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Re: [dm-devel] Native systemd service files for multipathd



On Mon, Aug 22, 2011 at 17:45, Hannes Reinecke <hare suse de> wrote:
> On 08/22/2011 03:47 PM, Christophe Varoqui wrote:
>> On jeu., 2011-06-30 at 14:10 +0000, "J├│hann B. Gu├░mundsson" wrote:
>>>
>>> Is anyone taking a look at porting the multipathd legacy sysv init
>>> script to native systemd unit file?
>>>
>>> I filed 690828 on 2011-03-25 and yet to receive somekind of response on
>>> it and unless some action is taken then a) device-mapper-multipath will
>>> be blocking the Fedora 16 alpha release or b) be ripped out of @base and
>>> be made sure it does not get installed on the official livecd.
>>>
>> What is the status of this request ? Has anyone stepped-in to the job ?
>> If not I'll look into it. If you have Fedora-specific systemd
>> implementation guideline, please point me to the appropriate
>> documentation.
>>
> I have talked with Kay & Lennart about this.
>
> The main problem here is that we don't / can't know if a device is
> multipathed or not; this is basically a policy decision.
> Even a simple switch (multipath on/off) wouldn't suffice here, as this
> particular device might be excluded via the configuration file.
>
> Idea here is to modify the 'multipath' program to determine if a particular
> device is handled by multipath or not. If so, _no other_ configuration must
> be done in that device.
> The multipathd daemon itself already listens on events from the udev socket;
> it should be pretty trivial to convert that to socket activation.
>
> And, of course, we need to solve the mount problem. Last I've heard was that
> systemd _won't_ be handling mounting, which in effect means we cannot mount
> any systems provided via multipath ...
>
> What is the status here?

It fully support mounts on boot, dynamically created, or on hotplug,
with or without automounter support.

But it will not assemble/handle/know anything about any dm/md devices.

Kay


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