Re: [Xen-users] iSCSI vs NFS

[Frank Pikelner <frank.pikelner@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

>         
> "Tests show". Famous last words...  I've been throwing around a lot of
> ideas in this same vein. I currently have 42 VMs running off the same
> disk in a classroom environment. Things are fine until everyone starts
> installing software or formatting their disks at the same time.
> 
> From the hearsay that I've heard AoE is the fastest network block
> storage but it's still hard to beat NFS. The problem comes about when
> you want more than one VM to access a storage device and then
> performance goes in the toilet because the cluster FS's are very slow.
> I however, don't make decisions based on hearsay so in the coming
> months I'll be testing all combinations of NFS, iSCSI, AoE, with GFS
> and OCFS and any other possibility I can find in common kernels. I'll
> be comparing these to the speeds of local disk access via ext3 to see
> how much of a hit (or advantage?) we take by moving storage out of
> box. Of course to do fast migration the storage has to be somewhere
> else...
> 
> Once testing is done I'll be posting the numbers. It's amazing how
> little benchmarking takes place. I did extensive tests on LVM vs disk
> files and have still not seen any other numbers on this. Oh well, I
> guess that will be my contribution.

Grant,

With what type of drives are you expecting to do the testing? I would be
interested in any numbers, but have started to move over to solid state
drives.

Best,

Frank


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