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938
April 24th, 2012 04:00
iscsi initiator setup -basic scenerio & question
We currently have...
One server with two HBA's 192.168.1.1 and 192.168.2.1
One AX4-5i
SPA0 192.168.1.100
SPA1 192.168.2.100
SPB0 192.168.1.101
SPB1 192.168.2.101
All connections go into a switch (I know it should be one switch for each subnet).
There is one disk configured on the ax4-5i
When i attempt a discovery, which IP should I use to find the targets?
Do the targets refer to the "disk", or to the four iscsi SP ports?
(In other words would I expect to see one target or four targets)
If get four targets would I wish to connect to all of them?
My understanding is it does not matter which IP I use for discovery, and I should see four targets which I should connect to, as this makes MPIO redundancy available.
kelleg
4.5K Posts
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April 25th, 2012 07:00
On PowerLInk, search in Support Solutions for emc245445 - this lists all the articles about iSCSI. Then see emc156408 - this provides the best practice for configuring the array and hosts for iSCSI. If you're using Windows or ESX - also look for the articles about "TCP Delayed ACK" - this should be disabled on all host operating systems.
Each EMC Host Connectivity Guide for the different operating systems have a section for iSCSI. On PowerLink, you can Find this under Home > Support > Technical Documentation and Advisories > Host Connectivity/HBAs > Installation/Configuration.
For iSCSI on the CLARiiON arrays, we recommend that you do not use 192.168.1.x subnet. THese are used internally and may cause issues.
When you "discover" the array you only need to use one of the IP arrays from the iSCSI ports on the array - the discovery process should then find all the iSCSI IP's on the that array - you do not normally need to supply all of the array's iSCSI IP addresses.
g;em
Madhug1
2 Intern
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127 Posts
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April 24th, 2012 08:00
Hi,
I would recommend you to download and install the Unisphere Server Utility, using which you can configure iSCSI connectivity easily, when you have four paths, you need to ensure that all the fours paths are logged in so that it can see the target. you can see all the iSCSI paths using Unisphere Server Utility with their status.
Since you are using MPIO, it would take care which path to use.
Thanks
Madhu