[Qemu-devel] Re: [PATCH v2 2/2] rbd: allow configuration of rados from the rbd filename

[Yoshiaki Tamura]

2011/4/7 Stefan Hajnoczi <address@hidden>:
> On Thu, Apr 07, 2011 at 10:14:03AM +0900, Yoshiaki Tamura wrote:
>> 2011/3/29 Josh Durgin <address@hidden>:
>> > The new format is 
>> > rbd:pool/address@hidden:option1=value1[:option2=value2...]]
>> > Each option is used to configure rados, and may be any Ceph option, or 
>> > "conf".
>> > The "conf" option specifies a Ceph configuration file to read.
>> >
>> > This allows rbd volumes from more than one Ceph cluster to be used by
>> > specifying different monitor addresses, as well as having different
>> > logging levels or locations for different volumes.
>> >
>> > Signed-off-by: Josh Durgin <address@hidden>
>> > ---
>> >  block/rbd.c |  119 
>> > ++++++++++++++++++++++++++++++++++++++++++++++++++--------
>> >  1 files changed, 102 insertions(+), 17 deletions(-)
>> >
>> > diff --git a/block/rbd.c b/block/rbd.c
>> > index cb76dd3..bc3323d 100644
>> > --- a/block/rbd.c
>> > +++ b/block/rbd.c
>> > @@ -22,13 +22,17 @@
>> >  /*
>> >  * When specifying the image filename use:
>> >  *
>> > - * rbd:poolname/devicename
>> > + * rbd:poolname/address@hidden:option1=value1[:option2=value2...]]
>>
>> I'm not sure IIUC, but currently this @snapshotname seems to be
>> meaningless; it doesn't allow you to boot from a snapshot because it's
>> read only.  Am I misunderstanding or tested incorrectly?
>
> Read-only block devices are supported by QEMU and can be useful.

I agree.  My expectation was that @snapshotname is introduced to have
writable snapshot.

Yoshi

>
> Stefan
>