* Chandra Seetharaman > Do you see multiple failures like shown below during the device probe > time ? Yes, on all paths to the passive controller I get numerous I/O errors, which happens when the kernel attempts to read in the partition table, when LVM wants to look for PV signatures, and so on. This is the behaviour I expect when using RDAC mode. > Hmm. In my storage it is enabled. That is why I do not see that issue. > May be multipath tools should read and ignore the stderr. If AVT is enabled in your storage, you shouldn't need the RDAC hardware handler. When dm-multipath switches pg and starts sending I/O to the passive paths they should go live automatically, at least they do so for me... Bad thing about AVT is of course that when node X in a cluster boots, the partition table scanning will transfer the volume, making the active controller that e.g. nodes Y and Z was using heavily go passive, disrupting I/O and making everything wobbly until node X has finished its bootup procedure. Regards -- Tore Anderson -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
