Dual boot Windows Server 2008 R2 and RHEL 7 Server?

Do someone know how can I setup dual boot of Windows Server 2008 R2 and RHEL 7 Server?
I've tried to install Windows first, then shrink, then install RHEL there.
But GRUB2 loader doesn't offer to start Windows, only Linux in the menu. (probably Windows partition need to be added to grub2 somehow)

Hi Oleg Vazhnev,
Please refer to following article and check if can help you.
How
to add Vista/Windows 7 partition to Grub 2 (Ubuntu 9.10, Karmic Koala)
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft
does not guarantee the accuracy of this information.
Meanwhile, please also refer to following video and check if can provide you more details of installation.
Install RHEL 7 in Legacy Mode (Dual Boot Windows Server
2008 R2)
Please Note: Since the web site is not hosted by Microsoft, the link may change without notice. Microsoft
does not guarantee the accuracy of this information.
If any update, please feel free to let me know.
Hope this helps.
Best regards,
Justin Gu

Similar Messages

Convert PXIe-8135 controller to dual-boot Windows 7 and LabVIEW RT

Hello. I have a PXIe-8135 controller that originally was just running Windows 7. We are trying to convert it to a dual boot system to also run LabView Real Time. (There is host computer that will run LabVIEW 2014 with the RT module, and the controller will become a target).
I have created a FAT32 partition on the hard drive of the controller. Now, I’m trying to install the real-time OS with a USB flash drive made using the MAX utility, but I cannot boot using the USB drive for some reason. I keep getting the message “waiting for USB device to initialize”.
In BIOS, legacy USB support is [ENABLED] and boot configuration is set to [Windows/other OS]. I’ve tried removing the drive, waiting, and reinserting. I’ve tried two different USB drives (both 8 GB, different brands).
I’m not sure what to do next. Apart from the USB boot issue, is converting the PXIe-8135 even possible? I read about SATA/PATA hard drive issues with older controllers, but I don't know about this one.
Thanks, in advance, for your help!
-Jeff
Solved!
Go to Solution.

Per Siana's licensing comment, more information on purchasing a deployment license if you do not have one for this target can be found here.
The RT Utility USB key is used to set up non-NI hardware with LabVIEW Real-Time, but you should not need it in this situation to convert to dual-boot (*). Try this:
1. Since you already have a FAT32 partion created, go into BIOS setup and change to booting 'LabVIEW RT'.
2. The system will attempt to boot LabVIEW RT, see that the partition is empty, and switch over into LabVIEW RT Safe Mode. (this safemode is built into the firmware, which is why you don't really need the USB key).
3. The system should come up correctly and be detectable from MAX, and you can proceed with installing software.
4. To switch back to Windows, go back to BIOS setup and choose 'Windows/Other OS'
(*) One area where the USB key is helpful on a dual boot system is with formatting the disk. If you want to convert from FAT32 to Reliance on the partition designated for LabVIEW RT, the USB key lets you attempt to format a single parition and leave the rest of the disk untouched. If you format from MAX, the standard behavior is to format only one RT partition if found, but if not found, it will format the entire disk. Formatting from MAX on a dual boot system is consequently riskier and you could lose your Windows partition.

Windows Server 2008 R2 and Windows 7 DNS Problem

Hi,
I have a DNS Server hosted in Windows Server 2008 R2 and our clients are using Windows 7. All are working fine then suddenly there are times that our client cannot access our internal site and cannot connect with our IM which is also hosted in the server.
Tried to ping the server's IP but got this result:
Ping request could not find host .com. Please check the name and
try again.
NSLookup works fine. Tried to use the ip address instead of the domain name and it works. Resetting network connection seems to resolve the issue but we cannot do it all the time especially when we have hundreds of computers in our office. Anyone have ideas
regarding this?

Hi,
“Resetting network connection seems to resolve the issue but we cannot do it all the time especially when we have hundreds of computers in our office. Anyone have ideas regarding
this?”
It seems is the client IP address conflict, it may cause by your DHCP Conflict Detection Attempts value setup is not appropriate. You can try to set Conflict Detection Attempts
to a value other than 0.
More information:
Detect and Avoid IP Address Conflicts
http://technet.microsoft.com/en-us/magazine/ff606371.aspx
Hope this helps
We
are trying to better understand customer views on social support experience, so your participation in this
interview project would be greatly appreciated if you have time.
Thanks for helping make community forums a great place.

