oops, I was just advised of the limits when adding multiple logical
volumes to a VM...
"you can have upto 3 for fullvirt (or 4 if you PXE it instead of CDRM),
or 16 for paravirt" - thanks Dan B.
Mark
Mark Nielsen wrote:
Augusto Castelan Carlson wrote:
Hi!
Are you trying to use 2 logical volumes to separate / and /boot inside
the VM, or present 2 logical volumes (which would show up as 2 separate
disks entirely, xvda and xvdb for instance) to the guest from domain-0?
I'm trying to present 2 logical volumes to the VM.
If you are trying to present 2 logvols to the VM itself, those will
show
up as 2 separate disks inside the VM, as I mentioned (xvda, xvdb, or in
HVM sda, sdb, .. you get the idea) and I would wonder why you would
want
to do that.
How can I present 2 logvols to the VM?
I proposed to my "boss" to present one logvols to the VM and then do
the partitioning inside the VM (xvda1 = /home, xvda2 = /groups,...),
but he wants to present 2 logvols, one to be used for /home and the
other for /groups...
OK, well I'm not sure what benefit this would provide you honestly. I
am assuming that both logvols you present to the VM are coming from
the same storage (be it SAN or local disk). You are lucky (if you
insist on using virt-manager), however, in that it's /groups you want
to partition off. You could simply install the system as normal with
/, /boot, /home, et al, residing on xvda. Then you shut the VM down,
edit the config file for the VM to add the second logical volume as
xvdb, start the VM back up and fdisk/partition/format and create your
logical volumes as you would normally. Think of it as installing a new
box, then shutting it down to physically add a new hard disk. It makes
things a little easier it you think of VMs as being just like any
other server, the same thing you'd do to a physical box you have to
pretty much do with a VM (there are exceptions, block attach, etc) but
the hardware is just "virtual" vs. physical.
OR -- simpy use virt-install. It's a cmd line based too, but I find
faster and simpler to use. The -f flag is used to present a disk, you
just add -f as many times for as many logical volumes you want to
present. I would expect that it orders them just as you do on the
command line.
Do you believe that is better to present only one logvols? If so,
please tell me, maybe a can convince him about use only one.
I add 2 logical volumes all the time to just about every VM I have,
but I typically do it because the LV in question is shared among VMs
with GFS partitions inside the VM in a cluster of virtual systems :)
again, just add -f as many times as you want using virt-install.
Thanks!
Regards,
Augusto
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