Brijn
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Enthusiast

Slow SFTP transfer speeds TO esx, slightly better FROM esx. But

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Hello,

I'm trying to transfer VMDK's to an ESX host. Only one datastore on a local RAID aray. When I transfer data to a VM (residing in the same DS) I get 50MB/s. When transferring data to the esx host ik get around 2MB/s, read is around 3MB/s. I know SSH has some overhead, but not that much Smiley Wink

What could be the problem?

Bas

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Texiwill
Leadership
Leadership

Hello,

The SC throttles all writes to a VMFS to protect the running VMs from DIsk IO overloads. But it should not be that bad. I have seen some strange behavior with writing to datastores and doing too many actions at once, specifically vCenter actions and service console actions simultaneous... Both slow down considerably when you operate within the same data store.

Are you ONLY doing SFTP or something else on that same datastore?

BTW, I found that VMware Converter (standalone) is better for this type of thing... It works quite quickly.


Best regards,
Edward L. Haletky VMware Communities User Moderator, VMware vExpert 2009

Virtualization Practice Analyst[/url]
Now Available: 'VMware vSphere(TM) and Virtual Infrastructure Security'[/url]
Also available 'VMWare ESX Server in the Enterprise'[/url]
[url=http://www.astroarch.com/wiki/index.php/Blog_Roll]SearchVMware Pro[/url]|Blue Gears[/url]|Top Virtualization Security Links[/url]|
[url=http://www.astroarch.com/wiki/index.php/Virtualization_Security_Round_Table_Podcast]Virtualization Security Round Table Podcast[/url]

--
Edward L. Haletky
vExpert XIV: 2009-2022,
VMTN Community Moderator
vSphere Upgrade Saga: https://www.astroarch.com/blogs
GitHub Repo: https://github.com/Texiwill

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3 Replies
Texiwill
Leadership
Leadership

Hello,

The SC throttles all writes to a VMFS to protect the running VMs from DIsk IO overloads. But it should not be that bad. I have seen some strange behavior with writing to datastores and doing too many actions at once, specifically vCenter actions and service console actions simultaneous... Both slow down considerably when you operate within the same data store.

Are you ONLY doing SFTP or something else on that same datastore?

BTW, I found that VMware Converter (standalone) is better for this type of thing... It works quite quickly.


Best regards,
Edward L. Haletky VMware Communities User Moderator, VMware vExpert 2009

Virtualization Practice Analyst[/url]
Now Available: 'VMware vSphere(TM) and Virtual Infrastructure Security'[/url]
Also available 'VMWare ESX Server in the Enterprise'[/url]
[url=http://www.astroarch.com/wiki/index.php/Blog_Roll]SearchVMware Pro[/url]|Blue Gears[/url]|Top Virtualization Security Links[/url]|
[url=http://www.astroarch.com/wiki/index.php/Virtualization_Security_Round_Table_Podcast]Virtualization Security Round Table Podcast[/url]

--
Edward L. Haletky
vExpert XIV: 2009-2022,
VMTN Community Moderator
vSphere Upgrade Saga: https://www.astroarch.com/blogs
GitHub Repo: https://github.com/Texiwill
Brijn
Enthusiast
Enthusiast

Hi,

The machine is lightly loaded, so I don't think that should be an issue. Your converter tip however was golden! Just moved the same VM over with 60MB/sec avg transfer speed, NICE.

Bas

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stimulant
Contributor
Contributor

Excellent tip, saved me a TON of time. Thank you!

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