Hello people ! I have an x86 SLES 10 system that is connected to some disks on two EnterpriseStorageSystems (ESS) via two QLogic FibreChannel SCSI Adapters. Each adapter has one path to each disk, so I have a real multipathing environment. Now, I have the need to re-configure the available disks during the system is up and running. Up to now (and hopefully in future also), the only kind of re-configuration is to add more disks. To be more exact, the system is started wth only the disks of ESS 1 connected, and the disks on ESS 2 need to be added later on. The disk layouts on both ESS's are identical. To make the new disks known to the system, I followed these instructions: http://www-941.ibm.com/collaboration/wiki/display/LinuxP/SCSI+-+Hot+add,+remove,+rescan+of+SCSI+devices And this is the script I have created, acording to the above mentioned instructions: for HOST in /sys/class/scsi_host/host? do echo "- - -" > $HOST/scan done When I run this script, all new disks except one are detected. All new disks (except the missing one of course) are found by both pathes. In the syslog, there are many messages about the disks that were found, but none (not even error messages) about the disk that was not found. When I then rebot the system, all disks are there, including the one that was not found by the rescan. Therefore I think my configuration is OK. The missing disk is always the first one (LUN 000). I have tested this by changing the order of the disks on ESS 2. I have also repeated the test scenario with only one path per disk. In this testcase, I have divided the ESS's on the two Adapters (Adapter 1 accesses the disks on ESS 1, Adapter 2 those on ESS 2). Sadly, with no change in the result. I think the first thing I would need help with is how to further analyze the problem. Thanks and Regards, Markus - To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
