Legacy Product Discussions

ESH module

saranraj456

HI,

What is an ESH modue and why it is used?

How the disks are connected to it?

Can anyone pls provide the document related to it..

Regards,

Saran

17 REPLIES 17

Re: ESH module

shaunjurr

Hi,

You can find the answers to many of your questions at now.netapp.com .  The ESH module is a FC switching hub.  The rest is up to you to read up on first... or try to...

Re: ESH module

mcope

The ESH is is a shelf controller module for the DS14 disk shelves (which we've all but stopped selling).  Each shelf requires two modules. They came in ESH, ESH2 and ESH4 (1Gb/s, 2Gb/s, 4Gb/s).  The most recent versions of Data ONTAP only support ESH2 and ESH4 modules.  As Shaunjurr mentioned, they managed the Fibre Channel Arbitrated Loop and mediate I/O requests between the storage controller and the disk shelf.  You can think of them as network hubs for disk shelves. 

A quick search of the NetApp Support website didn't turn up a document specifically for the ESH (it's considered a subcomponent, which rarely have separate documentation), but most of what you need to know is in the DS14 shelf guide.

http://now.netapp.com/NOW/public/knowledge/docs/hardware/filer/210-01431.pdf

Re: ESH module

saranraj456

Thanks for your answer!!

I want the connectivity diagram(how many disks are connected) between the disk and ESH module?

And also, what is need to have two modules in a shelf?

Re: ESH module

AdvUniMD

Of cours, all disks in the shelf are connected to the ESH module. Otherwise you couldn't access the disks. That's 14 disks. Also, you need 2 ESH modules for redundancy

-Michael

Re: ESH module

mcope

What are you trying to do?  The shelves come with everything you need.  You just connect them to other shelves or to the storage controller following the procedures in this guide: https://now.netapp.com/NOW/public/knowledge/docs/hardware/filer/210-01431.pdf

Re: ESH module

JOHNJOHNT

Hi Michael,

I too have some questions on this topic. I am a NetApp newbie, and picked up a DS14 with dual X5501A LRC adapter to play with. What would I need to connect this to my system? And what the is the difference between LRC and ESH?

Appreciate the help in advance.

-John

Re: ESH module

aborzenkov

LRC is out of support from hardware point of view and is not supported by Data ONTAP as of 7.3. You would need optical multimode cable; LRC side is SC, filer side is usually LC (I do not remember SC adapters). There were several different types of LRC modules – for direct connection to controller and for connection to another LRC. You need the former. You can’t mix LRC and ESH on the same loop.

Re: ESH module

saranraj456

Can anyone pls provide me the front and rear view of ESH module?

Thanks!!!

Re: ESH module

tjlee

Hi,

There is really no front view to the ESH modules, as it’s a module that plugs into the controller.

As for the rear view, page 16 of the docs <https://now.netapp.com/NOW/public/knowledge/docs/hardware/filer/210-01431.pdf> provides that:

Cheers, Tony

Re: ESH module

mcope

Ebay is a great source of info and pictures of old gear. http://cgi.ebay.com/NetApp-2x-2Gb-Optical-Copper-ESH-X5506A-DS14MK2-Module-/360366210388?pt=COMP_EN_Networking_Components&hash=item53e77ffd54#ht_1422w...

Note: NetApp does NOT provide any support or licenses for after-market or grey market gear so if you buy components from anyone but an authorized NetApp reseller, you are on your own.

Re: ESH module

saranraj456

Micheal.

Whether both the modules are in a active / active node?

Thanks in advance

saran

Re: ESH module

AdvUniMD

Yes they are active/active

ESH module

andrc

One of the downsides of LRC as compared to ESH was that one bad disk could cause the whole loop to fail, whereas ESH identifies bad disks and effectively bypasses them. If you intend to use your DS14 shelf for production data then I recommend purchasing some ESH modules, you should be able to pick them up pretty cheaply but just make sure you download the latest FW for them from NOW.

View solution in original post

Re: ESH module

saranraj456

How to find the info related to ESH module in CLI/Filerview?

Cheers,

Saran

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