Y500 dual boot windows 8 and fedora 19 problem

I bought a y500 two days ago and i wanted to dual boot windows 8 and fedora 19, so here's what i did
1. downloaded fedora 19 (x64) iso from the fedora website.
2.made a live USB using live usb creator.
4.opened disk management utility and shrunk the c drive (windows 8 was installed here) by 100 gb and kept the 100gb unallocated.
3. started the laptop with novo button, changed the bios config to boot from usb.
4.installed fedora from usb, selecting the 100gb unallocated memory for installation
5.restarted the laptop.
now the problem is fedora works perfectly but when i try to boot windows 8, the following error is shown.
windows failed to start
file:\BOOT\BCD
status: 0xc0000225
info:the boot configuration data for your PC is missing or contains errors.
i am guessing the fedora installation overwrote the boot files of windows and
i have not taken a backup. please help

hi,
I have a Y500 and I wanted to dualboot fedora 19 with windows 8, this proved to be unsuccessful. I had made a repair disk before the process (but not a set of recovery disks unfortunately >.< ). now I inserted the repair disk and selected the automatic repair option, it showed a message that auto recovery has failed. now when I pressed the NOVO button and selected the system recovery option, it does not go into the OKR menu but continues with the normal booting process. Can somebody guide me or give links where I can find step by step instructions to making OKR work and reset my laptop to factory settings? PLEASE help As Soon As Possible
NOTE: I did resize the windows 8 os partition but the recovery and the lenovo partition are still untouched

Dual Boot Windows 8 and Linux?

I have (UEFI System) an ASUS K55A UEFI motherboard laptop that came factory with Windows 8. I would like to install backtrack linux and Windows 8, but before I go screwing up my laptop, I want to see if this would be at all possible. I would use a virtual
machine, but I need Backtrack Linux on a physical machine for testing purposes as I am taking a course in computer forensics, and I want to test cracking my home wi-fi. My processor is an Intel Core i5 2.5 ghz with a 500 GB HDD and 8GB DDR3 RAM. Any insight
on this would be appreciated. Thank You.

Hi,
You can refer to this article to get detail information.
http://apcmag.com/how-to-dual-boot-windows-8-and-linux.htm
Niki Han
TechNet Community Support

[SOLVED] Dual boot windows 7 and arch Linux with seperate hard drives

Ok so I'm stuck trying to get my computer to dual boot windows 7 and arch. They are installed on different hard drives and I have grub 2 as the boot loader. I can't find any tutorials on how to do it with seperate hard drives I know how to do it if they are on the same hard drive. Also I want windows on the "first" hard drive how do I check to see which one it considers the first?
Last edited by bdawg (2012-09-21 23:15:37)

DSpider wrote:
drobole wrote:If you want to change it so that sda becomes sdb and sdb becomes sda, you should be able to do that in BIOS.
Not from the BIOS. He would need to physically open up the computer and switch the cables between them (or add another drive).
There's no actual performance increase in changing this order. Performance increase is when you have the partitions as close to the beginning of a HDD as possible, where the platters spin faster (basic mechanics, not to be confused with CD/DVD, which are being written from the inside-out to prevent errors after extended usage), and it especially doesn't apply to SSDs whatsoever.
You may be right about that. I remember I had to do this a while back but I probably switched the cables. It also messed up the drive mapping in Windows 98 if I remember correctly.

Dual booting Windows 8 and Arch Linux with UEFI

Hi all!
I'm trying to install Arch Linux on my computer where I already have Windows 8, and I'm getting a little stuck when it comes to the partitioning.
Following the beginner's guide and the method here: https://wiki.archlinux.org/index.php/Un … n_in_Linux for setting up the partitions properly, regarding UEFI. My problem is that when using cgdisk to set up a new EFI system partition (ef00), I get an error message when trying to write the partition table (just saying that something went wrong). I figure the problem is that I already have a partition like this (correct me if I'm wrong), but it really looks like it succeded (see info below). So my question is: How do I preceed to keep my Windows 8 installation happy, but installing Arch? Do I remove the old EFI system partition and create a new one, or is there some method that allows me to edit the already existing one, to allow me to dual boot Windows 8 and Arch?
My partition table now looks like this:
Part. # Size Partition Type Partition Name
1007KB free space
1 500MB Windows RE Basic data partition
2 300MB EFI System EFI system partition (this one was already present on my system)
3 128MB Microsoft reserved Microsoft reserved partition
4 63.5GB Microsoft basic data Basic data partition
8 512MB EFI System EFI System partition (this is the one I tried to create when I got the error message)
5 29.5GB Linux filesystem Arch (this is where I was going to put my Arch installation)
6 22GB Windows RE Basic data partition
7 1024MB Windows RE Basic data partition
615KB free space
Just for the record; I only created partition #8 and #5.
Any help is appreciated! And sorry for beeing a total noob, but I really suck at this.

