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xen-users
Re: RES: [Xen-users] Shared volume: Software-ISCSI or GFS or OCFS2?
Bruno Bertechini wrote:
Can someone explain why we should use NFS? It is fairly slow and unsecure.
It depends. If you're using a NetApp server or an EMC Celerra then NFS
isn't slow and it's secure "enough". The big advantage of NFS is that
it is easy to get working and it's well understood by a lot of people.
Why not use some clustered FS ?
NFS is a clustered file system -- it's a file system that's visible
across a cluster. If you mean an HA cluster, then yes, you can use
something like ocfs2 or gfs/gfs2. These things, however, are designed
when you want concurrent access to individual files within the file
system and for Xen disk image files you don't normally want that --
unless you're using a clustered file system in the guests of course.
The right file system for you depends, in detail, what you want to do.
Are there alternatives ?
For Xen virtual disk files there are several alternatives: iSCSI and nbd
both provide access to logical devices across a standard network. That
EMC Celerra I mentioned supports iSCSI as well as NFS and, depending on
what you're doing, you may prefer that. If you have a fibrechannel SAN
or even infiniband you can use those as well.
For my non-production purposes I use NFS because it's easy and fast
(that is, the quickest way to get data between two machines over the
gigabit LAN is using NFS). If I were setting up a production cluster
then I would start with some shared non-local storage and I'd probably
be looking at NFS again or iSCSI and the choice then depends on what the
disk array box supports and is good at. For a system built entirely
out of stock PCs, well, I wouldn't. I wouldn't build a production
cluster of any size that way: I want proper storage.
What you do depends on what you're planning to use these machines for
and how much time and money you're spending.
jch
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