Re: Character limit for rbd block device

[Alex Elder <elder@inktank.com>]

On 11/26/2012 06:10 PM, brady wrote:
> Hello,
>     I have a general question. Is there a specific character limit for
> rbd block devices? In attempting to map a block device with a name that
> is 36 characters or more, I am getting the following error:
> 
> rbd map (36+ character name) --user admin --secret /etc/ceph/keyring.key
> add failed: (2) No such file or directory

We can set the maximum supported length almost arbitrarily high,
although we use the image name in a path component.  Linux limits
such file names to 255 bytes normally.

As Josh said, the limit is higher than what you mention.  Do
you have any thoughts on what constitutes a reasonable limit?
Are you using some sort of naming convention that produces
your 36+ byte image names?

Thanks.

					-Alex

>     When using the same command to map a device with 35 characters or
> less, the device is mapped as expected. Any insight into this issue
> would be greatly appreciated.
> 
> -Brady
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