Usally less than 1 second, at least a couple of times during the snapmirror job

It is a Volume snapmirror

Ontap 7.1

-----Original Message----- From: Glenn Walker [mailto:ggwalker@mindspring.com] Sent: 14 November 2006 13:32 To: Davies,Matt; toasters@mathworks.com Subject: RE: SnapMirror Bandwidth restrictions

Hmm - I honestly have never noticed that problem on any of our equipment...

How long does the spike last? What version of ONTAP? VSM or QSM?

Glenn

-----Original Message----- From: Davies,Matt [mailto:MDAVIES@generalatlantic.com] Sent: Tuesday, November 14, 2006 7:58 AM To: Glenn Walker; toasters@mathworks.com Subject: RE: SnapMirror Bandwidth restrictions

Glenn,

The snapmirror.conf file is showing 1000 as the limit. Which should equate to just under 8Mb/s

Overall the rate does average out for the snapmirror jobs to be below 1000KB/s

There was only one snapmirror running at the time of the test I carried out to confirm the rates.

Matt

-----Original Message----- From: Glenn Walker [mailto:ggwalker@mindspring.com] Sent: 14 November 2006 12:47 To: Davies,Matt; toasters@mathworks.com Subject: RE: SnapMirror Bandwidth restrictions

I assume that the snapmirror.conf file is showing 1000 as the limit? This is in KB (kilobyte), not kb(kilobit).

Are you sure that there aren't multiple mirrors running simultaneously?

Glenn

-----Original Message----- From: owner-toasters@mathworks.com [mailto:owner-toasters@mathworks.com] On Behalf Of Davies,Matt Sent: Tuesday, November 14, 2006 5:40 AM To: toasters@mathworks.com Subject: SnapMirror Bandwidth restrictions

Hi,

We have noticed that when a snapmirror runs between our filers with a maximum transfer rate of 1000 KB/s, we are seeing peaks of traffic of around 24Mb/s.

This has been confirmed using ethereal, that it is the snapmirror traffic.

We have noticed that these peaks are causing excessive amount of dropped packets on the wan interface of the routers between all the site. we have tried a number of difference queuing strategies and bandwidth shaping, but the router cannot buffer all the packets during the peaks and starts dropping them. As we also use these links for both voice and video, we are seeing high jitter rates during these peaks, and need to do something about it.

We have a mixture of FAS250's and FAS270's all are showing the same problem

Has anyone else experienced this ? Or does anyone have any ideas.

Cheers

Matt