[OpenIndiana-discuss] Linux software-raid with two Comstar iSCSI volumes

[Michael Stapleton]

FYI, there is a setting that controls how Solaris balances the frames
across the links in the aggregation.
IP, MAC or round robbin.

Mike



On Sat, 2012-11-17 at 01:19 +0100, Jim Klimov wrote:

> On 2012-11-17 00:46, Roel_D wrote:
> > How about teaming? Is it supported under OI?
> 
> 
> My memory serves me not worse than google: teaming is one of the
> umbrella terms to describe what is implemented by LACP - a means
> of representing several hardware links as one logical NIC with
> increased reliability and bandwidth. Other vendors call (their
> proprietary implementations of) this technology as NIC bonding,
> EtherChannels, etc. In Solaris these are known as "aggregations"
> (see "dladm create-aggr ...").
> 
> BEWARE THAT sometimes the boost in bandwidth is not easy to see,
> because certain implementations switch connections between a
> couple of MAC addresses using one link, and only if you have
> lots of different hosts you get more bandwidth on the average -
> but a single GbE between a couple of nodes. This is likely a
> problem in the storage scenario, at least with one NAS server.
> 
> "Teaming" usually requires support on the switch side and while
> many managed switches provide LACP or a proprietary analog of
> this protocol across ports in one device, few allow spanning LACP
> domains over separate switches (as was touched on earlier in the
> thread).
> 
> HTH,
> //Jim
> 
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