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Vmware  disk expand and create new disk question

Posted on 2012-12-20
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Last Modified: 2012-12-22
I have a linux box running of vmware and I have added 100GB as third drive, added to volume group and extended the volume,  but is there any  performance difference by  expanding the disk  instead of creating new disk?
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Question by:mokkan
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by:coolsport00
coolsport00 earned 200 total points
ID: 38710795
No..none. Assuming this is a 'data volume' & not a system volume, and assuming your "linux" OS version supports it, it is recommended to use a pvscsi scsi controller driver for data disks (not system disks) for better performance. But, using that controller type is also only recommended if you have IOPS > 2000 over that disk.

Regards.
~coolsport00
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by:traoher
traoher earned 200 total points
ID: 38710801
If you are using a SAN as your storage, the answer is no.  It is still straight IOPs back to the SAN.  However, you might want to consider a different block size for performance vs waste of padded space.
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by:Andrew Hancock (VMware vExpert / EE MVE)
Andrew Hancock (VMware vExpert / EE MVE) earned 100 total points
ID: 38710822
No, but it's not recommended, because you will create two snapshots per parent disk, which can cause you issues in the future.
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by:mokkan
ID: 38710827
Thank you very much. Yes, disk from SAN. Is there any performance in OS? Does system need more cpu cycle, if we add as a second disk instead on increasing?
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by:coolsport00
coolsport00 earned 200 total points
ID: 38710833
There is no perf degradation; no added vCPUs are needed.
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traoher earned 200 total points
ID: 38710861
Nope, as long as you can extend, you are good.  FYI, you cannot have any snapshot if you choose to extend the vmdk.
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by:mokkan
ID: 38716310
I've requested that this question be closed as follows:

Accepted answer: 125 points for traoher's comment #a38710861
Assisted answer: 125 points for coolsport00's comment #a38710795
Assisted answer: 125 points for traoher's comment #a38710801
Assisted answer: 0 points for mokkan's comment #a38710827
Assisted answer: 125 points for coolsport00's comment #a38710833

for the following reason:

thank you all of you guys.
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by:mokkan
ID: 38716311
Thank you all of you guys. Great information.
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Control application downtime with dependency maps

Visualize the interdependencies between application components better with Applications Manager's automated application discovery and dependency mapping feature. Resolve performance issues faster by quickly isolating problematic components.

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