An example may illustrate the question better: 1) I have 2 FC SCSI devices each with 2 paths. dm_multipath will thus create 2 dm devices. 2) I create another dm device using the "striped" target and the members are the 2 multipath devices. The failure scenario: 1) the paths to my FC SCSI devices fail (e.g. the FC switch may be powered down etc - it doesn't really matter as to the cause). 2) The SCSI disks will (eventually) be marked as failed/offline. 3) dm_multipath detects the failed paths and marks them as such. The problem: Other than the states in 2) and 3) above, there is no status information maintained for dm devices (at least none that I can find - hence this email). System information: RedHat X86_64 RHEL4 release (update 3) QLogic FC HBA Some configuration setup: Output from "multipath -l" mylun1 (3600a0b80001f4e5d00001c764517be04) [size=18 GB][features="1 queue_if_no_path"][hwhandler="0"] \_ round-robin 0 [active] \_ 1:0:1:2 sdg 8:96 [active][ready] \_ 2:0:1:2 sdo 8:224 [active][ready] mylun2 (3600a0b80001f4e5d00001c744517bdba) [size=18 GB][features="1 queue_if_no_path"][hwhandler="0"] \_ round-robin 0 [active] \_ 1:0:0:1 sdb 8:16 [active][ready] \_ 2:0:0:1 sdj 8:144 [active][ready] Output from "dmsetup table" mylun1: 0 533651456 multipath 1 queue_if_no_path 0 2 1 round-robin 0 2 1 8:128 1280 65:0 1280 round-robin 0 2 1 8:64 1280 8:192 1280 mylun2: 0 819350994 multipath 1 queue_if_no_path 0 2 1 round-robin 0 2 1 8:48 1280 8:176 1280 round-robin 0 2 1 8:112 1280 8:240 1280 myvol1: 0 41943040 striped 2 256 253:0 10486144 253:1 10486144 Pointers/help on this will be greatly appreciated. Thanks Mark -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
