Solved

Maximum Datastore size in VM ESXi 4.1

Posted on 2011-02-23
13
3,413 Views
Last Modified: 2012-05-11
I understand the maximum datastore size for ESXi 4.1 is 2GB ( - a few MB's), but is there a way to split a disk group with a 4X1.5TB Raid 5 (4.5TB essentially) so that you have multiple datastores on one LUN?  I understand using extents to combine multiple LUNS into a large single datastore, which is not a good idea, but how do you split one big 4.5TB LUN into two 2GB datastores?  Here is the detail of what I would like to do:

Dell R710 Server with 4 X 1.5TB drives i na Raid 5:

LUN 0 = 4.23TB's

Create

Datastore A = 1.95 TB's
Datastare B = 1.95 TB's
Datastore C = remaining space left on RAID 5
0
Comment
Question by:Beratung
[X]
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
  • 5
  • 5
  • 3
13 Comments
 
LVL 40

Accepted Solution

by:
coolsport00 earned 500 total points
ID: 34965760
You can try creating logical partitions on your array in your RAID Config Utility and see if you can create separate datastores that way. But, you still have 'all your eggs in 1 basket' so to speak (all your VMs on 1 array, albeit on different datastores). Do you have enough bays on your host for more disks to have 2 arrays?

~coolsport00
0
 
LVL 120
ID: 34965781
Do you have a H700 or H800 RAID controller?
0
 
LVL 120
ID: 34965799
Check this controller specification, the Dell H700/H800, you can create Virtual Disks (VDs) of specfiic size and RAID. I believe this is specific to H700/H800, I don't think this feature is available on normal PERC/DERCs.

Page 89.

"You can use part of the available disk space to create one virtual disk and then use the rest of the disk space to create another virtual disk or disks."

http://support.dell.com/support/edocs/storage/Storlink/H700H800/en/UG/PDF/H700H800.pdf

So I'm sure you should be able to card up the 12TB, into less than 2TB chuncks, and either create approx 6 datastores, or add extents.
0
Migrating Your Company's PCs

To keep pace with competitors, businesses must keep employees productive, and that means providing them with the latest technology. This document provides the tips and tricks you need to help you migrate an outdated PC fleet to new desktops, laptops, and tablets.

 
LVL 120
ID: 34965814
ignore the nonsense at the end! (another question!)
0
 
LVL 120
ID: 34965825
Create one large array, and then carve it up into smaller chunks, these will all appear as different datastores in VMware ESX, what I call logical disks, but I think dell calls them virtual disks.
0
 

Author Comment

by:Beratung
ID: 34965858
Forgot to add the Controller info.  Sorry.  It is a PERC 6i, which from what I can see (or not see) in the BIOS conif utility is you can't carve up the array.  uh!
0
 

Author Comment

by:Beratung
ID: 34965870
More info.

Six 1.5tb disks configured this way on PERC 6i

2X1.5TB for RAID 1 array
4X1.5TB for RAID 5 array
0
 
LVL 40

Expert Comment

by:coolsport00
ID: 34965887
Is there a reason why you don't want to have 3 1.5TB RAID1 arrays?

~coolsport00
0
 

Author Comment

by:Beratung
ID: 34965896
To coolsport00's question...

There will be database servers on this VM that we would lose the advantage of RAID 5 write performance as well as only get 4.5 TB out of it instead of 6TB using RAID 1 and 5
0
 

Author Comment

by:Beratung
ID: 34965900
Correction RAID 5 READ performance would be lost
0
 
LVL 120
ID: 34965991
No, unfortunately, you do not have the function on the PERC.
0
 
LVL 40

Expert Comment

by:coolsport00
ID: 34966191
Hmm..ok, well, without the option to create logical (virtual) drives in your controller, you have no other option than to 1. increase the drives you have in your bay (if there are open bays), or 2. create 3 RAID1's, which you've already mentioned you aren't wanting to do. Your problem is having a 2TB limit.

~coolsport00
0
 

Author Closing Comment

by:Beratung
ID: 34966201
This actually was the solution.  Was able to add multiple VD's in Controller Bios after wiping out existing. Createing multiple VD's create multiple LUNs in the VM Server which translate to many smaller Datastores.
0

Featured Post

Major Incident Management Communications

Major incidents and IT service outages cost companies millions. Often the solution to minimizing damage is automated communication. Find out more in our Major Incident Management Communications infographic.

Question has a verified solution.

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

Suggested Solutions

This article will show you how to create an ISO CD-ROM/DVD-ROM image (*.iso), and MD5 checksum signature, for use with VMware vSphere Hypervisor 6.5 (ESXi 6.5). It's a good idea to compare checksums, because many installations fail because of a corr…
In this step by step tutorial with screenshots, we will show you HOW TO: Enable SSH Remote Access on a VMware vSphere Hypervisor 6.5 (ESXi 6.5). This is important if you need to enable SSH remote access for additional troubleshooting of the ESXi hos…
Teach the user how to configure vSphere clusters to support the VMware FT feature Open vSphere Web Client: Verify vSphere HA is enabled: Verify netowrking for vMotion and FT Logging is in place or create it: Turn On FT for a virtual machine: Verify …
This tutorial will walk an individual through the steps necessary to enable the VMware\Hyper-V licensed feature of Backup Exec 2012. In addition, how to add a VMware server and configure a backup job. The first step is to acquire the necessary licen…

734 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