[dm-devel] PATCH 0/4] multipath-tools: Ceph rbd support v2

[Mike Christie]

On 08/09/2016 10:36 AM, Christophe Varoqui wrote:
> Merged.
> 

Thanks.

> I think it is worth advertizing here that the build now requires rados.h.
> 

Sorry about adding the silly dependency. How about the attached patch to
make the rbd checker only be built if the user requests it. In the
documentation for my use, I will describe how to build it. This way
majority of users will not be bothered.


> Thanks.
> 
> On Mon, Aug 8, 2016 at 2:01 PM, Mike Christie <mchristi at redhat.com> wrote:
> 
>> The following patches made over Christophe's tree today,
>> add Ceph rbd support for handling blacklisted devices.
>>
>>
>> This is not general support for rbd and multipath. There is
>> no boot/root support and it does not support features like
>> multibus. My use is for HA configurations, specifically for exporting
>> rbd images through multiple LIO instances. In this case, we have one
>> rbd instance that has the ceph rbd exclusive lock and it can send
>> WRITE requests. If that host becomes unreachable, then another host
>> will grab the lock, and blacklist the original host to prevent it from
>> sending stale IO (when blacklisted IO will be failed by the OSD).
>>
>> To recover from that type of scenario, this patchset adds a repair()
>> callout to the checker. If the path is in the PATH_DOWN state this
>> callout can be used to fix it up. For my case, I am remapping
>> the device to flush stale IO and cleanup the old lock,
>> and then unblacklisting the path, so it can be used again.
>>
>> Changes since v1:
>> - Drop ID_UID use and implemented sysfs getuid support.
>> - Drop settings that were defaults and follow template.
>> - Fix ceph auth/user.
>>
>>
> 
> 
> 
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