Discussions specific to the VMware vSphere hypervisor
Post Reply
readie
Expert
Posts: 158
Liked: 30 times
Joined: Dec 05, 2010 9:29 am
Full Name: Bob Eadie
Contact:

Why does HotAdd mode use network?

Post by readie » Dec 04, 2013 12:05 pm

I am investigating some performance issues, and am puzzled by this. When I look at the Bottleneck figures, I am getting
Source 0%
Proxy 21%
Network 94%
Target 99%

I was expecting the Target to be the bottleneck (it's the target iSCSI SAN which is the focus of my investigation at the moment) but in HotAdd mode, why is there any network figure at all? My understanding was that both the source VHD and the target replica VHD are connecting directly to the Veeam Server as VHDs. I can see this happening in VSphere. So what traffic is going over the network?
Does this figure actually refer to the iSCSI network, or what? Looking at the figures (we are getting pathetic 6MB/s at the moment, but we are pretty certain that is down to the change to a different iSCSI SAN) I find it difficult to believe that any network component is running at 94%, even though we are using only 1GB (not10 - yet!).
Thanks for any clues, or explanation to improve my understanding.
Bob
Bob Eadie
Computer Manager at Bedford School, UK (since 1999).
Veeam user since 2009.

foggy
Veeam Software
Posts: 17712
Liked: 1481 times
Joined: Jul 11, 2011 10:22 am
Full Name: Alexander Fogelson
Contact:

Re: Why does HotAdd mode use network?

Post by foggy » Dec 04, 2013 2:06 pm

During replication, data read from the source datastore and processed by the source proxy is then transferred to the target proxy to be written to the target datastore. "Network" here refers to the connection between source and target proxy servers. Since (as I can get from your post) you have both source and target proxies deployed on the same server (Veeam B&R console), I would not pay much attention to the value shown for it. The main goal of the bottleneck analysis is to show the weakest point in the chain and in your case it is clearly the write speed to target storage.

readie
Expert
Posts: 158
Liked: 30 times
Joined: Dec 05, 2010 9:29 am
Full Name: Bob Eadie
Contact:

Re: Why does HotAdd mode use network?

Post by readie » Dec 06, 2013 3:11 pm

Thanks. That's clarified.
Bob Eadie
Computer Manager at Bedford School, UK (since 1999).
Veeam user since 2009.

Post Reply

Who is online

Users browsing this forum: Exabot [Bot] and 17 guests