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Description of problem: /etc/udev/rules.d/50-udev.rules was updated during the rollup to EL5.6, adding a tape/by-path tree We have 2 FC interfaces on one machine, looking at 7 FC tape drives (2 paths - 14 devices detected) /dev/tape/by-path is picking up all 7 drives (14 devices), however /dev/tape/by-id has started consistently missing one of them. # ls -l /dev/tape/by-path/ total 0 lrwxrwxrwx 1 root root 10 Jan 25 11:26 pci-0000:86:00.0-fc-0x500110a0013132b4:0x0000000000000000-nst-nst -> ../../nst0 lrwxrwxrwx 1 root root 9 Jan 25 11:26 pci-0000:86:00.0-fc-0x500110a0013132b4:0x0000000000000000-st -> ../../st0 lrwxrwxrwx 1 root root 11 Jan 25 11:26 pci-0000:86:00.0-fc-0x500110a001313fec:0x0000000000000000-nst-nst -> ../../nst11 lrwxrwxrwx 1 root root 10 Jan 25 11:26 pci-0000:86:00.0-fc-0x500110a001313fec:0x0000000000000000-st -> ../../st11 lrwxrwxrwx 1 root root 10 Jan 25 11:26 pci-0000:86:00.0-fc-0x500110a0013141a8:0x0000000000000000-nst-nst -> ../../nst8 lrwxrwxrwx 1 root root 9 Jan 25 11:26 pci-0000:86:00.0-fc-0x500110a0013141a8:0x0000000000000000-st -> ../../st8 lrwxrwxrwx 1 root root 10 Jan 25 11:26 pci-0000:86:00.0-fc-0x500110a00131426c:0x0000000000000000-nst-nst -> ../../nst9 lrwxrwxrwx 1 root root 9 Jan 25 11:26 pci-0000:86:00.0-fc-0x500110a00131426c:0x0000000000000000-st -> ../../st9 lrwxrwxrwx 1 root root 11 Jan 25 11:26 pci-0000:86:00.0-fc-0x500110a0013144e0:0x0000000000000000-nst-nst -> ../../nst10 lrwxrwxrwx 1 root root 10 Jan 25 11:26 pci-0000:86:00.0-fc-0x500110a0013144e0:0x0000000000000000-st -> ../../st10 lrwxrwxrwx 1 root root 10 Jan 25 11:26 pci-0000:86:00.0-fc-0x500110a001314b10:0x0000000000000000-nst-nst -> ../../nst1 lrwxrwxrwx 1 root root 9 Jan 25 11:26 pci-0000:86:00.0-fc-0x500110a001314b10:0x0000000000000000-st -> ../../st1 lrwxrwxrwx 1 root root 11 Jan 25 11:26 pci-0000:86:00.0-fc-0x500110a001314b48:0x0000000000000000-nst-nst -> ../../nst12 lrwxrwxrwx 1 root root 10 Jan 25 11:26 pci-0000:86:00.0-fc-0x500110a001314b48:0x0000000000000000-st -> ../../st12 lrwxrwxrwx 1 root root 10 Jan 25 11:26 pci-0000:86:00.1-fc-0x500110a0013132b4:0x0000000000000000-nst-nst -> ../../nst6 lrwxrwxrwx 1 root root 9 Jan 25 11:26 pci-0000:86:00.1-fc-0x500110a0013132b4:0x0000000000000000-st -> ../../st6 lrwxrwxrwx 1 root root 10 Jan 25 11:26 pci-0000:86:00.1-fc-0x500110a001313fec:0x0000000000000000-nst-nst -> ../../nst4 lrwxrwxrwx 1 root root 9 Jan 25 11:26 pci-0000:86:00.1-fc-0x500110a001313fec:0x0000000000000000-st -> ../../st4 lrwxrwxrwx 1 root root 11 Jan 25 11:26 pci-0000:86:00.1-fc-0x500110a0013141a8:0x0000000000000000-nst-nst -> ../../nst13 lrwxrwxrwx 1 root root 10 Jan 25 11:26 pci-0000:86:00.1-fc-0x500110a0013141a8:0x0000000000000000-st -> ../../st13 lrwxrwxrwx 1 root root 10 Jan 25 11:26 pci-0000:86:00.1-fc-0x500110a00131426c:0x0000000000000000-nst-nst -> ../../nst2 lrwxrwxrwx 1 root root 9 Jan 25 11:26 