* Gerald Nowitzky > The mpath_prio_emc with group_by_prio did the trick. Thanks! > > But I am still loosing the paths to the failed devices. I Increased > dev_loss_tmo, but the maximum seems to be about 600 - thus, after 10 > Minutes, the paths fail: The maximum is indeed 600 seconds in 2.6.23. > SANfile_m linux # multipath -l > hcfshare (360060160c820080063502869e459dc11) dm-0 , > [size=3.4T][features=1 queue_if_no_path][hwhandler=1 emc] > \_ round-robin 0 [prio=0][enabled] > \_ #:#:#:# - #:# [failed][undef] > \_ #:#:#:# - #:# [failed][undef] > \_ round-robin 0 [prio=0][active] > \_ 2:0:0:0 sdd 8:48 [active][undef] > \_ 1:0:0:0 sdb 8:16 [active][undef] > If I put them online again, I run into the -EEXIST prob. Async SCSI > scanning *is* off in my kernel, so the only thing I could do from > here is to try the patch, is it? Matthew Wilcox' patch solved this particular problem for me, yes. I still had some problems with -EEXIST when unloading and re-inserting the HBA driver module, though, but that's a corner case I rarely run into (as well as being easily worked around by trying again). Come to think of it, you never said which kernel version you're running...? > Oct 17 17:26:36 SANfile_m kernel: kobject_add failed for 1:0:1:0 with > -EEXIST, don't try to register things with the same name in the same > directory. One suggestion... If the sysfs object is still around, you might be able to delete it manually by running «echo 1 > /sys/class/scsi_device/1:0:1:0/device/delete». If that works, you can try to rescan again by doing «echo 0 1 0 > /sys/class/scsi_host/host1/scan». With some luck it'll work... If it does, most of the time udev will notice and alert multipath to check out the new device. Sometimes it doesn't work, though - simply run the «multipath» command manually in that case. By the way - the «1» in «host1» maps to the first digit in «1:0:1:0», while the «0 1 0» in the echo command to the last three. Regards -- Tore Anderson -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
