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Centos installation

I have tested the installation of Centos Linux and already installed a HDD with default centos setting. This is the default OS disk

When I use "fdisk" to change the partition, it tells that "Partition 1 does not end on cylinder boundary". Actually, should I need to align the disk first before installing the Centos. How should I do this ? When I boot up the Centos installation disk, it doesn't have the option to install Centos...


I try to install another HDD for data disk. Using fdisk, it ask to create a partition number. What partition number should I use ? Should I use number 1 or 2 ? Does that make any difference ?

Thanks
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AXISHK
Asked:
AXISHK
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1 Solution
 
arnoldCommented:
You have several options.
You can use raw partitions, 1-4 primary, and then you can use extended/logical partitions.
The alternative is to use LVM.

Aligning the partition "improves performance"
You do not need to align.
You can use Druid during the install to partition the two hard drives.
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AXISHKAuthor Commented:
Can u drop me the steps (commands), especially on how to add another HDD to the Centos Linux and make it as another logical volme used for data ?

Tks
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arnoldCommented:
post your fdisk -l
df -k

you can use pvcreate /dev/sdb for example
vgcreate newvolumegroup /dev/sdb
vgextend oldvolumegroup /dev/sdb

lvcreate -L xG -n logicalvolume volumegroup
http://www.centos.org/docs/5/html/5.2/Cluster_Logical_Volume_Manager/
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AXISHKAuthor Commented:
Successfully installed another HDD. However, I still have no idea how to align the disk for better performance. Any further advise ?

Tks
fdisk.bmp
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arnoldCommented:
Better performance, compared to what.

Alignment is often recommended for high I/O servers I.e. database servers.
Please post the text output rather than images of
df -k
fdisk -l
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AXISHKAuthor Commented:
Sorry, can't copy the output into text as the mouse lost control when I click on the VM guest screen.

The data partition will host mysql database..
df.bmp
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arnoldCommented:
Your sda1 ends on 64 which is why it complains.
It is not an issue to worry about,
In the future, you would want to have the partition to end at an 8 multiple minus 1.
63, 71, etc.
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AXISHKAuthor Commented:
Thanks. again, how can I make it algin when I issue fdisk and format at the very beginning.

Tks
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arnoldCommented:
End on 63 or x*64-1 for cylinder count.
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AXISHKAuthor Commented:
Sorry, I can't get your idea. What should I type when I fdisk the volume / device ?

Tks
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arnoldCommented:
How much space do you want for each partition?
At times, when one specified xMB or xGB the tool would adjust to the closer based on the cylinder boundary.
Other than the annoyance of having it displayed when fdisk -l is run.
More recent consensus that it is not as important these days.
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arnoldCommented:
When formatting start the first partition at cylinder 63 and you should not get these not at cylinder boundry.
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