On Fri, Sep 4, 2015 at 4:44 PM, Ilya Dryomov <idryomov@xxxxxxxxx> wrote:
> On Fri, Sep 4, 2015 at 4:30 PM, Sebastien Han <seb@xxxxxxxxxx> wrote:
>> Which Kernel are you running on?
>> These days, the theoretical limit is 65536 AFAIK.
>>
>> Ilya would know the kernel needed for that.
>
> 3.14 or later, and, if you are loading your kernel modules by hand or
> have your distro load them for you during boot, you'll need to make
> sure rbd.ko is loaded with single_major=T. (rbd cli tool loads rbd.ko
> with single_major=T but won't reload if the module is already loaded.)
Sorry, I meant single_major=Y (or =1) - I always mix these up.
And yes, 248 devices is about is high as you can go on pre-3.14 or on
post-3.14 with single_major=N.
Thanks,
Ilya
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