From: Josh Durgin <josh.durgin@dreamhost.com>
To: Eric_YH_Chen@wistron.com
Cc: tommi.virtanen@dreamhost.com, ceph-devel@vger.kernel.org,
Chris_YT_Huang@wistron.com
Subject: Re: rbd device would disappear after re-boot
Date: Thu, 08 Dec 2011 16:58:21 -0800 [thread overview]
Message-ID: <4EE15D2D.8070204@dreamhost.com> (raw)
In-Reply-To: <8512670932FB654F81AF0FEF1BE6D49D943CC9@WHQBEMAIL1.whq.wistron>
On 12/07/2011 11:31 PM, Eric_YH_Chen@wistron.com wrote:
> Hi, Tommi:
>
> What I see is like this.
>
> lrwxrwxrwx 1 root root 10 2011-12-07 16:48 foo1:0 -> ../../rbd0
> lrwxrwxrwx 1 root root 10 2011-12-07 16:50 foo2:1 -> ../../rbd1
>
> The extra number (:0 and :1) behind the image name make the problem still exists.
I'm not sure why we had the device number in the udev rule. I removed it
in 891025e539a92b5d75011e2e75c475fc0c272042.
>
> -----Original Message-----
> From: Tommi Virtanen [mailto:tommi.virtanen@dreamhost.com]
> Sent: Thursday, December 08, 2011 1:31 AM
> To: Eric YH Chen/WHQ/Wistron
> Cc: ceph-devel@vger.kernel.org; Chris YT Huang/WHQ/Wistron
> Subject: Re: rbd device would disappear after re-boot
>
> On Tue, Dec 6, 2011 at 18:38,<Eric_YH_Chen@wistron.com> wrote:
>> I have another little question. Could I map specific image to specific device?
>>
>> For example:
>> Before re-boot
>> id pool image snap device
>> 0 rbd foo1 - /dev/rbd0
>> 1 rbd foo3 - /dev/rbd2
>>
>> How could I re-map the image(foo3) to device(/dev/rbd2) but skip rbd1? The command provided by ceph CLI cannot achieve this.
>>
>> If I re-map the image to another device, it would not sync with iSCSI configuration and may cause problem.
>
> I'm just confirming what Damien said. Don't rely on the numbering to
> be consistent even from one boot to another; we provide a udev helper
> that assigns more permanent names, based on the pool, image name, and
> potentially snapshot name. You'll get a symlink like
> /dev/rbd/POOL/IMAGE or /dev/rbd/POOL/IMAGE@SNAP, use that name.
prev parent reply other threads:[~2011-12-09 0:58 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-06 9:31 rbd device would disappear after re-boot Eric_YH_Chen
2011-12-06 19:10 ` Tommi Virtanen
2011-12-07 2:38 ` Eric_YH_Chen
2011-12-07 2:48 ` Damien Churchill
2011-12-07 17:31 ` Tommi Virtanen
2011-12-08 7:31 ` Eric_YH_Chen
2011-12-09 0:58 ` Josh Durgin [this message]
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