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

[Jim Klimov]

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