.0.2-5
libXp-1.0.0-8.1.el5
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libXp-devel-1.0.0-8.1.el5
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m4-1.4.5-3.el5.1
mailx-8.1.1-44.2.2
make-3.81-3.el5
MAKEDEV-3.23-1.2
man-1.6d-1.1
man-pages-es-1.28-10.1.1
mcstrans-0.2.11-3.el5
mesa-libGL-6.5.1-7.7.el5
microcode_ctl-1.17-1.48.el5
mingetty-1.07-5.2.2
mkinitrd-5.1.19.6-54
mkinitrd-5.1.19.6-54
mktemp-1.5-23.2.2
module-init-tools-3.3-0.pre3.1.54.el5
nano-1.3.12-1.1
nash-5.1.19.6-54
ncurses-5.5-24.20060715
net-tools-1.60-78.el5
newt-0.52.2-12.el5
nspr-4.7.4-1.el5_3.1
nspr-4.7.4-1.el5_3.1
nss-3.12.3.99.3-1.el5_3.2
nss-3.12.3.99.3-1.el5_3.2
ntp-4.2.2p1-9.el5_3.2
ocfs2-2.6.18-164.el5-1.4.2-1.el5
ocfs2console-1.4.2-1.el5
ocfs2-tools-1.4.2-1.el5
ocfs2-tools-devel-1.4.2-1.el5
openldap-2.3.43-3.el5
openssh-4.3p2-36.el5
openssh-clients-4.3p2-36.el5
openssh-server-4.3p2-36.el5
openssl-0.9.8e-12.el5
oracleasm-2.6.18-164.el5-2.0.5-1.el5
oracleasmlib-2.0.4-1.el5
oracleasm-support-2.1.3-1.el5
pam-0.99.6.2-6.el5
pango-1.14.9-6.el5
paps-0.6.6-18.el5
passwd-0.73-1
patch-2.5.4-29.2.3.el5
pax-3.4-1.2.2
pciutils-2.2.3-7.el5
pcre-6.6-2.el5_1.7
perl-5.8.8-27.el5
pkgconfig-0.21-2.el5
pm-utils-0.99.3-10.el5
policycoreutils-1.33.12-14.6.el5
popt-1.10.2.3-18.el5
prelink-0.4.0-2.el5
procmail-3.22-17.1
procps-3.2.7-11.1.el5
psmisc-22.2-7
pycairo-1.2.0-1.1
pygobject2-2.12.1-5.el5
pygtk2-2.10.1-12.el5
python-2.4.3-27.el5
python-numeric-23.7-2.2.2
readline-5.1-3.el5
readline-5.1-3.el5
redhat-logos-4.9.16-1
redhat-lsb-3.1-12.3.EL
redhat-menus-6.7.8-3.el5
redhat-release-5Server-5.4.0.3
redhat-release-notes-5Server-29
rhpl-0.194.1-1
rootfiles-8.1-1.1.1
rpm-4.4.2.3-18.el5
rpm-libs-4.4.2.3-18.el5
rsh-0.17-38.el5
rsync-2.6.8-3.1
sed-4.1.5-5.fc6
selinux-policy-2.4.6-255.el5
selinux-policy-targeted-2.4.6-255.el5
sendmail-8.13.8-2.el5
setools-3.0-3.el5
setserial-2.17-19.2.2
setup-2.5.58-7.el5
sgpio-1.2.0_10-2.el5
shadow-utils-4.0.17-14.el5
slang-2.0.6-4.el5
smartmontools-5.38-2.el5
sqlite-3.3.6-5
sysfsutils-2.0.0-6
sysklogd-1.4.1-44.el5
sysstat-7.0.2-3.el5
system-config-securitylevel-tui-1.6.29.1-2.1.el5
SysVinit-2.86-15.el5
tar-1.15.1-23.0.1.el5
tcl-8.4.13-4.el5
tcl-8.4.13-4.el5
tcp_wrappers-7.6-40.7.el5
tcp_wrappers-7.6-40.7.el5
telnet-0.17-39.el5
termcap-5.5-1.20060701.1
time-1.7-27.2.2
tmpwatch-2.9.7-1.1.el5.2
tzdata-2009k-1.el5
udev-095-14.21.el5
udftools-1.0.0b3-0.1.el5
unzip-5.52-3.el5
usermode-1.88-3.el5.2
util-linux-2.13-0.52.el5
vim-common-7.0.109-6.el5
vim-minimal-7.0.109-6.el5
vixie-cron-4.1-76.el5
vte-0.14.0-2.el5
which-2.16-7
wireless-tools-28-2.el5
xorg-x11-filesystem-7.1-2.fc6
xorg-x11-utils-7.1-2.fc6
xorg-x11-xauth-1.0.1-2.1
zabbix-agent-1.4.6-1.el5
zip-2.31-2.el5
zlib-1.2.3-3
Hope to help,
Mario Alcaide

How can i start oracle databases? i am using Oracle 8.1.6 for linux.

when i run dbstart,it gives me following message:
Database "ora4cweb" warm started.
but when i use sqlplus,it says:
ORA-01034: ORACLE not available
i made a mistake ,i shutdown my linux before i shutdown oracle databases,how can i start oracle databases now?thanks in advance.

try it without the scripts...
login to linux as oracle
start server manager
svrmgrl
connect internal
startup
select sysdate from dual;if that works
exitcheck listener
lsnrctl
statif nothing running type
start
exitnull

Oracle Database XE Client(winXP) vs Oracle Database XE (linux)

hi everybody there, thanks for having some time for reading me.
i have a linux with Oracle Database XE, under linux with database user 'hr' i can make queries and create applications, that is ok.
also, i've installed Oracle Database XE Client on windows xp machine, and i'am usin this option: Run SQL Command Line, this prompts me to enter user and password, and i am entering this:
connect hr/[email protected]:1521
after a few seconds, i get this error: ORA-12560: TNS:Protocol Adapter Error.
192.168.0.102 is the IP address from my linux database, 1521 is the default port (i am using this port).
is this client looking for file tnsnames.ora? what else do i need on client (or server), to connect to my linux database?
my final aim is to connect from Developer 9i (winxp) to my linux database (in fact, i have the same error of above, trying this), only that i am trying first just to connect from Client XE to my linux, and when i get success with this, i will continue trying with Developer 9i.
if someone can guide me with this, it would be great. i am becoming crazy.
thanks.

hi, thanks friend.
look, as i also installed Developer 9i, i have a directory where i put a tnsnames.ora file, this directory is: d:/OraDev9i/network/admin
i don't know if Client XE, looks for this directory?, if i would not have installed Dev 9i, where can i put this tnsnames.ora file for Client XE to read it?
well, let's asume Client XE looks for directory above, this is my tnsnames entry, pls check it:
XE =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = XE)
EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)
i don't know if there is something wrong with this, please help me.
i did what you told me:
connect hr/francis2010@XE
and i got this:
ORA-12154 TNS: Could not resolve service name
also, i tried changing 'localhost.localdomain' to my linux IP address: 192.168.0.102, and i get the same error message. how do i know where Client XE is reading my tnsnames?
about the listener, i checked with this: sudo /.../init.d/... status, and it seems it is ok, remember i can work well in linux wiht hr, the port is ok, and i also checked with lsnrctl status, and i got LISTEN, so it seems is ok.
sorry, and thank you for your support, maybe this is easy but as i know the basics, i am lost.

High I/O wait observed in Linux based Oracle Database Server

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