On 12/19/2016 12:50 PM, Muneendra Kumar M wrote: > Customers using Linux host (mostly RHEL host) using a SAN network for > block storage, complain the Linux multipath stack is not resilient to > handle non-deterministic storage network behaviors. This has caused many > customer move away to non-linux based servers. The intent of the below > patch and the prevailing issues are given below. With the below design > we are seeing the Linux multipath stack becoming resilient to such > network issues. We hope by getting this patch accepted will help in more > Linux server adoption that use SAN network. > > I have already sent the design details to the community in a different > mail chain and the details are available in the below link. > > https://www.redhat.com/archives/dm-devel/2016-December/msg00122.html. > > Can you please go through the design and send the comments to us. > This issue is coming up from time to time. Standard answer here is that using 'service-time' as a path selector _should_ already give you the expected results; namely any path exhibiting intermediate I/O errors should have a higher latency than any functional path. Hence the 'service-time' path selector should switch away from those paths automatically. Have you tried this? Cheers, Hannes -- Dr. Hannes Reinecke Teamlead Storage & Networking 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