pci-0000:86:00.1-fc-0x500110a00131426c:0x0000000000000000-st -> ../../st2 lrwxrwxrwx 1 root root 10 Jan 25 11:26 pci-0000:86:00.1-fc-0x500110a0013144e0:0x0000000000000000-nst-nst -> ../../nst3 lrwxrwxrwx 1 root root 9 Jan 25 11:26 pci-0000:86:00.1-fc-0x500110a0013144e0:0x0000000000000000-st -> ../../st3 lrwxrwxrwx 1 root root 10 Jan 25 11:26 pci-0000:86:00.1-fc-0x500110a001314b10:0x0000000000000000-nst-nst -> ../../nst7 lrwxrwxrwx 1 root root 9 Jan 25 11:26 pci-0000:86:00.1-fc-0x500110a001314b10:0x0000000000000000-st -> ../../st7 lrwxrwxrwx 1 root root 10 Jan 25 11:26 pci-0000:86:00.1-fc-0x500110a001314b48:0x0000000000000000-nst-nst -> ../../nst5 lrwxrwxrwx 1 root root 9 Jan 25 11:26 pci-0000:86:00.1-fc-0x500110a001314b48:0x0000000000000000-st -> ../../st5 # ls -l /dev/tape/by-id/ total 0 lrwxrwxrwx 1 root root 10 Jan 25 11:26 scsi-200900d0710200002 -> ../../sg42 lrwxrwxrwx 1 root root 10 Jan 25 11:26 scsi-3500110a0013132b6 -> ../../nst6 lrwxrwxrwx 1 root root 11 Jan 25 11:26 scsi-3500110a0013141aa -> ../../nst13 lrwxrwxrwx 1 root root 10 Jan 25 11:26 scsi-3500110a00131426e -> ../../nst9 lrwxrwxrwx 1 root root 11 Jan 25 11:26 scsi-3500110a0013144e2 -> ../../nst10 lrwxrwxrwx 1 root root 10 Jan 25 11:26 scsi-3500110a001314b12 -> ../../nst7 lrwxrwxrwx 1 root root 11 Jan 25 11:26 scsi-3500110a001314b4a -> ../../nst12 As we rely on /dev/tape/by-id/* for backups in order to avoid fc path changes messing up drive references, the change has introduced a regression for us and needs to be fixed fairly quickly. Version-Release number of selected component (if applicable): RHEL 5 U 6 How reproducible: consistent.. customer has fixed issue with the 50-udev.rules and I will be attaching file asap. Customer would like this to be fixed as soon as possible in the release cycle.
Created attachment 486896 [details] diff of dev rules showing propsed change
More Information on What Was Wrong.. The script had been messed up and was looking for /dev/(n)st[0-9]* instead of /dev/(n)st*[0-9] - a subtle but important difference (note the position of the wildcard...) The following diff against udev-095-14.24.el5, in order of changes: 1: fixes the /dev/tape/by-id wildcard placements and correctly places *-st + *-nst entries. 2: fixes bogus "*-nst-nst" entries in /dev/tape/by-path 3: Correctly identifies changers in /dev/tape/by-id 4: adds *-sg entries for tape devices into /dev/tape/by-id This is critical for utilities such as smartctl and tapeinfo in order to get drive status while there is a scsi reservation on the character device. In particular the Bacula package requires this to avoid having to jump through hoops every time a job completes.
Reassigned..
(In reply to comment #1) > Created attachment 486896 [details] > diff of dev rules showing propsed change oh my... an .rtf document of a diff :)
It wasn't an rtf when I submitted it :)
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHBA-2011-1046.html