Veeam Support Knowledge Base
Slow backup perfomance in HOTADD (virtual appliance) mode

Slow backup perfomance in HOTADD (virtual appliance) mode

KB ID:	1739
Product:	Veeam Backup & Replication
Published:	2013-03-07
Last Modified:	2025-04-23

Cheers for trusting us with the spot in your mailbox!

Now you’re less likely to miss what’s been brewing in our knowledge base with this weekly digest

Oops! Something went wrong.

Please, try again later.

Edge Case Issue

The issue documented in this article is highly uncommon and is directly related to storage and network congestion. For more information, closely review the Broadcom KB Article 1002598.

As this is an issue between the vSphere environment and the backend datastore storage, this article is Veeam Backup & Replication version agnostic.

Challenge

In some cases, depending on infrastructure setup and iSCSI storage, you can experience an issue when HOTADD mode performs slower than NBD(network) mode.

Cause

Some iSCSI storage arrays from different array vendors do not behave appropriately during periods of network congestion. This problem is related to the TCP/IP implementation of these arrays and can severely impact the read performance of storage attached to the ESXi/ESX software through the iSCSI initiator. The problem has also been reported in native (non-virtualized) environments involving the Microsoft iSCSI initiator.

Solution

Broadcom KB1002598: ESX/ESXi hosts might experience read or write performance issues with certain iSCSI storage arrays

To submit feedback regarding this article, please click this link: Send Article Feedback
To report a typo on this page, highlight the typo with your mouse and press CTRL + Enter.

Spelling error in text

Thank you!

Your feedback has been received and will be reviewed.

Oops! Something went wrong.

Please, try again later.

You have selected too large block!

Please try select less.

KB Feedback/Suggestion

This form is only for KB Feedback/Suggestions, if you need help with the software open a support case

Product

Topic

Description

By submitting, you are agreeing to have your personal information managed in accordance with the terms of Veeam's Privacy Notice.

Verify your email to continue your product download

We've sent a verification code to:

An email with a verification code was just sent to

Didn't receive the code? Click to resend in sec

Didn't receive the code? Click to resend

Thank you!

Your feedback has been received and will be reviewed.

Oops! Something went wrong.

Please, try again later.