sudo make sandwich wrote:If it is possible to share ESP between OSes, how do I do this (would it be sufficent to follow this section: https://wiki.archlinux.org/index.php/Beginners'_Guide#For_UEFI_motherboards)?
There's really very little to do to share an ESP between OSes. Most OS installers will auto-detect the ESP and use it. Problem solved. For Arch it may be a bit more effort just because Arch uses a more hands-on installation process, but I've only done a couple of Arch installations, and the last one was several months ago, so I don't recall the details clearly enough to comment.
And how big will the partition need to be? The beginner's guide says 512MB or higher.
I don't know what was in the mind of the author, but my guess is that's because that's roughly the cutoff point where mkdosfs starts creating FAT32 by default rather than FAT16. The ESP is officially supposed to be FAT32, not FAT16, although FAT16 usually works OK. It's also possible to create FAT32 on smaller partitions by using an explicit option to mkdosfs ("-F 32").
The optimal size of the ESP depends on the files stored on it. If you don't store your Linux kernels, something as small as 100MiB is usually adequate; but a few Linux kernels and their initrd files can consume twice that amount. My own recommendation is for the ESP to be 200-500MiB.
The only error message I got from cgdisk is "Problem saving data! Your partition table may be damaged!", however booting Windows again works fine. Parted did not complain about antything.
Use the "verify" function in cgdisk. That will reveal any problems with the data structures. If a verify turns up OK, then that means that cgdisk ran into some sort of disk problem. Running gdisk rather than cgdisk and using the gdisk "w" option (without making any changes) may produce a more helpful error message.

Dual boot Windows 7 and Arch from 2 seperate drives (UEFI)

Hello everyone, I've been working on installing Arch to a secondary hard drive for the past few hours, but I am trying to make sure I won't mess up my Windows 7 install. I have found several topics talking about dual booting Windows 7 and Arch, but not a whole lot on booting them from separate drives. My drives are currently setup as follows.
sda (120GB SSD for Windows 7)
sda1 (100MB System Reserved NTFS partition)
sda2 (Windows 7 install)
sdb (1TB HDD for Windows programs, files, etc)
sdb1 (1TB NTFS partition)
sdc (1TB HDD)
sdc1 (boot 512MB FAT32)
sdc2 (root 500MB ext4)
sdc3 (home 300GB ext4)
sdc4 (swap 10GB)
rest unallocated "free space"
I used Gparted to create the partitions. I ended up getting hung up on the "Create Filesystems" sections, specifically this line"
# mkfs.fat -F32 /dev/sdXY
Now that I am looking at it, I'm thinking the "Create Filesystems" section maybe isn't necessary because I've used Gparted?
If it isn't necessary, when I get to the "mount the EFI System Partition to /boot" section, would I simply use
# mount /dev/sdc1 /mnt/boot
instead of
# mount /dev/sdXY /mnt/boot ?
The way I had this setup with Ubuntu was 3 partitions on sdc (/, home, swap) and I set my PC to boot to the sdc drive on startup. The boot loader would then give me the option to boot into Ubuntu or Windows 7, and I never had to alter the sda or sdb drives at all. Is this possible through Arch? My thinking is that even if it isn't, I should still be able to enter the BIOS boot menu and select which drive to boot manually correct? That wouldn't be too big of a deal for me because I spend 90% of my time in Linux, and only use Windows for Photoshop and gaming occasionally.
Thanks for taking the time to read this. I would have just tested this out, but I am afraid of messing up my Windows install.

