On Wed, 2009-03-18 at 15:57 -0700, Christopher Chen wrote: > Hello, running Centos 5.2 here-- > > The multipathd daemon is very unhappy with any arbritrary script I > provide for determining priorities. I see some fuzz in the syslog > about ramfs and static binaries. > > How do I use shell scripts or arbitrary programs for multipathd? I > compiled a simple program that spits out "1" and it seems to return > appropriately. > > Also, why does multipath -ll return the appropriate data, namely > prio=1 (when using my custom statically compiled callout) and > multipath -l always returns prio=0? Is this an indication of a broken > configuration or something else? > > Cheers > > cc > I had the exact same problem and someone kindly explained it on this list so thanks to them. If I understand it correctly, multipathd must be prepared to function if it loses access to disk. Therefore, it is designed to not read from disk but caches everything it needs in memory. Apparently, it can only cache binaries. To use a shell script, call it via the shell, i.e., rather than shell.script call sh shell.script. That worked perfectly fine for me. However, I do not know if multipathd actually caches shell.script or if it still must read it from disk when invoking sh and hence remains vulnerable to loss of disk access. Does anyone know? Thanks - John -- John A. Sullivan III Open Source Development Corporation +1 207-985-7880 jsullivan@xxxxxxxxxxxxxxxxxxx http://www.spiritualoutreach.com Making Christianity intelligible to secular society -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
