From: Josh Durgin <josh.durgin@inktank.com>
To: brady <brady@lamphost.com>
Cc: ceph-devel@vger.kernel.org
Subject: Re: Character limit for rbd block device
Date: Mon, 26 Nov 2012 16:52:37 -0800 [thread overview]
Message-ID: <50B40ED5.7050307@inktank.com> (raw)
In-Reply-To: <50B404DA.50805@lamphost.com>
On 11/26/2012 04:10 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
>
> 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
Which kernel version are you using?
A year ago there was a 40-char limit on objects names in the kernel's
libceph module, hence the failure at 36 char rbd image names (36 char
name + ".rbd" is the format 1 header object name).
This was extended to a 96-char limit in linux 3.2. There's no real limit
in userspace still (http://tracker.newdream.net/issues/1701).
Josh
next prev parent reply other threads:[~2012-11-27 0:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-27 0:10 Character limit for rbd block device brady
2012-11-27 0:52 ` Josh Durgin [this message]
2012-11-27 21:32 ` brady
2012-11-27 3:00 ` Alex Elder
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