After several sleepless hours I had to give up and go to bed about 5 hours ago. The installation process went smoothly (or so I thought). I followed the tutorial closely and upon rebooting I was met with a blinking cursor. After some googling I found others who said I should press TAB, but nothing seemed to work.
I rebooted to the iso disk and found the "boot installed OS" option and noticed it said "Press TAB to edit". I then found the boot parameters and tried everything from hd0 0 to hd4 4. I believe I have Grub setup correctly because every option besides hd0 0 either says "Booting..." and then gets stuck, or says "That disk and partition combination does not exist". So yea, I think hd0 0 is the correct boot path, it just gets stuck with the blinking cursor.
silverhammermba wrote:
You have the right idea. You want to install a bootloader on sdc1 which will be able to boot both Arch and Windows.
Your best bet would be to use something like rEFInd. It has a "scanfor" option that should automatically detect your BIOS-configured Windows installation and add a boot option for it. Note that depending on your motherboard, you may have to switch to UEFI-only mode and Windows will be unbootable without the assistance of a UEFI program which is backwards compatible with BIOS (like rEFInd).
Thank you for the link. Considering I can't get into my install and the actual install only took about 30 minutes, I think I am going to just start from the beginning again with REFIndr. It seems much simpler. I only used Grub because I've used it before with Ubuntu, but my very limited knowledge is telling me Grub is probably the problem.
MoonSwan wrote:Just an idea: My bios has a "Boot-up Prompt" which I can invoke when it's POSTing by hitting F11. This brings me to a menu that allows me to choose which drive I want to boot up that day. I use it when Syslinux isn't working properly (Which is right now as a matter of fact ...) in order to boot Windows so I can do some SCII, for example. I, too, dual-boot but I have both OSes on different SSDs. So my 120GB Crucial SSD has Arch on it and the 240GB Kingston has Windows, SCII, Portable Apps, etc and nary the two shall meet. It makes dual-booting easier in the case of a corrupt OS or MBR or what-have-you. You may want to give your Bios a better look to see if you can do the F11 trick. It probably can and will usually tell you so at POST by printing that information on-screen along with your drives-detected and other messages (I hit Pause sometimes to read all the POST messages).
This is exactly what I was talking about doing when I mentioned:
My thinking is that even if it isn't, I should still be able to enter the BIOS boot menu and select which drive to boot manually correct?
That's good to know, because even if this next install doesn't work I think if I pull the other drives I should be able to get it working fairly easily.
Thanks again everyone.

Dual Boot Windows 7 and Arch with Shared NTFS partition.

Hi everyone,
I want to dual boot windows 7 and Arch Linux.
Here's the problem... my hard drive isn't the biggest. I want to store all my music, movies, pictures, and documents on partition that both linux and windows can access seamlessly.
I want the partition to be NTFS. -- (the programs that map an ext4 drive to Windows are trash).
Here's what I think I need.
30GB NTFS to Windows.
30GB ext4 to Arch Linux
The remainder (190ish GB) to Shared Data.
I don't want the swap partition because I have a SSD and 4GB of RAM.
What is the best way to setup my partitions? And is this even possible?
Thanks!

Not a problem. I would create:
First of four primary partitions for windows.
Second of four primary partitions for /boot
Third of four partitions is an extended partition encompassing all the space not used by the first two partitions.
Put everything else inside the extended partition.
Mine is a bit more complicated, but this should give you an idea:
ewaller@odin:~ 1005 %sudo fdisk -l /dev/sda
Password:
Disk /dev/sda: 320.1 GB, 320072933376 bytes
255 heads, 63 sectors/track, 38913 cylinders, total 625142448 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x87b33479
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 121778159 60888056 7 HPFS/NTFS/exFAT
/dev/sda2 597366784 625135615 13884416 83 Linux
/dev/sda3 121778160 597366783 237794312 5 Extended
/dev/sda5 * 121778223 123770219 995998+ 83 Linux
/dev/sda6 123770283 131770589 4000153+ 82 Linux swap / Solaris
/dev/sda7 193213818 597360959 202073571 83 Linux
/dev/sda8 131781258 193213754 30716248+ 83 Linux
/dev/sda9 131770591 131781194 5302 1 FAT12
Partition table entries are not in disk order
ewaller@odin:~ 1006 %
Partitions 1 and 2 are Primary partitions. Partition 3 is an extended partition. All the others live in partition 3

Dual boot windows 7 and solaris 11

Hi Friends,
Could some one please explain the steps to install dual boot windows 7 and solaris 11?
Thanks
Raja

Install Windows leaving a partition for Solaris. Install Solaris into the empty partition. Reboot. Use a partition manager if you need to shrink your current Windows Partition. GParted works great and is free.
alan

