Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people, just like you, are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
Solved

Vmware Luns on HP storage

Posted on 2011-09-28
6
1,095 Views
Last Modified: 2012-05-12
Hi,
I am just after a few expert comments about how best to carve up a new SAN to work with ESX 4.1

This is hyperthetical at the moment, but currently our existing HP EVA San has 4 disk groups, each with a bunch of disks from various trays based on type of disk etc.  The disk groups are then split up in to VDisks and presented to servers. Most of the VDisks we created were around the 500GB, some smaller, some larger

The Vdisks were then presented to the ESX Cluster and formated for use on ESX.

My question is, is it better to create slightly larger LUNS, of around 2TB each, or smaller ones of about 500GB each and then spread guests around between them?

I just have the opportunity to start again and wanting to know some thoughts.

Please don't just send me links to white papers I am after personal experience examples if possible.

thanks Experts!
0
Comment
Question by:Steven Wells
6 Comments
 
LVL 42

Accepted Solution

by:
paulsolov earned 125 total points
ID: 36812997
I would recommend 500 to 750GB vdisks as too many VMs on a LUN can lead to contection.  I have setup ESX/ESXi hosts on several EVA 6400 and will be doing 6500s soon.  Up to 1TB works well and gives you room to grow if you find that you're running out of room on the LUNs.   With the new vSphere 5.0 you can let the system move the VMs to lower tier storage such as FATA drives if the performance requirements aren't there.

Are you looking to use BC/CA?

0
 
LVL 12

Author Comment

by:Steven Wells
ID: 36813161
I like the idea of larger luns too. I have noticed that there is quite a bit of waste when using smaller ones, espeically snapshots etc.  Will be using it as part of a 6-7 server cluster if that is what you mean.
0
 
LVL 23

Assisted Solution

by:Luciano Patrão
Luciano Patrão earned 125 total points
ID: 36813171
Hi

As paulsolov stated, smaller LUNs is better than large ones. Performance, think maintenance etc.

I use between 700/800Gb always.

Do not forget that you need ate least 30% more space for headroom. Also VMware recommends the maximum 15 VMs on each LUN.

For EVA/MSA the RAID Group default is RAID5, that is ok for most of Datastorage.

If you need any particular VDisk for some special VMs(like Exchange, SQL, etc.) then you should check best practices(Like RAID 5 for OS and RAID1+0 for data/log) for this type of VMs.

Hope this can help

Jail

0
NAS Cloud Backup Strategies

This article explains backup scenarios when using network storage. We review the so-called “3-2-1 strategy” and summarize the methods you can use to send NAS data to the cloud

 
LVL 119

Assisted Solution

by:Andrew Hancock (VMware vExpert / EE MVE^2)
Andrew Hancock (VMware vExpert / EE MVE^2) earned 125 total points
ID: 36813960
Personally,  we always use 500 - 700GB LUNs, unless there is a need to create supersized LUNs for larger VMDKs.

Also spread the virtual machines between your LUNs, and do not put all like VMware Virtual Machines like Exchange Servers and SQL Servers all on the same LUINs, spread them over different LUNs.
0
 
LVL 17

Assisted Solution

by:Gerald Connolly
Gerald Connolly earned 125 total points
ID: 36818273
One of the EVA's strengths is its ability to expand disk groups easily, just add disks to a group and all the VLUNs get spread across the new spindles automatically. Extending the size of a LUN is just as easy.

So choosing a size to start with is not a big problem as you can expand it later.
0
 
LVL 12

Author Closing Comment

by:Steven Wells
ID: 36818585
Thanks for all your input.
0

Featured Post

Free Tool: ZipGrep

ZipGrep is a utility that can list and search zip (.war, .ear, .jar, etc) archives for text patterns, without the need to extract the archive's contents.

One of a set of tools we're offering as a way to say thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Exchange server is not supported in any cloud-hosted platform (other than Azure with Azure Premium Storage).
Finding original email is quite difficult due to their duplicates. From this article, you will come to know why multiple duplicates of same emails appear and how to delete duplicate emails from Outlook securely and instantly while vital emails remai…
This video teaches viewers how to encrypt an external drive that requires a password to read and edit the drive. All tasks are done in Disk Utility. Plug in the external drive you wish to encrypt: Make sure all previous data on the drive has been …
This Micro Tutorial will teach you how to reformat your flash drive. Sometimes your flash drive may have issues carrying files so this will completely restore it to manufacturing settings. Make sure to backup all files before reformatting. This w…

829 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question