Re: [ovirt-devel] [vdsm] Wrong default multipath configuration for EL6

From: "Patrick Hurrelmann" <patrick.hurrelmann(a)lobster.de&gt; To: vdsm-devel(a)lists.fedorahosted.org, devel(a)ovirt.org Sent: Tuesday, July 29, 2014 4:43:36 PM Subject: [vdsm] Wrong default multipath configuration for EL6 Hi all, after suffering from boot-failures after kernel-updates on my EL6 hosts (the ones that san boot via iscsi), I finally managed to locate the root cause of the problem: the default values as set by vdsm are incorrect for EL6 and prohibit a successful iscsi boot (the faulty multipath.conf gets embedded in the new initrd on a kernel update). Additionally the following errors are repeatedly logged on all my hosts (device ids may vary) with the default vdsm multipath config: device-mapper: table: 253:5: multipath: error getting device device-mapper: ioctl: error adding target to table device-mapper: table: 253:5: multipath: error getting device device-mapper: ioctl: error adding target to table And it all boils down to the default value set for option getuid_callout in multipath.conf. Vdsm sets it to the following: getuid_callout "/sbin/scsi_id --whitelisted --replace-whitespace --device=/dev/%n" According to the man-page and other docu the default value on EL6 is "/lib/udev/scsi_id --whitelisted --device=/dev/%n". Although the binary /sbin/scsi_id is a valid link to the target /lib/udev/scsi_id, the link itself (/sbin/scsi_id) is _not_ included in the generated initrd. The binary /lib/udev/scsi_id is indeed included and changing the default config to use /lib/udev/scsi_id instead does make it all work again. iscsi boot (after regenerating the initrd, as the multipath.conf is embedded) is back to good and the previously logged device-mapper errors are gone, too. Can someone please verify this and and apply the easy (attached) patch?

--- multipath.py.orig 2014-07-29 15:24:37.643839169 +0200 +++ multipath.py 2014-07-29 15:25:06.823840362 +0200 @@ -88,9 +88,8 @@ log = logging.getLogger("Storage.Multipath") _scsi_id = utils.CommandPath("scsi_id", - "/sbin/scsi_id", # EL6 "/usr/lib/udev/scsi_id", # Fedora - "/lib/udev/scsi_id", # Ubuntu + "/lib/udev/scsi_id", # EL6, Ubuntu ) Thanks a lot and best regards Patrick -- Lobster SCM GmbH, Münchner Straße 15a, D-82319 Starnberg HRB 178831, Amtsgericht München Geschäftsführer: Dr. Martin Fischer, Rolf Henrich _______________________________________________ vdsm-devel mailing list vdsm-devel(a)lists.fedorahosted.org https://lists.fedorahosted.org/mailman/listinfo/vdsm-devel