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Posted on 2011-09-22
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Last Modified: 2012-05-12
is there a utility that will tell if the drive is truly logical unit or part of a bigger unit.
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Question by:25112
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by:25112
ID: 36579930
i am asking in VM...

like is the drive VMFS or RDMs
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Accepted Solution

by:
Andrew Hancock (VMware vExpert / EE MVE^2) earned 2000 total points
ID: 36579957
Not really, the Virtual Machine Guest OS, see's the partition presented to it.

You could only guess by the size, because a VMDK (on VMFS)  is limited to 2Tb-512bytes!

If the OS partition is larger than 2Tb-512bytes, it's beyond what is supported on a VMDK (on VMFS)
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by:25112
ID: 36579959
for example, Speccy shows only C drive.. this is a virtual server, and I am interested in Drive D & E...
s.bmp
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by:25112
ID: 36579979
this is the siw tool
s.bmp
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by:25112
ID: 36580018
does this help to know? this is the HDSentinel tool.. they give info, but not specific VM terms.
s.bmp
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Author Comment

by:25112
ID: 36580026
>>the Virtual Machine Guest OS, see's the partition presented to it.

so the partition is C/D/E, right? but are they one big piece or 3 diff pieces? (in layman's terms) as you can see these are only few GBs, nothing close to TB..
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LVL 124
ID: 36580078
yes, the partitions are C, D and E, 14, 10, 50GB, on three physical disks.

The VM has no connectivity to the outside "world" datastore.

You would need to be on the Host, and the VM has no connectivity to the Host.
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Author Comment

by:25112
ID: 36580096
>>yes, the partitions are C, D and E, 14, 10, 50GB, on three physical disks.

are they truly 3 physical drives. . or one unit partitioned as 3 physical one.. is it possible to tell?

>>You would need to be on the Host,
The tools were run off the server through RDP.. is that what you mean?
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LVL 124
ID: 36580113
Check with Disk Management in Windows

that will confirm where the partitions are stored.
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Author Comment

by:25112
ID: 36580178
do you mean this one?
s.bmp
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LVL 124
ID: 36580201
thats, correct.

3 virtual disks.
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Author Comment

by:25112
ID: 36580222
in the properties i see
Location: Bus Number 0, TargetID 0, LUN 0
Location: Bus Number 0, TargetID 1, LUN 0
Location: Bus Number 0, TargetID 2, LUN 0
for the 3 drives.. does that tell anything?
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Author Comment

by:25112
ID: 36580231
>>on three physical disks.
>>3 virtual disks.

sorry I am not following..
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LVL 124
ID: 36580259
The Virtual Machine you are using is made of 3 Disks

Disk 0 Partition 1 NTFS Partition 14GB System
Disk 1 Partition 1 NTFS Partiton 10GB Logs
Disk 2 Partition 1 NTFS Partition 50GB Data

what else do you need to know?
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Author Comment

by:25112
ID: 36580287
could you help to me to confirm either way from the above info, if the 3 disks are the same disk - (VMFS), just partitioned into three, or they are truly 3 distinct disks? - (RDMs)

All 3 have LUN0, does that mean it is all same VMFS?

sorry If I am not understanding any of these concepts right
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LVL 124
ID: 36580341
What we know is there are 3 disks in use, these disks could be stored on VMFS datastore, or RAW SAN LUN (RDM).

There is no way to tell, I'm afraid.

The Virtual Machine cannot see outside of itself.

You would need to login to the HOST Server, which hosts the Virtualk Machine.

Do you have Access to the Host Server, which HOSTs the Virtual Machine?
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LVL 5

Author Comment

by:25112
ID: 36580377
got you.. now I understand what you mean by 'host'.. no, I do not have access to that server. if I could get access, where/how can I find that info.?

"
Location: Bus Number 0, TargetID 0, LUN 0
Location: Bus Number 0, TargetID 1, LUN 0
Location: Bus Number 0, TargetID 2, LUN 0
"
is not meaningful for what we need?
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LVL 124
ID: 36580463
We cannot tell from inside the VM.

It would be self evident, when looking on the host Storage, if the host was using VMFS datastores or RDMs, and within the VM settings, you would be able to tell.
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LVL 5

Author Comment

by:25112
ID: 36580553
OK- I see what you saying..

could you also tell what is the meaning for
"Location: Bus Number 0, TargetID 2, LUN 0"
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LVL 124
ID: 36580570
Bus No. 0
Target ID 2 - SCSI ID 2
LUN 0 - Logcal Unit 0
0
 
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Author Comment

by:25112
ID: 36580616
>>LUN 0 - Logcal Unit 0
in this case, all 3 drives had the same..

what if they 1/2/3 - does that mean 3 LUNs are carved? is that enough info to say that statement?
for example, in another server which is physical but uses SAN has it like

Location: Bus Number 0, TargetID 6, LUN 0
Location: Bus Number 0, TargetID 6, LUN 1
Location: Bus Number 0, TargetID 6, LUN 2..(goes upto 11 LUN)

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LVL 124
ID: 36580644
Please see here for definions of LUNs

http://en.wikipedia.org/wiki/Logical_Unit_Number


I believe the original question has been answered.

There is not utility that can detect if the disk is on VMFS or RDM.

If you are happy with the answer please assign points, we are now discussing another question. If you would like to discuss this further please post a related question and myself or other experts will be happy to assist.


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LVL 5

Author Comment

by:25112
ID: 36580699
you are 100% right on.. thanks muhc..
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LVL 124
ID: 36580706
No problems.
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