Xen users - May 2007 - best practicefor storage allocation for vm?

dear list,

whats de best practice giving store to vm?
you can make plans for every server, but some have much free space, some
vm''s need storage. is there a way to easy change disk capacity?

storage for xen-server side:
a) fc shared storage for a hand of servers. images sored on centrally storage.
b) local lvm and the posibility do add local disks for the vm''s
wich variant do you prefer?

on vm side:
my idea was to give every machine minimum disk and add disks when needed.
but what do do when unexpected growth or changes needed?

a) resize lvm-disk => have to user reiser or ex2-fs which can do resizing?
b) add an extra disk and use lvm on vm too? => also problem with resizing
filesystem?
c) mounting the disk (maybe my snapshot), takeing the files and copy to a new
bigger disk.

a and b looks interessting, but i think c would also be very easy way?

any other ideas?

regards
josy

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On May 29, 2007, at 12:59 AM, it-news ((Josef Lahmer)) wrote:
> whats de best practice giving store to vm?
> you can make plans for every server, but some have much free space,  
> some vm''s need storage. is there a way to easy change disk
capacity?
>
> storage for xen-server side:
> a) fc shared storage for a hand of servers. images sored on  
> centrally storage.
Doesn''t need to be FC. AoE and iSCSI are suitable as well.

Also, you don''t need images, if you mean loopback devices. You can  
actually use direct block devices with this setup, which provides  
better performance.
> b) local lvm and the posibility do add local disks for the vm''s
> wich variant do you prefer?
This doesn''t allow for VM migration, so it''s somewhat
distasteful.

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