Hi, is there a document describing inner works of DM multipath target? I did some testing and found out that detecting redundant paths works just like it should (kudos for christophe), load-balancing too, but detecting failed path, for some reason, does not (or perhaps it is, but too late). I'm using GFS on top of multipathed virtual disk, and it seems that DM's timeout is a bit larger than GFS's. Shutting down one port on FC switch (thus, disabling at least one path) causes GFS to freeze and then hang with kernel panic (reporting that /dev/sda had physical errors - if you want, I could post logs). Skimming through code, I've found that DM will declare some path as unusable after some error count / rate. Is this true and where is it defined exacly? Can someone point me to the right direction so I could tweak DM a bit? -- Lazar Obradovic, System Engineer ----- laza@xxxxxx YUnet International http://www.EUnet.yu Dubrovacka 35/III, 11000 Belgrade Tel: +381 11 3119901; Fax: +381 11 3119901 ----- This e-mail is confidential and intended only for the recipient. Unauthorized distribution, modification or disclosure of its contents is prohibited. If you have received this e-mail in error, please notify the sender by telephone +381 11 3119901. -----