Re: [Xen-users] iscsi vs nfs for xen VMs

[Christian Zoffoli <czoffoli@xxxxxxxxxxx>]

Hi,

if you want to push on performance the best one is:

CLVM over iSCSI

if you need fully redundancy you have to double everything:
- switches
- network ports
- PSUs

and

- storages.

If you want to a completely redundant storage solution you can use DRBD
in active-active

Just some notes:
- VMs over files over NFS is slow (only some vendors have a relative
fast NFS appliance).
- VMs over files over a cluster FS is slow

everytime you add a layer (in particular a clustered FS layer) your
performances drop down ... so make it simple


Best regards,
Christian

P.S. another interesting approach would be NFS over RDMA (infiniband)
...most of the advantages of NFS with less disadvantages compared to NFS
over TCP/IP

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