[dm-devel] Native systemd service files for multipathd

[Hannes Reinecke]

On 08/22/2011 03:47 PM, Christophe Varoqui wrote:
> On jeu., 2011-06-30 at 14:10 +0000, "Jóhann B. Guðmundsson" 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?

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
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