EMC World Day 2

Haven't done much yet this morning. I have been listening to the general session from within the bloggers lounge (as best I can...it is echoing like crazy). I also picked up my armband for the ECN appreciation event tonight (if you are registered, you get the armband from the kiosk right outside the bloggers lounge).





Other than that I have just enjoyed the breakfast that was provided and tried to catch up on email from work. I do have to say I was very excited they had strawberry-rhubarb jam at breakfast. I know, but the little things can help put your day on a good track.


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Location:EMC World 2013 Las Vegas

Day One at EMC World

I got some good information today. I attended an Isilon session and all I have to say is wow. Can't wait to get one in where I work. The updates that will be hitting the OneFS platform are incredible.

I also sat in on an FAST Cache for VNX session. I have a pretty good grasp on the technology now but I did learn a few things that I didn't know before. One thing that I look forward to is using XtremeSW and FAST Cache in our environment for both some of our SQL and ESX servers. Goog times, good times.


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Location:EMC World 2013

EMC World 2013

The conference started today and the first plus is Wifi is working great so far. Last year's EMC World it was iffy at best. There also seems to be more energy this year. I have to admit I was very underwhelmed last year.

I am looking forward to the sessions to see what new toys are going to be released in the next year. Hope to have some cool things to blog about.


- Posted using BlogPress from my iPad

Location:EMC World 2013 Las Vegas

EMC World 2012

This is going to be something that I update this week while I am at EMC World 2012.  So far, other than the WiFi on the upper floors, it has been great.  The two sessions that I attended in the morning were very informative.  The first session this afternoon was good, just really didn't match the description in the catalogue.  It was very specific and dealt with a third-party solution and not just VNX and HPC like the catalogue stated.  Oh well, at least I learned something.

Since I am waiting for the next session to start I decided to go down to the Blogger's area. Looks really close to what it did in 2009.




Fast forward to Wednesday. The sessions have been good, although I did run into another one that didn't quite live up to what the course catalogue described. Currently my opinion of EMC World 2012 is that it is "okay". The vendor area seems a little lacking and there are empty booths. With today's economy I can understand that. My biggest complaint has been the spotty Wifi. I guess since this Vegas they want you to gamble on if you are actually going to be able to connect or not.

I am excited to get back to the office and implement some of the software releases and upgrades that I have seen. Two of the main ones are Unisphere for VMAX and on Monday version 1.6 of Prosphere was released. I got to see what Unisphere for VMAX looked like and it looks like it is going to be a very handy tool to use in our enterprise.

A change from basic to dynamic disk

Here is a little history about what we (meaning the server team at the company I work at) have done in the past.  When we have a server with large SAN (Storage Area Network) attached drives (any size, including ones that are a Terabyte plus) we would attach that drive to the server as a basic disk.

Before I get into the “why” I am going to go over what a basic and dynamic disk is as it pertains to Windows 2003 and 2008.

Basic Disks:

• These use a partition table to manage the partitions on a disk.  This type of disk is supported on all versions of Windows.  
• A basic disk can contain basic volumes (a volume is a single accessible storage area with a single file system and may or not be a single partition on a hard disk) which includes primary partitions, extended partitions, and all logical partitions contained within an extended partition

Dynamic Disks:

• Supported in Windows 2000 and later (with Windows XP it is only supported on Windows XP Pro).
• They do not use a partition table.  In place of the table, they use a hidden database to track information about dynamic volumes.
• A Dynamic volume can be a simple volume, a spanned volume, a striped volume, a mirrored volume, and a RAID-5 volume.
• You can perform disk and volume management without restarting windows (the same can be said about basic volumes as well as you can use DISKPAR and extend the volume).

Granted, that is just the high-level information about each of the volume types, but it gives us a picture of what I am talking about.  

Now for the “why”.  Most of the Windows servers in our organization use Clariion storage as the backend.  Going back to the fact that we have been using basic disks as our standard, one would assume that we are using really large LUNs assigned from a single RAID group.  Luckily, that is not the case.  Why is that lucky?  Wel,l to put it simply spindles = performance.  A single RAID group on a Clariion usually only has 7 disks in a 6+1 RAID configuration.

So that we can provide these servers with more spindles (mostly used in large LUNs), we create LUNs across multiple RAID groups and “extend” a LUN to utilize all of these spindles.  When we present this expanded LUN to Windows and it only sees one disk.

Now that I am done with the “why”, that brings us to today.  We are in the process of installing a new NS480 (a Clariion with a Celerra Datamover from EMC).  This new NS480 is going to be using FAST2 technology from EMC.  What this means is that the whole idea of worrying about creating META LUNs to provide more storage is “out the window”.  

Why you might ask?  To utilize FAST2 we need to create pools of storage.  A pool is multiple RAID groups and disk types “pooled” together.  For example, I could have SATA, Fiber, and EFD (flash drives) in the same pool.  They will be grouped together on the backend just like before in RAID groups, but we (the admins) won’t have to worry about what kind of disk we want to provide to the user.  Granted, there is some configuration and monitoring we will have to do to ensure that proper type of disk is being given to the application when it is needed, but the point is we will just carve up a LUN and give it to the server.  When using pooled storage, you no longer use META LUNs.

That sounds great doesn’t it?  I just need to carve up a LUN, no matter the size, and present it and it has access to all those different types of drives and all those spindles if it needs it.  Well, lets stop and think about this.  I create a few really big LUNs and try to balance them by how big they are between the pools.  Easy enough.  However, lets say that one of those really big LUNs are getting pounded on because someone is running a SELECT * from Table to look for a name of a customer, and they do this ALL THE TIME.  Now I have one pool that is being utilized performance-wise a lot more than the other.  In essence, I will be stranding the remaining storage because if I keep adding hosts to that pool the performance will keep going down.  As you can guess, we don’t want that to happen (we know this all to well).

Okay, how do you fix this since I can’t use META LUNs to spread the I/O (Input/Outputs) between those pools?  Well, we have to look at how we are presenting our disk to our Windows servers.  Since a basic disk is just that, a single disk, that won’t help us.  However, if we use dynamic volumes that can span multiple disks (in this case LUNs presented from the SAN), we can stripe them and use both pools to spread that I/O load out and keep from orphaning as much storage.  I say “as much storage” because it will be inevitable that you will reach your I/O load before you carve up all those nice terabytes into LUNs.

Even if we change from basic disk as a standard to dynamic disks we will still be able to do many of the things we used a basic disk for (with a few caveats).

• We can swing a dynamic disk from one server to another in the event that a server is down
• We can grow that dynamic volume at anytime (as long as that partition was not a basic partition first).
• We can...well those were the two main reasons we used them.

If you have any questions or comments please feel free to post them (as the blog title says, I am a newbie).

Hello from EMCWorld 2009

Well, I figured I needed to start a storage blog. I also figured that starting from EMC World would be pretty cool. I have been doing storage for two years and feel that there is plenty for me to learn still. I will be using this to go over concepts and going over "how-to's" in the world of storage.

A little about my thoughts about EMC World this year. The day zero get together was very fun. Food was good and surprisingly enough the Gin Blossoms were good as well. I am sitting here in the bloggers lounge trying to hear the keynote (not going well but, eh). The breakfast, being picky here, was something to be desired. I was not impressed. Another note, they didn't offer coffee outside of the breakfast until 09:30 ET...I NEED MY COFFEE!!

There are a lot of really good sessions so I hope to get some good information from the show that I can take back and utilize in my day-to-day activities.