https://community.hpe.com/t5/msa-storage/msa-1500cs/m-p/1065930#M4668 Assuming all your connected hosts are DUAL HBA connected...and as long as you are not running MSA fw v7. or higher.<BR />Your hosts should all be receiving I/0 via the active controller. <BR />One way to check this is to logon to fabric switches using a cli tool like Putty and run a 'perfportshow' command to determine whether any I/0 traffic is going down the passive controller path, and on the host ports. If no I/0 then it should be fine to reseat the passive controller. Fri, 13 Mar 2009 12:07:30 GMT James Muell 2009-03-13T12:07:30Z https://community.hpe.com/t5/msa-storage/msa-1500cs/m-p/1065929#M4667 We have an Active/Passive controller setup and the passive controller has gone down with an error 204, the HP tech. told me to reseat the controller to clear the fault. since I have not done this with such an old SAN is there any gotchas that I need to watch out for? anything out of the ordinary with this SAN that could lead to data loss when the controller comes back on line after it is reseated?<BR /> <BR /> Thanks Thu, 12 Mar 2009 18:40:55 GMT https://community.hpe.com/t5/msa-storage/msa-1500cs/m-p/1065929#M4667 paul spolidoro 2009-03-12T18:40:55Z https://community.hpe.com/t5/msa-storage/msa-1500cs/m-p/1065930#M4668 Assuming all your connected hosts are DUAL HBA connected...and as long as you are not running MSA fw v7. or higher.<BR />Your hosts should all be receiving I/0 via the active controller. <BR />One way to check this is to logon to fabric switches using a cli tool like Putty and run a 'perfportshow' command to determine whether any I/0 traffic is going down the passive controller path, and on the host ports. If no I/0 then it should be fine to reseat the passive controller. Fri, 13 Mar 2009 12:07:30 GMT https://community.hpe.com/t5/msa-storage/msa-1500cs/m-p/1065930#M4668 James Muell 2009-03-13T12:07:30Z