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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^2)
Andrew Hancock (VMware vExpert / EE MVE^2) 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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