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From: "Jun'ichi Nomura" <j-nomura@ce.jp.nec.com>
To: device-mapper development <dm-devel@redhat.com>
Subject: Re: Snapshots
Date: Fri, 21 Dec 2007 20:28:05 -0500	[thread overview]
Message-ID: <476C6825.7070701@ce.jp.nec.com> (raw)
In-Reply-To: <476AC672.4030405@cfl.rr.com>

Phillip Susi wrote:
> Jun'ichi Nomura wrote:
>> So, you have to put the linear mapping *before* that.
>> Then, the top-level block device will be locked but you can
>> still change the underlying mappings.
> 
> So using a disk device as a dm target locks it.  DM won't use a disk
> device as a target if it is locked.

If a device is locked by a DM device on top of it,
other DM device can still use the device as a target.

Also, even if a DM device is locked by mount, you can still change
the table of the DM device.

> Are you saying that dm can use
> another dm device as a target, even if it is already locked by being
> used as another dm target?

I'm not sure if I understand your last sentence correctly.
Does the above comment answer to your question?

Thanks,
-- 
Jun'ichi Nomura, NEC Corporation of America

  reply	other threads:[~2007-12-22  1:28 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-12-18 19:57 Snapshots Phillip Susi
2007-12-18 22:38 ` Snapshots Jun'ichi Nomura
2007-12-19 16:42   ` Snapshots Phillip Susi
2007-12-19 20:59     ` Snapshots Jun'ichi Nomura
2007-12-20 19:45       ` Snapshots Phillip Susi
2007-12-22  1:28         ` Jun'ichi Nomura [this message]
  -- strict thread matches above, loose matches on Subject: below --
2017-09-15 17:28 snapshots Two Spirit
2017-09-15 17:37 ` snapshots Sage Weil
2017-09-15 17:42   ` snapshots Two Spirit
2017-09-15 18:25     ` snapshots Sage Weil
2017-09-15 18:59       ` snapshots Eric Eastman
2017-09-15 19:33         ` snapshots Wyllys Ingersoll
2017-09-15 20:22           ` snapshots Sage Weil
2017-09-15 21:23             ` snapshots Wyllys Ingersoll

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