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microkid
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ESXi disk performance, possibly capped?

I have this whitebox with ESXi. It has a Intel DG33TL mobo, 320GB SATA disk connected to the onboard ICH10 controller (which hold my VM's), and 3 1TB disks connected to a Dell Perc 5/i in raid-5 (This holds my data).

When I copy a 3GB ISO file from the raid set to the sata disk, the average disk transfer is 50MB/sec. This puzzles me, because the SATA disk can do 100MB/sec easy. When I start a second copy, the average disk transfer doubles to 100MB/sec.

So it seems ESXi is capping the disk transfer for some reason, because 2 copy jobs do fully utilize the max speed of the SATA disk. Even further, when I start a 3rd copy, disk transfer increases to approx 113MB/sec (which is the limit of the disk, I think).

So, why do I not get the full disk transfer speed when only copying 1 file? I would expect 100MB/sec or so for 1 filecopy, and when 2 files are copied, 50MB/sec each (distributing the available transfer speed over multiple jobs).

Any ideas?

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maishsk
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File transfer speeds are capped in the console so you will not be able to get maximum speeds


Virtualization Architect & Systems Administrator

Maish Saidel-Keesing • @maishsk • http://technodrone.blogspot.com • VMTN Moderator • vExpert • Co-author of VMware vSphere Design

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maishsk
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File transfer speeds are capped in the console so you will not be able to get maximum speeds


Virtualization Architect & Systems Administrator

Maish Saidel-Keesing • @maishsk • http://technodrone.blogspot.com • VMTN Moderator • vExpert • Co-author of VMware vSphere Design
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microkid
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Aha! Is there a way to "uncap" this?

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maishsk
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Not that I know of

Maish

Virtualization Architect & Systems Administrator

Maish Saidel-Keesing • @maishsk • http://technodrone.blogspot.com • VMTN Moderator • vExpert • Co-author of VMware vSphere Design
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devzero
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i`d open a SR for this.

also have a look at http://communities.vmware.com/message/1284934

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