topic how to size bandwidth required for snapmirror? in ONTAP Discussions https://community.netapp.com/t5/ONTAP-Discussions/how-to-size-bandwidth-required-for-snapmirror/m-p/51549#M12112 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>I don't think you can easily collect any hard numbers re block-level changes from a Windows server. One method I can think of is to install OSSV agents on all Windows servers &amp; do OSSV backups to a NetApp filer.</P><P></P><P>Other than that, you are left with rules of thumbs, estimations &amp; dark art <SPAN __jive_emoticon_name="wink" __jive_macro_name="emoticon" class="jive_macro jive_emote" src="https://community.netapp.com/4.5.5/images/emoticons/wink.gif"></SPAN> :</P><P>- block-level changes are typically ~10x smaller than file-level changes</P><P>- block-level changes for file shares are typically &lt;1% per day</P><P>- block-level changes for databases could be 20% per day or more</P><P></P><P>Regards,</P><P>Radek</P></BODY></HTML> Mon, 24 Oct 2011 10:09:56 GMT radek_kubka 2011-10-24T10:09:56Z how to size bandwidth required for snapmirror? https://community.netapp.com/t5/ONTAP-Discussions/how-to-size-bandwidth-required-for-snapmirror/m-p/51544#M12110 <HTML><HEAD></HEAD><BODY><P>i have a few windows servers and i need it to know the block level changed on each server for the bandwidth required. may i know what counters i need to turn on inside windows perfmon?</P></BODY></HTML> Thu, 05 Jun 2025 06:43:03 GMT https://community.netapp.com/t5/ONTAP-Discussions/how-to-size-bandwidth-required-for-snapmirror/m-p/51544#M12110 danielang 2025-06-05T06:43:03Z how to size bandwidth required for snapmirror? https://community.netapp.com/t5/ONTAP-Discussions/how-to-size-bandwidth-required-for-snapmirror/m-p/51549#M12112 <HTML><HEAD></HEAD><BODY><P>Hi,</P><P></P><P>I don't think you can easily collect any hard numbers re block-level changes from a Windows server. One method I can think of is to install OSSV agents on all Windows servers &amp; do OSSV backups to a NetApp filer.</P><P></P><P>Other than that, you are left with rules of thumbs, estimations &amp; dark art <SPAN __jive_emoticon_name="wink" __jive_macro_name="emoticon" class="jive_macro jive_emote" src="https://community.netapp.com/4.5.5/images/emoticons/wink.gif"></SPAN> :</P><P>- block-level changes are typically ~10x smaller than file-level changes</P><P>- block-level changes for file shares are typically &lt;1% per day</P><P>- block-level changes for databases could be 20% per day or more</P><P></P><P>Regards,</P><P>Radek</P></BODY></HTML> Mon, 24 Oct 2011 10:09:56 GMT https://community.netapp.com/t5/ONTAP-Discussions/how-to-size-bandwidth-required-for-snapmirror/m-p/51549#M12112 radek_kubka 2011-10-24T10:09:56Z