Good point. So there is value to bonding on the link to the NAS, but
only to the degree that he has simultaneous significant demand from
multiple devices in his home.
--Ted
On 12/6/2016 2:05 PM, Adam Levin wrote:
If you do use a port channel, keep in mind that you're still only going
to get 1Gb (or whatever the speed of one component link in the LAG is)
to any given host, and for any given single conversation. In other
words, you're not going to get a single stream of data from host to
storage (or host to host) to go any faster than 1Gb due to the hashing.
Even round robin outbound requires the switch to select an inbound port
to the destination, so unless you're doing large-scale fan-in or
fan-out, it's not really that useful.
-Adam
On Tue, Dec 6, 2016 at 4:44 PM, Ted Cabeen <[email protected]
<mailto:[email protected]>> wrote:
On 12/6/2016 1:09 PM, Jesse Becker wrote:
I currently get 72+MB write and 85+MB read from the NAS
You aren't going to get more than ~100 MB/sec out of a 1G link under
real-world conditions. Granted, going from 72MB/sec to 100
MB/sec is
a 38% improvement, but don't expect anything more. Now, if
latency is
the problem, instead of throughput, that's a different issue.
Yep, the overhead is the big factor. You're not going to get much
more than a 20-30% improvement, regardless of the drives you add. I
have a multi-drive flash-cache-backed NAS with a 10Gbit up-link, and
from a 1 Gigabit-Ethernet connected client, the fastest I can pull
data is 97 MBps over CIFS.
If you really need more speed, I'd recommend upgrading your Drobo
and PCs to have multiple Gigabit Ethernet ports, and bonding
together those ports to create a 2Gbps link for each device.
--Ted
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