1-800-691-1991 | 9am - 8pm ET
EN

Slow restore performance in SAN mode

KB ID: 2052
Product: Veeam Backup & Replication
Version: 8.x
Published: 2015-07-08
Last Modified: 2020-08-13

Challenge

In some cases, depending on infrastructure setup you can observe poor processing rate when performing full VM restore in SAN mode. You can notice as well that Network mode is faster.

Cause

If you restore Thick Lazy Zero disk using SAN mode, overall restore performance can be affected because of round trips through the disk manager APIs, AllocateBlock and ClearLazyZero requests. The reason that NBD mode can work faster in comparison to SAN mode (when not using block-sized writes) is because the write is performed by the host which has inside knowledge about layout of the vmdk. This inside knowledge must be requested from the host when VDDK is doing direct writes to the LUN.

Solution

Use alternative transport mode: network, virtual appliance
You can also try to restore in SAN mode via standalone ESXi. In some cases you may see a higher processing rate

More information at kb.vmware.com/kb/1035096
 
KB ID: 2052
Product: Veeam Backup & Replication
Version: 8.x
Published: 2015-07-08
Last Modified: 2020-08-13

Couldn't find what you were looking for?

Below you can submit an idea for a new knowledge base article.
Report a typo on this page:

Please select a spelling error or a typo on this page with your mouse and press CTRL + Enter to report this mistake to us. Thank you!

Spelling error in text

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Your report was sent to the responsible team. Our representative will contact you by email you provided.

Oops! Something went wrong.

Please try again later.

KB Feedback/Suggestion

By submitting, you are agreeing to have your personal information managed in accordance with the terms of Veeam's Privacy Policy.
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Thank you for your interest in Veeam products!
We've sent a verification code to:
  • Incorrect verification code. Please try again.
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

ty icon

Thank you!

We have received your request and our team will reach out to you shortly.

OK

error icon

Oops! Something went wrong.

Please try again later.