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Re: [Xen-API] XCP + RAID
On 23.12.2011 01:28, Scott Zupek wrote:
On 12/22/11 7:33 AM, George Shuklin wrote:
Anyway, I can say one thing: don't do this. Any lowlevel
manipulation with 'fakeraid' and XCP will make you getting a
nasty problems you will need to fix by yourself (without
community help).
If you playing with XCP - turn 'raid' to 'hba' (sata ahci) in
bios and use a single drive.
At this point I am trying to install Debian on a software raid
but I can't get the darn thing to bootup. Raid has been turned
off and all 4 SATA3 drives are set to ACHI mode. Grub is a
nightmare and apparently "mdm raid" software is the way to go. I
have been trying to get this to work for a few days now.
If you wish to use XCP, no debian, sorry. XCP is shipped with very
tight tuned OS inside and shall works with it only. If you are
talking about xcp packages for ubuntu/debian - they are not ready
for product environment.
If
you wants to use this in product - think about proper hardware.
nForce is NOT A SERVER solution.
I completely understand the nForce is NOT a server solution, but
in all reality, this is 1 server hosting 3 or maybe 4 servers
for my I.T. consulting company. I don't need top of the line
performance so I don't need the 1000+ USD raid cards. nForce has
yet to fail me and I am not runnign a data center, so those
speed differences are negotiable. nForce is still a hardware
solution, but moreso geared towards high end
users/workstations. Regardless I gave up on the hardware raid
as that system board didn't support AM3+. I understand that I
am between a home user and a business class/enterprise user.
That's why I am trying to get Xen Hypervisor and XCP to work
correctly. :)
nForce raid is not an 'hardware solution'. Spit to the eyes to guy
who told you this. 'fake raid' is just changed PID/VID of device, to
make it not working with default AHCI driver. A specially crafted
windows driver recognize those PID/VID and do software raid,
presenting to operating system a 'raid' device. But actually all
work happens inside driver. So there is NO difference in performance
of 'fake raid' and software raid (I do actually think that software
raid will be faster).
But XCP does not support software raids. So you need to wipe
completely content of drives and install XCP to clean system to the
first disk (sda).
If you do really wants to use local disks as storage, and have
redundancy you can create two SR later create two same size VDI and
join them together as raid1 in guest machine. (but this is kinda...
weird).
PS
XCP supports up to 32 cores, so 8 core shall works fine.
That is actually great to know. Thank you. It sounds like I'll
have to get XCP to work with Xen Hypervisor running on top
Debian (with DOM0 kernel). Since it's not as easy as the XCP
ISO/Hypervisor, hopefully I can get it to a manageable state
using XenCenter. speaking of, is there a "better"/more unified
management tool beyond XenCenter? I don't want management to be
complicated, I am just curious.
Thank you for the help/responses. This is all new
techology(software wise) to me and I love learning as I go. I
apologize if I am filling the mailing list with off topic
material. Since it all goes back to XCP-API I thought it might
pertain.
Main management system for XCP is 'xe' command line. You need to
have medium level of understanding XenAPI relations model to use it
(see documentation for XenServer).
And please, don't mix xen+xend (xen- packages in may distro) and
XCP. XCP use xen, but differ significantly from xapi (the core of
XCP toolstack).
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