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Re: [dm-devel] good dm-mpath test setup?

On 06/05/2014 01:50 PM, Christoph Hellwig wrote:
I've been looking into support blk-mq/scsi-mq in dm-mpath, but I'm
already running into issues with mainline.  I created a couple luns
(without second path) using iet, and then using the iscsi initiator
to access them.  But it seems like no I/O is possible through dm-mpath
for this simple setup as the kpartx processes spawned by udev already
hang.  Is dm-mpath (default config, no multipath.conf) support to work
for a single path setup, or is this expected behavior?

Hmm. This shouldn't happen.

But be aware, that multipath doesn't play well together with systemd currently. I've done plenty of fixes to get it up and running for SLES12; once they've stabilized I'll be sending them mainline.

But for a stable testbed I would recommend against systemd currently.

Does anyone have a good default iet or maybe lio config for dm-mpath

The easiest bit would be set set up lio in loopback mode, and map two luns pointing to the same device.

I've attached a small script I'm using for a quick test here.


Dr. Hannes Reinecke		      zSeries & Storage
hare suse de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
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Attachment: setup_loopback.sh
Description: application/shellscript

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