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2011 Mar 29
0
Poor IO performance in hosts and VMs - XCP 1.0 b42052
.... The
performance varies greatly, from those peaks of 20-25 to deep troughs
of 2-3MB/s. Writing to an NFS share from a VM is still fine, though -
in-VM NFS performance equals that of a "raw" Ubuntu install.
Furthermore, I have a few hosts with local SSDs meant for database
storage. These Pliant SSDs with on-paper sustained writes of 220MB/s
now look like a nightmare purchase - I get only 20-25MB/s when writing
to them from a VM. (And host performance is not great either - 40-50.
Ubuntu: 150MB/s)
The rather substantial drop as soon as I test iSCSI from a XCP host
leads me to think that so...