Hello Li Xiao Keng, On Tue, 2023-09-05 at 16:06 +0800, Li Xiao Keng wrote: > Hello: > Wmware has PDL test(https://kb.vmware.com/s/article/2004684). > Is there has same function in multipath-tools? If not, can the > same function be achieved? AFAICT, PDL is not a term from the SCSI specifications, it's a terminology that VMware uses for a certain set of sense codes and qualifiers, as summarized on the VMware KB page you referenced. The general concept of "PDL" doesn't exist in multipath-tools, or on Linux in general, to my knowledge. So the answer is "no". OTOH, both the kernel and multipath-tools do interpret the sense codes received from the devices and try to determine an optimal reaction on the host side. Fabric-level errors will often result in remote ports in offline state, which will be removed after a devloss timeout. As the SCSI device won't exist any more after that, this is roughly similar to "PDL". But I don't think we have this for SCSI sense codes. I had a quick glance at the code and we don't seem to treat the ASC/ASCQ 0x25/0x0 and 0x68/0x0 in a special way, neither in the kernel nor in multipath- tools. This means that the multipath-tools checker will treat such paths as DOWN and continue checking them until they are removed, which won't happen unless the bus is rescanned. Patches welcome ;-) Regards, Martin -- dm-devel mailing list dm-devel@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/dm-devel