Dual Boot Windows 7 and solaris 10

Can some body guide me how to dual boot windows 7 and solaris 10?
Thanks

First partition your harddisk with at least 2 primary partitions, one for windows and the other for solaris if you only have one harddisk. It would be a good idea to create an additional small boot partition as the first partition as well if you intend on using an independent boot loader but it really depends on what your machine is capable of. For example, if you have multiple harddisk and your BIOS supports it, then you could just install each OS onto its own harddisk and use the BIOS function to disable/boot off specific harddisk. Otherwise, if you only have one harddisk and created multiple partitions, install windows7 first followed by solaris10, obviously installing into different partitions. If you have created a boot partition, then you can install the boot loader into that dedicated partition.

Dual Booting Windows and Solaris

Hi
how do i dual boot windows and solaris
Do i install windows first and then solaris or do it the other way around..?
how do i make sure that Windows and Solaris appear in my boot options..?
Is their a guide on doing this...?
Thanks
Liam

Hey I did a quick google search for you. So I havent tried this method myself but it sounds reasonable.
The text below is from the following link:
http://www.hccfl.edu/pollock/AUnix1/DualBoot.htm
"Solaris boot loader
Partition the drive to leave at least 2GB of space available for Solaris;
more drive space is desirable.
As with Linux, install Windows first then Solaris.
Do not use the Installation CD but boot and install
from Software CD 1.
If you accept the default partitioning scheme which
the installer provides you will soon run out of space in
your / and /usr partitions since only enough space is
allocated to install the system.
All extra space is allocated to /export/home.
A typical installation on a 4.5GB partition might look
something like this:
Filesystem Size Used Avail Use% Mounted on
/dev/dsk/c0d0s0 900M 536M 310M 64% /
/dev/dsk/c0d0s1 334M 109M 192M 36% /var
swap 671M 8.0k 671M 1% /var/run
swap 671M 8.0k 671M 1% /tmp
/dev/dsk/c0d0s5 845M 222M 565M 29% /opt
# (FAT32 partition):
/dev/dsk/c0d0p0:1 5.0G 3.3G 1.6G 66% /c
/dev/dsk/c0d0s7 1.1G 92M 954M 9% /export/home
/dev/dsk/c0d0s4 752M 225M 474M 33% /usr/local
The Solaris boot selector enables you to choose either
Solaris or Windows with Solaris as the default.
(I prefer grub or lilo!)
To mount FAT under Solaris:
# mount -F pcfs /dev/dsk/c0d0p0:c /dos (or �:1�?)
And the vfstab file:
/dev/dsk/c0d0p0:c - /dos pcfs - yes -
To create a GRUB boot floppy, follow these steps:
$ mkfs -t ext2 /dev/fd0
$ mount /dev/fd0 /mnt/fd0
$ mkdir /mnt/fd0/boot /mnt/fd0/boot/grub
$ cp /boot/grub/stage[12] /boot/grub/grub.conf \
> /mnt/fd0/boot/grub
$ /sbin/grub --batch <
Hope this helps!
/Oscar

Can I dual boot with MAC OS/X and Windows

What is the best way to configure a dual boot on my MAC Bookpro laptop? Also, can I dual boot Windows 8 and MAC OS?

The first alternative is a dual-boot arrangement between OS X and Windows provided with OS X.
Windows on Intel Macs
There are presently several alternatives for running Windows on Intel Macs.
   1. Install the Apple Boot Camp software. Purchase Windows
         XP w/Service Pak2, Vista, or Windows 7. For Boot Camp
         4.0 and above you can only use Windows 7 or later. Follow
         instructions in the Boot Camp documentation on
         installation of Boot Camp, creating Driver CD, and
         installing Windows. Boot Camp enables you to boot the
         computer into OS X or Windows.
     2. Parallels Desktop for Mac and Windows XP, Vista Business,
         Vista Ultimate, or Windows 7. Parallels is software
         virtualization that enables running Windows concurrently
         with OS X.
     3. VM Fusion and Windows XP, Vista Business, Vista Ultimate,
         or Windows 7. VM Fusion is software virtualization that
         enables running Windows concurrently with OS X.
     4. CrossOver which enables running many Windows
         applications without having to install Windows. The
         Windows applications can run concurrently with OS X.
     5. VirtualBox is an Open Source freeware virtual machine such
         as VM Fusion and Parallels that was developed by Solaris.
         It is not as fully developed for the Mac as Parallels and VM
         Fusion.
Note that VirtualBox, Parallels, and VM Fusion can also run other operating systems such as Linux, Unix, OS/2, Solaris, etc. There are performance differences between dual-boot systems and virtualization. The latter tend to be a little slower (not much) and do not provide the video performance of the dual-boot system. See MacTech Labs- Virtualization Benchmarks, January 2013 | MacTech for comparisons of Boot Camp, Parallels, and VM Fusion. Boot Camp is only available with Leopard or Snow Leopard. Except for Crossover and a couple of similar alternatives like DarWine you must have a valid installer disc for Windows.
You must also have an internal optical drive for installing Windows. Windows cannot be installed from an external optical drive.

