Le vendredi 10 novembre 2006 à 14:58 -0500, Edward Goggin a écrit : > Christophe, > > Here is my 2nd attempt at a patch which attempts to prevent an I/O hang > which can occur with host I/O to an inactive CLARiiON snapshot logical > unit. Hi Edward, I think the diff is line-wrapped. Would you care to resend it as an attachment, or unwrapped. > While the inactive snapshot LU is presented to a host, inquiry, > TUR, and read capacity commands succeed, but read and write commands are > failed. Complicating the matter is the fact that read/write to the > active paths fails with a particular sense code/asc/ascq combination > while read/write to the passive paths does not. > > Unlike the previous patch, I've tried to make this one CLARiiON > specific. Two exceptions though. First, I did keep the change to > libcheckers/readsector0.c to allow other checkers than readsector0 to > use sg_read(). Right. I'll merge this one first. Feel free to submit it as a seperate patch. > Second, I changed libmultipath/discovery.c to allow > pathinfo() to invoke the path priority callout function of a path with a > path state of PATH_DOWN since some paths (e.g., paths to inactive > snapshot LU on CLARiiON) may have their state set to PATH_DOWN for > reasons other than transport connectivity failure. Without the latter > change, it is possible to create a situation whereby there are paths of > different priorities in the same path group even though the path group > policy is priority based grouping. This is certainly the case for paths > to a multipath mapped device for an inactive snapshot CLARiiON LUs when > the paths change to a healthy state as soon as the snapshot is > activated. > Ok, RedHat people working on the HSG/HSV hardware support might want to test for regression with that part applied. I'll happily take reports as I no longer have access to such hardware. Now I still have to read through the clariion checker changes. Thanks, cvaroqui -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
