IVR (Inter-VSAN Routing) - Best practices questions

Hi there,
We have a situation where we will have multiple customers hosted on a 9513 and sharing a single storage array.
We want to keep the logically seperated in their own VSANs, but of course the storage array will need to be zoned to all the customers hosts.
Now IVR should be the thing to use, but I'm getting resistance from the local team (screams of "Nooooo!!! They're EVILLLLL!!!") ... so I want to find out if there are some best practices around IVR use ?
Should they be used only for light duty stuff ? (though at present we use them with tape backup, which isn't exactly "light")
Do they impact performance to a measurable degree ?
Are they stable ?
What can go wrong with them ? And does it happen often ?
Thanks!

IVR does not impact application I/O performance because all the vsan rewrite and fcid rewrite actions are done in hardware asics. The IVR process on supervisor is responsible for managing the configuration and ensuring the rewrite tables are programmed in the linecards. The process is stable.
Most of the issues I have seen are in environments with multiple IVR enabled MDS switches ISL'd together or an MDS IVR enabled switch connected to a McData/Brocade in an interop mode.
Like any feature there have been bugs and it pays to check the SAN-OS release notes when planning installs. For example, a config change on one switch does not get properly pushed to another IVR switch or a forwarding table for an ISL interface does not get correctly programmed. There have also been a fair share of user misconfigurations which could have been avoided if Cisco Fabric Services (CFS) was enabled for IVR. This is done with the 'ivr distribute' command. Without this it is very difficult in large topologies of multiple IVR switches to ensure they have a consistent IVR config. In other cases there have been problems from a mix of IVR enabled switches running different releases of SAN-OS, e.g. mixing 3.0 with 3.2.
Best practice is to have dual physical fabrics, upgrade one fabric at a time ensuring all IVR switches in a fabric run same SAN-OS release.
A single IVR switch is much easier to implement. The MDS Configuration Guide has a list of best practices for IVR and one of those is to use the NAT option. Personally I would avoid NAT option where you can as NAT makes any troubleshooting harder trying to figure out the domain ID translations. You would also minimize risk of hitting some NAT related bugs, but you could also avoid most of these by checking the workarounds documented in the Release Notes. And with NAT you need to also configure persistent virtual domains and fcids to cater for AIX and HP-UX systems that cannot handle the FCID of the target changing whenever the exported virtual domain ID changes. To give NAT credit, each vsan is represented by a single virtual domain. In regular non-NAT mode, each switch in a vsan is represented by a virtual domain, meaning you eat up more virtual domain IDs. So in large topologies with many domain IDs there are scalability advantages to using NAT and the IVR updates between switches are more efficient with fewer virtual domain IDs to advertize. Of course, NAT must be used if merging physical fabrics with same domain ID and you cannot afford the downtime to change one of the switch domain IDs.
However if it is just a single IVR switch I would avoid NAT. To do this all your domain IDs should be statically defined and there must be no overlapping domain IDs between IVR'd vsans. If it is a brand new install you can easily achieve this by specifying unique allowed domain ID ranges per vsan.
For example, each customer can have their own vsan with say 10 domain IDs and the storage can be in vsan 2. You will only use one domain ID per vsan on day 1. Allowing 10 domain ids per vsan means you can add up to 9 other switches per vsan should you need to in the future. There is a maximum 239 domains per vsan so you could have up to 23 customers on your 9513 working with a range of 10 domain IDs per vsan.
fcdomain domain 2 static vsan 2
fcdomain domain 10 static vsan 10
fcdomain domain 20 static vsan 20
fcdomain domain 30 static vsan 30
..and so on..
fcdomain domain 230 static vsan 230
fcdomain allowed 01-09 vsan 2
fcdomain allowed 10-19 vsan 10
fcdomain allowed 20-29 vsan 20
fcdomain allowed 30-39 vsan 30
..and so on..
fcdomain allowed 230-239 vsan 230
With or without IVR you should still run dual fabrics (e.g. 95xx in each fabric) and host based multipathing for redundancy.
And don't forget IVR will require an Enterprise license. I have even seen a large outage because the customer forgot to install the license before the 120 day grace period expired.

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SAP Adapter Best Practice Question for Migration of Channels

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Hi,
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Thanks
<Neeraj Sidhaye/>
Try_Catch_Finally AT YAHOO DOT COM
http://ExtremePortal.blog.co.uk

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Hello user,
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2. FormBean.java contains standard getters/setters but also contains a method called sendMail(), is this bad practice? Do I need a second Bean sendMail.java? A better approach is this way
a) Have all the form data in the form bean
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This way your sendMail() will become a kind of a service. Tomorrow you might have some other data, which you will have to send it in an email. In that case, you just reuse sendMail() method. Otherwise, if you have sendMail() in form bean itself, then if there are many form beans, then you would have to write sendMail() in every form bean, which is a bad practice. One principle of OOAD is to separate the functionality, which is redundant in your classes and make it as a separate module. If there are changes to the sendMail() functionality then, by having it in one module, you only have to change it at one place.
Or is this completely the wrong way to do things i.e. should I do this entirely in a servlet with only 1 bean to grab the data (FormBean) and then access from servlet?You can have a servlet which acts like a controller, which receives the request parameters, constructs the form bean and invokes appropriate Action (in your case sendMail()). This is same as an MVC framework. Instead of you re-inventing the wheel to create a servlet controller, form bean, action etc. You could use one of the several MVC frameworks available in the market, such as Struts or Spring MVC.

