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4Aug/112

EqualLogic Replication over Nortel ERS 5500 Series – When disaster stikes!

If you have been keeping upto date with my previous blog articles, you will know that we have recently taken delivery of a Dell EqualLogic PS6000 32TB. My intention is to use this as a replication partner for our existing PS Series Group.

With the new EqualLogic initialized and firmware upto date, I continued to set up replication, this was again as expected with EqualLogic a quick and painless task, I will blog on setting up replication in another article.

For the initial replication we co-located our new EqualLogic in the same Datacentre as our current PS group, created replication schedules and away it went all volumes replicated and continuing to replicate on an hourly schedule, no issues what so ever. All of this on our backend iSCSI network of course.

The next task was to move our replication partner to our secondary Datacentre accross the other side of our site in a seperate building, to offer onsite replication. the link to this secondary Datacentre is a 6GB MLT using Nortel/AVAYA as now is, Ethernet Routing Switch 5500 Series. We needed a way of transporting this backened iSCSI traffic over our current network infrastructure.

6Jun/114

Dell PowerConnect 5400 Switch config for EqualLogic iSCSI Network

At this current moment we use 2 PowerConnect 5424 switches for our iSCSI backend network.  The PowerConnect 5424 has 24 10/100/1000 BASE-T auto-sensing gigabit Ethernet switching ports and 4 SFP combo ports for fibre connectivity.

The PowerConnect series of switches have many good features some which are irrelevant to what I am talking about so I will leave this out and comment on the features which are important in relation to iSCSI backend networks. Notice I say backend, if this were not a backend network I may be interested in some of the other features such as multiple VLAN capability and iSCSI optimization and QOS. But as this is a backend network I will not require the use of multiple VLANS or iSCSI optimization as I don't see the need to optimise iSCSI on purely iSCSI network.

   
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