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5 Replies Last post: Nov 9, 2009 8:38 AM by hutchingsp  

iSCSI Switch Recommendations posted: Nov 7, 2009 5:24 AM

Click to view hutchingsp's profile Hot Shot 253 posts since
Jun 21, 2007

I'm looking at putting in an Equallogic PS4000E. Essentially for now we're talking a relatively low cost jump up from a "dumb" iSCSI array, using SATA disks for a specific requirement for bulk but low transaction storage.

In a year or so's time when our main SAN is replaced I'd be interested in getting a more highly specified Equallogic unit, using it as our primary box and moving our main production stuff onto it (we're nearly entirely virtualized already) and putting the PS4000 at the other end of our site as a replication/DR uni.

For now, whilst it's clearly best practise, I don't know if we actually need redundant switches, so what I'm looking for is recommendations on what may be a suitable switch to buy now, with a view to buying more from the same vendor if we standardize on Equallogic.

Dell PowerConnect are the obvious choice I guess. We already have a couple of 5424's in a rack servicing a "dumb" MD3000i at our DR site, we don't push them, they seem to do the job even if the web GUI does suck - I'm assuming they won't be sufficient should we end up utilizing EqualLogic heavily?

There seem to be lots of vendors out there from the names I know, Dell, Cisco, HP, then are lots of "niche" vendors - and I don't know what makes a good iSCSI switch.

We're currently on ESX 3.5 U4 and I would be expecting to be moving to vSphere when our main SAN and ESX boxes are replaced (essentially right now it aint broke so I'm not looking to fix it).

Re: iSCSI Switch Recommendations

1. Nov 7, 2009 4:04 PM in response to: hutchingsp
Click to view sketchy00's profile Enthusiast 31 posts since
Apr 13, 2009

The 5424's are just fine for any of the Equallogic SAN's I run a couple of them against a PS5000 array. The nice part about the switches is that because they are blessed by Equallogic, they provide a nice little document spoonfeeding you the exact settings you need to use them. They aren't stackable, but if you trunk 3 or 4 ports, you'll be fine. They are a good lower cost alternative to more expensive switches.

And for something as critical as an iSCSI SAN, do you really want to put all of your eggs in one basket with one switch? ...never. Use two switches, and pat yourself on the back for doing the right thing.

Re: iSCSI Switch Recommendations

3. Nov 8, 2009 8:41 AM in response to: hutchingsp
Click to view sketchy00's profile Enthusiast 31 posts since
Apr 13, 2009

Yes, it's called the "Dell_Equallogic_Configuration_Guide.pdf" which I will attempt to attach. You will want to look at "Appendix B" In there, you will see the exact steps you need to make the changes. Just to make sure I could repeat the process if necessary, I made some as-built notes, which basically reflect the steps Dell gives. Oh, and make sure you save your new config. ...you wouldn't want anything embarrasing to happen. :-)



Changes needed for configuring switches for the Equallogic SAN.

Assumes one has typed in "enable" to elevate privledges.


  1. Disable iSCSI optimization setting on all SAN switches.

Configure

No iscsi enable

Exit

Copy running-config startup-config

Exit


  1. Enable "portfast" option to configure STP edge ports

Configure

Spanning-tree mode rstp

Interface ethernet g10 (and any other ports used for inter-switch connections)

Spanning-tree portfast

Exit

Exit

Copy running-config startup-config

Exit


  1. Configure (enable) "flow control" (off by default)

Configure

Interface range ethernet g(1-48)

Speed 1000

Duplex full

Flowcontrol on

Exit

Exit

Copy running-config startup-config

Exit


  1. Configure Storm Control (to disable it on all ports)

Configure

Interface range ethernet all

No port storm-control broadcast enable

Exit

Exit

Copy running-config startup-config

Exit


  1. Configure (enable) jumbo frames

Configure

Port jumbo-frame

Exit

Copy running-config startup-config

Exit


  1. Per the Equallogic quickstart guide, disable stp on all ports that don't trunk together the two switches. (p.10)

Re: iSCSI Switch Recommendations

4. Nov 9, 2009 8:33 AM in response to: sketchy00
Click to view AndreTheGiant's profile Guru 5,935 posts since
Aug 28, 2008
No iscsi enable
This tuning is very important on Equallogic cause PowerConnect 5xxx iSCSI optimization does not work well with Equallogic multi-path and load balancing.

Andre

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