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Consider this example:
TABLE: SALES_DATA
firm_id|sales_amt|d_date|d_data
415|45|20090615|Lincoln Financial
415|30|20090531|Lincoln AG
416|10|20081005|AM General
416|20|20080115|AM General Inc.
I want the output to be grouped by firm_id with the sum of sales_amt and the d_data
that corresponds to the latest d_date (i.e. max(d_date))
Proposed query:
select firm_id, sum(sales_amt) total_sales, substr(max(d_data), instr(max(d_data), '~') + 1) firm_name from (
select firm_id, sales_amt, d_date || '~' || d_data from sales_data
group by firm_id
output is as expected:
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416|30|AM General
I know this works but my QUESTION is: is there a better way to do this and is the above approach to concatenate columns when you want to aggregate multiple columns against any best practices.
Thanks very much!

Here's a way that uses analytics (I just like them):
SQL> select * from sales_data;
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                 415                   45 15-JUN-2009 00:00:00 Lincoln Financial
                 415                   30 31-MAY-2009 00:00:00 Lincoln AG
                 416                   10 05-OCT-2008 00:00:00 AM General
                 416                   20 15-JAN-2008 00:00:00 AM General Inc.
SQL> select firm_id, sum_amt, d_data
2 from
3 (
4     select firm_id, d_data
5           ,sum(sales_amt) over (partition by firm_id) sum_amt
6           ,row_number() over (partition by firm_id order by d_date desc) rn
7     from   sales_data
8 )
9 where rn = 1
10 ;
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                 415                   75 Lincoln Financial
                 416                   30 AM General

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I was reading this post:
http://blogs.technet.com/b/askpfeplat/archive/2013/03/10/windows-server-2012-hyper-v-best-practices-in-easy-checklist-form.aspx
and I saw two things, one where it says fiber channel is not support and one where is says loopback is not support?
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san lun? and if a san, would virtual stuff like IBMs SVC be supported?

Using a SoFS with SMB3 as a Storage for Hyper-V and SQL Server/Clusters is Microsoft Nr.1 and you will see more and more push for that Design in every next Version.
The TOP Features for me in that Combo is, you get 100% of all Features on Day One when new Version comes out, within Microsoft SMB 3.x are some realy sexy Things in it and you can use all the Standard Ethernet Stuff yu have and know already for years. If
you Need super Speed you can do that with some RDMA Cards, still Ethernet :-) and if you do a Live Migration between any Combo of Clusters and Single Nodes you never Need to move the Data and Config Files :-) they always stay on
\\SoFS\VMs :-)
All Information you need are on http://smb3.info , Jose, my Mr. SoFS collects and blogs about all Features and Step-by-Step Guides to test and prove that even on one sinlge Notebook, very very cool.
As a Backend fot the SoFs you have many choices, from the new Wave of JBODs togehter with Storage Spaces up to the old Style SAN Boxes with or without Special Features. Allways check the Windows Server Catalog for supported Confgs, specially on the JBOD
Side, make sure you get one with R2 Support und also with SES Support (SCSI Enclosure Services ). Jose also Blogs about that Topics very well.
https://blogs.technet.com/b/storageserver/archive/2013/10/19/storage-spaces-jbods-and-failover-clustering-a-recipe-for-cost-effective-highly-available-storage.aspx
http://www.windowsservercatalog.com/results.aspx?&chtext=&cstext=&csttext=&chbtext=&bCatID=1642&cpID=0&avc=10&ava=0&avq=0&OR=1&PGS=25&ready=0
Hyper-V Cluster up to 64 Nodes and SoFS up to 8 Nodes depending on your Scaling Needs and having Storage splitted over separat DataCenters should be a good start :-)
Just let me know of you need some Advice after doing a Design Session.
Udo

BEST PRACTICE QUESTION: XI or direct R/3 RFC?

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Question: What is the best practice defining whether or not we should pivot thru XI? This is a single interface that will not be reused; there would be no mapping within XI; and the call must be real-time and syncronous.
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Hi,
the best practice is :
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I have used the tutorial provided by Business Objects and have successfully passed a dataset from C# code to Crystal Reports.
I have a few questions about "best pratices" though.
It appears that when passing the dataset to crystal then you no longer have the ability to put SQL Expressions in the report anymore otherwise errors will occur.
So, I'm trying to come up with a way to have a custom field in the SELECT statement and have it show up on the report as a field. So, in the below example I created a custom SQL field called TIMES7 in the query.
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If I create a formula field in Crystal and set it's value to {MULCRICKET .TIMES7} then it works like a hybrid SQL Expression at run-time.
This does work but has issues because the database field doesn't really exist in the design environment which causes error when the formula is saved. But it does work at run-time.
I was wondering if their was a best practice for this?

So why are you using a formula that doesn't work? If it errors in the designer it's telling you it's not supported.
Drop the formula into a filed and hide it if you don't want it displayed, this way it gets into the record selection formula.
"Best Practices" is don't use formulae that won't verify in the Designer. "If it doesn't work in the designer it won't work in code"
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IVR (Inter-VSAN Routing) - Best practices questions

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