how to install oracle linux 5 with paravirtual scsi controler over vmware exsi
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this article is the preparation for the oracle exadata installation, as we know that it's so fast to install and do some work under os ORACLE linux 6 which default scsi controler is paravirtual scsi. also the vmware document also confirmed that paravirtual scsi provide faster speed and low cpu usage.
the parallel scsi is not in the kernel of oracle linux 5 , so it's impossible to direct use the lastest vmware scsi controler - paravirtual scsi. what are going to do is install the os with old module then replace it with the module with paravirutal scsi driver.
1. install the os with default setting , the scsi controler should be lsi logic parallel.
2.install vm-tools
3.shutdown the os and modify the vm machine by adding a new disk with paravirtual scsi controler (the paravirtual scsi only can't be the driver for the boot partition)
4.start the os testing the newly added drive can be mkfs.ext4 and mount(prove that the paravitual scsi works well.)
4.vi /etc/modprobe.conf by adding line at the bottom of the file : alias scsi_hostadapter4 pvscsi
5.uname -r (for me it return 2.6.18-274.el5) and backup the corresponding image file
mv /boot/initrd-2.6.18-274.el5.img /boot/initrd-2.6.18-274.el5.img.bak
then generate the new image file :
mkinitrd -v -f /boot/2.6.18-274.el5.img 2.6.18-274.el5
6.shutdown the os and replace the first scsi type with paravirtual scsi and start os ,aha ,now you are using paravirtual scsi .
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