Hi,
i see,
could this be relevant?
SCSI disk limitations: Defining the number of disk devices on Linux
http://publib.boulder.ibm.com/infocenter/dsichelp/ds6000ic/index.jsp?topic=%2Fcom.ibm.storage.smric.help.doc%2Ff2c_linuxscsilimit_2hsag9.html
also from the description of the following 2 sections, it seems
this limit can be made much higher?
http://www.makelinux.net/ldd3/chp-3-sect-2
http://www.makelinux.net/ldd3/chp-16-sect-1
Best Regards.
On Thu, Oct 18, 2012 at 10:18 AM, Alex Elder <elder@xxxxxxxxxxx> wrote:
> On 10/17/2012 09:15 PM, Christian Huang wrote:
>> Hi,
>> what is the maximum number of rbd devices that can be mapped on a
>> single host?
>> we recently did a test to mount a large number of rbd devices and
>> hit a wall around 230
>> with the following message
>
> That sounds about right. We were just discussing this earlier
> this week. It's limited at the moment by the number of major
> device numbers available on the system, and I think you found
> that limit. We would obviously like to have a solution for
> this but we've only just started considering options.
>
> -Alex
>
>> with 230 rbd devices already mapped, the next one yielded this.
>> Console output
>> wistor@wistor-002:~$ sudo rbd map test299
>> add failed: (16) Device or resource busy
>>
>> dmesg
>> [77962.346749] register_blkdev: failed to get major for rbd229
>>
>> Chris.
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