Issue with setting uid/gid/mode in multipath.conf

Issue with setting uid/gid/mode in multipath.conf

[Chandra Seetharaman]

Hi Benjamin,

I have a small issue with setting the uid/gid/mode with multipath tools.

I have the following in my /etc/mulitpath.conf file
------------------
multipaths {
        multipath {
                wwid 3600a0b800011a1ee00003f834a3f7a65
                alias dev4
                mode    0666
                uid     1001
                gid     1001
        }
}
-------------------

After adding this, I do a "multipath -F" following by "multipath" (or
multipath -F followed by /etc/init.d/multipathd restart), I see the
attributes are set properly on the device.

I reboot the system, the device is created (under /dev/mapper) but
attributes are not set as defined in the multipath.conf file.

Have you seen this issue ? 

I am using RHEL 5.3 ga version (kernel and tools).

I am not booting from a multipath device (IOW, there is no
multipath.conf in initrd).

Thanks,

chandra

Re: Issue with setting uid/gid/mode in multipath.conf

[Mark Goodwin]

Chandra Seetharaman wrote:
> Hi Benjamin,
> 
> I have a small issue with setting the uid/gid/mode with multipath tools.
> 
> I have the following in my /etc/mulitpath.conf file
> ------------------
> multipaths {
>         multipath {
>                 wwid 3600a0b800011a1ee00003f834a3f7a65
>                 alias dev4
>                 mode    0666
>                 uid     1001
>                 gid     1001
>         }
> }
> -------------------
> 
> After adding this, I do a "multipath -F" following by "multipath" (or
> multipath -F followed by /etc/init.d/multipathd restart), I see the
> attributes are set properly on the device.
> 
> I reboot the system, the device is created (under /dev/mapper) but
> attributes are not set as defined in the multipath.conf file.
> 
> Have you seen this issue ? 
> 
> I am using RHEL 5.3 ga version (kernel and tools).
> 

yes we've recently also seen this issue and can reproduce it without
any need for a reboot, see https://bugzilla.redhat.com/518575

It seems to be a racy interaction of some kind between udevd and multipathd.

Cheers
-- Mark

Re: Issue with setting uid/gid/mode in multipath.conf

[Bryn M. Reeves]

On Thu, 2009-08-20 at 12:25 -0700, Chandra Seetharaman wrote:
> After adding this, I do a "multipath -F" following by "multipath" (or
> multipath -F followed by /etc/init.d/multipathd restart), I see the
> attributes are set properly on the device.
> 
> I reboot the system, the device is created (under /dev/mapper) but
> attributes are not set as defined in the multipath.conf file.
> 
> Have you seen this issue ? 
> 
> I am using RHEL 5.3 ga version (kernel and tools).
> 
> I am not booting from a multipath device (IOW, there is no
> multipath.conf in initrd).

Hi Chandra,

I've seen problems with this as well. In my testing the setting of the
UID/GID is unreliable - in around one of five runs the uid/gid take the
default instead of the configured value.

I'm intending to open a Red Hat BZ for this problem today.

Regards,
Bryn.

Re: Issue with setting uid/gid/mode in multipath.conf

[Bryn M. Reeves]

On Fri, 2009-08-21 at 10:14 +0100, Bryn M. Reeves wrote:
> On Thu, 2009-08-20 at 12:25 -0700, Chandra Seetharaman wrote:
> > After adding this, I do a "multipath -F" following by "multipath" (or
> > multipath -F followed by /etc/init.d/multipathd restart), I see the
> > attributes are set properly on the device.
> > 
> > I reboot the system, the device is created (under /dev/mapper) but
> > attributes are not set as defined in the multipath.conf file.
> > 
> > Have you seen this issue ? 
> > 
> > I am using RHEL 5.3 ga version (kernel and tools).
> > 
> > I am not booting from a multipath device (IOW, there is no
> > multipath.conf in initrd).
> 
> Hi Chandra,
> 
> I've seen problems with this as well. In my testing the setting of the
> UID/GID is unreliable - in around one of five runs the uid/gid take the
> default instead of the configured value.
> 
> I'm intending to open a Red Hat BZ for this problem today.

Marc got there first:

https://bugzilla.redhat.com/show_bug.cgi?id=518575

Cheers,
Bryn.

Re: Issue with setting uid/gid/mode in multipath.conf

[Chandra Seetharaman]

Thanks for the info, Mark.
On Fri, 2009-08-21 at 12:30 +1000, Mark Goodwin wrote:
> Chandra Seetharaman wrote:
> > Hi Benjamin,
> > 
> > I have a small issue with setting the uid/gid/mode with multipath tools.
> > 
> > I have the following in my /etc/mulitpath.conf file
> > ------------------
> > multipaths {
> >         multipath {
> >                 wwid 3600a0b800011a1ee00003f834a3f7a65
> >                 alias dev4
> >                 mode    0666
> >                 uid     1001
> >                 gid     1001
> >         }
> > }
> > -------------------
> > 
> > After adding this, I do a "multipath -F" following by "multipath" (or
> > multipath -F followed by /etc/init.d/multipathd restart), I see the
> > attributes are set properly on the device.
> > 
> > I reboot the system, the device is created (under /dev/mapper) but
> > attributes are not set as defined in the multipath.conf file.
> > 
> > Have you seen this issue ? 
> > 
> > I am using RHEL 5.3 ga version (kernel and tools).
> > 
> 
> yes we've recently also seen this issue and can reproduce it without
> any need for a reboot, see https://bugzilla.redhat.com/518575
> 
> It seems to be a racy interaction of some kind between udevd and multipathd.
> 
> Cheers
> -- Mark
> 
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