Thank you very much.
After I inserting the disk in the DVD-rom nothing is happening. Then I manually rebooted, still no menu display Do I need to enter into the GRUB2 (Using ctrl c, when there are options showing)?

No, Did you burn it as an image? When you reboot the computer a menu should be displayed where you can use the arrow keys to select an option.

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Thank you very much. After rebooting the attached screen appeared. What I need to do? press c and enter in command prompt?

Best Regards
Zillur

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That is the normal grub boot menu from your hard drive not the DVD. Just for grins what happens when you press the enter key?

Thank you. Nothing happens new with DVD. Did I burn it correctly? In the file info it is showing that, its an iso image.
Best Regards
Zillur

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Did you burn the disk as an image? I use OSX so infrequently...
http://hints.macworld.com/article.ph...60619181010389

In the previous post you were booting from the hard drive not the DVD. I assume it wasn't burned correctly but just wanted to see what happened. So I gather nothing.

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Thank you very much. I get your point. But my disk info which was attached previously doesn't suggest that, the disk was burn correctly?

Best Regards
Zillur

Look at the files on the DVD and post what you see.

I assume the computer is set to boot from DVD first.

Thank you. Here is my DVD after burning:

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Looks like you just burned the ISO to the DVD and did not burn as image. Here is what it should look like. How did you install CentOS?

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Thank you very much. It seemed impossible to burn iso image in a dvd in mac. However, when everything failed, the following command burned successfully the iso image.Best Regards
Zillur

Thank you very much for helping me all the way. I am trying to boot in rescue mode. Here is my current file system. It seems I have lost all my previous files. Is there any way to retrieve these files? It seems I have 26TB filesystem(/dev/mapper/centos-home) which is mounted on /mnt/sysimage/home Many users will use this system. So I want to mount home for all the users in 26TB disk on " / ". I also want to mount /mnt/sysimage/boot in a different file system. Can you help me with next step of installation? I just don't want more messes. I gratefully appreciate your help.

Best Regards
Zillur

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Sorry to bother you again. Attached is the my physical volumes. It seems I have a 16TB disk in /dev/sda3, a 111.79GB disk in /dev/sdb1 and another 10TB in /dev/sdc1.
I think all my previous files (including user profiles) are in /dev/sda3, but I now I can't access them. How can I retrieve them? I want to configure the system in a way that very user can use the system easily. Any suggestion on that?

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Some of the files in /boot were moved. Do you remember the command you actually used? If so you can move them back. Search home and /. Not sure how to reinstall the kernel with CentOS 7 under rescue mode yet.

The /mnt/sysimage is just how the rescue mode mounts your file systems. If the system ever boots they will be as usual. Since you are using LVM /boot can not be moved.

LVM is a way to combine disks so they look like one big filesystem. When the systems boots normally all the drives and filesystems appears like one.

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You do NOT want your root filesystem to be shared with "all the users". Keep it separate. Part of the problem is that you will HAVE to impose quotas on the users (otherwise they will use up the storage and then fight you over who gets what - and can prevent you from updating the system).

Keeping it separate helps with backup and restore by limiting what you have to do. It also help protects the system from accidents on the users home directory.

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