On 11/8/2012 12:35 PM, Edward Ned Harvey
(opensolarisisdeadlongliveopensolaris) wrote:
From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss-
boun...@opensolaris.org] On Behalf Of Jim Klimov
the VM running "a ZFS OS" enjoys PCI-pass-through, so it gets dedicated
hardware access to the HBA(s) and harddisks at raw speeds, with no
extra layers of lags in between.
Ah. But even with PCI pass-thru, you're still limited by the virtual LAN switch
that connects ESXi to the ZFS guest via NFS. When I connected ESXi and a guest
this way, obviously your bandwidth between the host& guest is purely CPU and
memory limited. Because you're not using a real network interface; you're just
emulating the LAN internally. I streamed data as fast as I could between ESXi and
a guest, and found only about 2-3 Gbit. That was over a year ago so I forget
precisely how I measured it ... NFS read/write perhaps, or wget or something. I
know I didn't use ssh or scp, because those tend to slow down network streams quite
a bit. The virtual network is a bottleneck (unless you're only using 2 disks, in
which case 2-3 Gbit is fine.)
Also, supposedly vmxnet3 interfaces implement a 10gig nic. I haven't
tried that recently due to bugginess in the solaris driver...
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