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From: Joe Thornber <thornber@redhat.com>
To: device-mapper development <dm-devel@redhat.com>
Cc: Thanos Makatos <thanos.makatos@onapp.com>,
	heinzm@redhat.com, snitzer@redhat.com
Subject: Re: dm-cache failure semantics in write-back mode
Date: Tue, 3 Mar 2015 17:28:12 +0000	[thread overview]
Message-ID: <20150303172811.GB23166@debian> (raw)
In-Reply-To: <CAM2wQBsS2hyA674CspKx6xZ49Fc1a=53UghaT5JkAPpjT3D_Ng@mail.gmail.com>

On Tue, Mar 03, 2015 at 05:13:37PM +0000, Thanos Makatos wrote:
> Thanks, Joe. So just to make sure I've understood correctly, if the SSD
> cache is configured as a write-back cache but the device cache is
> disabled/set to write-though on the HDD and the SSD, then there is no risk
> of data loss in the event of a failure. Is my understanding correct?

IO that has completed will have really hit the disk.

  reply	other threads:[~2015-03-03 17:28 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-02-17 12:15 dm-cache failure semantics in write-back mode Thanos Makatos
2015-03-03 15:53 ` Thanos Makatos
2015-03-03 16:19   ` Joe Thornber
2015-03-03 17:13     ` Thanos Makatos
2015-03-03 17:28       ` Joe Thornber [this message]
2015-03-03 21:58       ` Spelic
2015-03-05 14:06         ` Thanos Makatos

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