Access Denied DNS Server 'Windows Server 2008 R2 and Install AD (PDC) and ADD (BDC=Additional AD)

hi
I Have
Windows server 2008 R2 and Install Active Directory
Install and configuration for windows server 2008 PDC (Primary Domain Controller) and BDC (Additionall Domain Controller)
Error
A security Package specific Error Occurrred. would you like to add it anyway
and
Access Denied Console Other Domain AD
and Nslookup
C:\Users\admin>nslookup pdc
Server: bdc.*.*
Address: 10.0.X.X
Name: pdc.*.*
Addresses: 10.0.1.11
10.0.X.X

Hello,
your description is a bit confusing. You get the error message when you try to add the other DC to the DNS management console on one machine?
Both DCs belong to the same domain according to your description?
Please post an unedited ipconfig /all from both DC/DNS servers here.
BTW: PDC/BDC concept is gone since the start from AD with Windows 2000 Server. All DCs are the same, difference are only the FSMO roles, still that can be held from any DC in the domain according to some rules.
Best regards
Meinolf Weber
MVP, MCP, MCTS
Microsoft MVP - Directory Services
My Blog: http://msmvps.com/blogs/mweber/
Disclaimer: This posting is provided AS IS with no warranties or guarantees and confers no rights.

Do we need CALS for windows server 2008 R2 and 2012 R2 if 2008 R2 is just a stepping stone?

We currently have a server on Windows Server 2008 RC SP2 64-bit with approximately 20 clients.
We want to upgrade to Windows server 2012 R2 but first need to upgrade to Windows 2008 R2 to allow us to do a straight upgrade.
Is it possible to upgrade to Windows Server 2008 R2 with the 5 CAL's included and then upgradeto 2012 R2 and install 20 new CAL's and keep all users accounts and domain PC's the same?

Ok sorry for using the wrong terminology... I was under the impression for each client (Computer) connecting to the server we will need a CAL (Client Activation License) in order for the computer to be a domain PC on the server. Do I need 20 CALS's
for Windows Server 2008 R2 and then another for Windows Server 2012 R2 if we are only upgrading to 2008 R2 to be able to upgrade to 2012 R2 without having to do a clean install.
For WindowsServer (Standard edition or Enterprise edition or DataCenter edition), a Client Access License (CAL) is required for each device (if you're using the per-Device CAL licensing method), or, is required for each user (if you're using the per-User
CAL licensing method).
(whether you use per-Device, or per-User, is up to you, it comes down to cost).
CALs are version-specific (to a point) - i.e. if you purchased WS2008 CALs for your 20 devices, for use with your WS2008 server, and you are now upgrading that server to WS2012, you need to upgrade your CALs.
If you are adding a second server which is WS2012, and you are keeping your WS2008 server, you need to upgrade your CALs (because you only purchased WS2008 CALs which don't grant you the rights to connect to the newer server).
If you were to install your second server as WS2008, you wouldn't need to purchase additional CALs, because as long as the version is the same, a single CAL grant you access to unlimited server (of the same version).
CALs can be tricky to correctly license.
Here's some introductory reading:
http://www.microsoft.com/licensing/about-licensing/client-access-license.aspx#tab=1
And, none of this relates to the technical aspects of product installation/configuration at all (e.g. clean install vs. upgrade).
Windows Server CALs are not license keys/tokens/files which you install/load/download - Windows Server CALs are quite literally paper-based (just like a drivers license or car registration). You are required to have them, to be correctly licensed, but, you
don't physically do anything with them to own/drive a car.
Don
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This helps the community, keeps the forums tidy, and recognises useful contributions. Thanks!)

Dual boot Windows Server 2008 R2 and RHEL 7 Server?

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