topic Re: MPHA in ONTAP Discussions https://community.netapp.com/t5/ONTAP-Discussions/MPHA/m-p/63508#M14954 <HTML><HEAD></HEAD><BODY><P>Filer distributes active paths to disk across two available paths. For Fibre Channel this happens per disk; for SAS this happens per shelf (at least, that is what I have observed).</P><P></P><P>There is no absolute answer to any performance question. MP-HA distributes IO across more HBAs; OTOH now you have two controllers competing for the same FC loop. This is less relevant for SAS. But I am sure that you will be disk and/or CPU bound long before you will be HBA bound.</P></BODY></HTML> Thu, 13 Sep 2012 07:50:58 GMT aborzenkov 2012-09-13T07:50:58Z MPHA https://community.netapp.com/t5/ONTAP-Discussions/MPHA/m-p/63504#M14952 <HTML><HEAD></HEAD><BODY><P>Hi Frndz,</P><P></P><P>Does MPHA make any improvement in loop performance....?</P><P></P><P>Also ,does the redundant primary path is been used for data flow...?</P><P>Please clarify</P><P></P><P>Regards,<BR />saran</P></BODY></HTML> Thu, 05 Jun 2025 06:19:10 GMT https://community.netapp.com/t5/ONTAP-Discussions/MPHA/m-p/63504#M14952 saranraj456 2025-06-05T06:19:10Z Re: MPHA https://community.netapp.com/t5/ONTAP-Discussions/MPHA/m-p/63508#M14954 <HTML><HEAD></HEAD><BODY><P>Filer distributes active paths to disk across two available paths. For Fibre Channel this happens per disk; for SAS this happens per shelf (at least, that is what I have observed).</P><P></P><P>There is no absolute answer to any performance question. MP-HA distributes IO across more HBAs; OTOH now you have two controllers competing for the same FC loop. This is less relevant for SAS. But I am sure that you will be disk and/or CPU bound long before you will be HBA bound.</P></BODY></HTML> Thu, 13 Sep 2012 07:50:58 GMT https://community.netapp.com/t5/ONTAP-Discussions/MPHA/m-p/63508#M14954 aborzenkov 2012-09-13T07:50:58Z Re: MPHA https://community.netapp.com/t5/ONTAP-Discussions/MPHA/m-p/63515#M14957 <HTML><HEAD></HEAD><BODY><DIV><P>Even with 4gb fc we didn't see back end bottlenecks with 2x4gb paths to esh4... Now with with 3 and 6gb sas. 4 lanes of 3 or 6gb for 12gb or 24gb per path. Then multipath and have 24gb or 48gb to the stack. I haven't seen a case where the back end is a bottleneck.</P></DIV></BODY></HTML> Thu, 13 Sep 2012 11:42:14 GMT https://community.netapp.com/t5/ONTAP-Discussions/MPHA/m-p/63515#M14957 scottgelb 2012-09-13T11:42:14Z