[sheepdog-users] runtime requirements?

[Miles Fidelman]

Any idea what it actually does? (The qemu documentation is pretty silent 
on it).

Why wouldn't one do something like "nbd-server ..." to publish the volume?

Miles

Andrew J. Hobbs wrote:
> qemu-nbd is a helper app in the qemu package.  You can then access them
> as normal from xen as an nbd provider.
>
> On 03/13/2014 01:16 PM, Miles Fidelman wrote:
>> Re. the iSCCI vs. NBD options:
>>
>> The iSCSI instructions are all based around standard iSCSI initiator
>> and target commands, but the documentation for NBD (such as it is) says;
>>
>> 1.
>>
>>     Create a Sheepdog image
>>
>>     $ qemu-img create sheepdog:image 4G
>>
>> 2.
>>
>>     Start qemu-nbd on the one of Sheepdog servers
>>
>>     $ qemu-nbd sheepdog:image
>>
>> Which suggests that one has to have qemu running to publish NBD
>> volumes - or is that just for mounting an NBD image from within a VM?
>> The key question: can I set up Sheepdog to publish an NBD volume, and
>> access it through native o/s or xen NBD drivers?
>>
>> Andrew: What's your environment look like (what's Sheepdog running on,
>> what kinds of virtualization environment, what kinds of VMs?).
>>
>> Thanks!
>>
>> Miles
>>
>>
>> Andrew J. Hobbs wrote:
>>> While I haven't personally had to use them in this case (yet).  I'd
>>> try the iSCSI or NBD options for sheepdog.   I routinely run
>>> benchmarks when trying new combinations, if you do for both of these
>>> situations, I'd be very interested in your results.
>>>
>>> I keep a linux image with a fully allocated disk to run benchmarks on
>>> with the below command.
>>>
>>>
>>> dd if=/dev/zero of=/test.out bs=4k count=1000000 oflag=direct
>>>
>>>
>>>
>>> On 03/13/2014 10:58 AM, Miles Fidelman wrote:
>>>
>>> Since I'm running Xen paravirtualized (for speed in all cases, and
>>> for 2 servers, because they don't have
>>> hardware virtualization available), QEMU based drivers aren't
>>> available - hence my reasons for not
>>> being able to use Sheepdog in the past.
>>>
>>> iSCSI solves the problem.  So would NFS.
>>>
>>> Thanks!
>>>
>>> Miles
>>>
>>>
>>>
>>>
>>>
>>>
>>>
>>
>
>


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