On 29.07.2014 15:51, Nir Soffer wrote:
----- Original Message -----
From: "Patrick Hurrelmann" <patrick.hurrelmann@lobster.de> To: vdsm-devel@lists.fedorahosted.org, devel@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?
Thanks Patrick!
I'll look into this.
Would you open a bug for this issue, to help us track this issue?
BZ#1124450 created to track the issue. Thanks, Patrick -- Lobster SCM GmbH, Münchner Straße 15a, D-82319 Starnberg HRB 178831, Amtsgericht München Geschäftsführer: Dr. Martin Fischer, Rolf Henrich