Query regarding best practices around using IBM DS3524 free capacity

I have an IBM DS3524 which looks to have free capacity which I'd like to either partially assign to two existing Volumes to extend them from 800 GB to 1TB. Or create a new Volume of 800 GB identical to the first two.
The DS3524 is reporting free capacity of 1,192.060 Gb but i was hoping to get some guidance on how much of this free space I can and should use and if extending the existing volumes might cause any problems.
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Mark RyanAsked:
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Andrew Hancock (VMware vExpert / EE MVE^2)Connect With a Mentor VMware and Virtualization ConsultantCommented:
Yes, oddly it does not appear there!

Select a Host > Configuration Tab > Storage

select the datastore > properties.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
If you are using VMware Sphere, once you have created the LUN on the RAID Array, you can increase the current datastore, and use this free space to expand your VMFS datastore.
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Mark RyanAuthor Commented:
I have VMWare vSphere Client 5 and can see the two existing 800 Gb Volumes. However capacity is set to 799.75 Gb on these. I've had a look on the vSphere client but I don't see anything which would allow me to grow the two existing Volumes. Can you point me in the right direction?
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Right Click Datastore and select Properties, and select Increase
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Mark RyanAuthor Commented:
I tried going into Datastores and Datastore Clusters on the vSphere Client selecting one of the Datastores, but I'm not presented with a Properties option when I right click this. Am I in the wrong place? Can you clarify where this should be done from? Please see screenshot attached
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Mark RyanAuthor Commented:
Hi Andrew,

Thank you for that. I found the Increase button you directed me to. Unfortunately the Increase Datastore Capacity window doesn't give me a selection. The window is blank. Please see Screenshot attached. I've tried a number of the options on this window but nothing changes anything. Can you confirm that I should be seeing something on this window. Or suggest what I might be doing wrong.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
How have you installed ESXi, is it on the same RAID array as the datastore you wish to expand?
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Mark RyanAuthor Commented:
Yea we have two hosts running ESXi 5. However ESXi is installed on an internal USB key on the motherboard of each host, so it's not installed on the Raid array or the Shared disk storage.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
Did you increase the array size, and the logical disk size in the Array?
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Mark RyanAuthor Commented:
Hi, My apologies I have not come back sooner about this. I went ahead and created a new  800Gb Logical Drive and mapped it to the VMWare Hosts. This allowed me to do what I needed. I moved our Backup VM to this new Logical Drive and it freed up a sizeable amount of space on the other drives.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
No problems.
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Mark RyanAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for MarkIT's comment #a39836099

for the following reason:

I had to resolve this issue myself. The assistance did help, but didn't assist greatly with the tasks i undertook to resolve my issue.
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
OBJECTION!:- If the Assistance Helped you please Assign Points.
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