On 04/19/2015 12:56 AM, Christophe Varoqui wrote: > About five years ago, we faced a somewhat simular issue with > Symmetrix arrays, where the replicated LU of a SRDF pair (R2) was > flagged read-only by the kernel upon discovery. Splitting the pair > with a symcli command made the LU read-write from the array > controller point of view, but the Linux kernel would not promote it > read-write dynamically. > > I don't know if the Symmetrix array also use a unit attention to > signal the change to the initiators. If it does, it might be worth > trying to address both the 3par peer persistance and the Symmetrix > SRDF situations. > > On the other hand, if the SRDF R2 rw promotion issue has been fixed > since, the patch might give guidance about where/how to plug the > 3par peer persistance ghost path rescans. > It's not only that; if you are faced with LUNs in standby even the kernel wouldn't detect them properly. I'm currently debugging this issue and will have an update soon(-ish). Cheers, Hannes -- Dr. Hannes Reinecke zSeries & Storage hare@xxxxxxx +49 911 74053 688 SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton HRB 21284 (AG Nürnberg) -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
