From mboxrd@z Thu Jan 1 00:00:00 1970 From: Martin Wilck Subject: Re: [PATCH 2/2] DDF: new algorithm for subarray UUID Date: Sat, 07 Sep 2013 21:23:22 +0200 Message-ID: <522B7D2A.4000409@arcor.de> References: <1378502781-849-1-git-send-email-mwilck@arcor.de> <1378502781-849-2-git-send-email-mwilck@arcor.de> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1378502781-849-2-git-send-email-mwilck@arcor.de> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org Cc: neilb@suse.de List-Id: linux-raid.ids On 09/06/2013 11:26 PM, mwilck@arcor.de wrote: > Some fake RAID BIOSes (in particular, LSI ones) change the > VD GUID at every boot. These GUIDs are not suitable for > identifying an array. Luckily the header GUID appears to > remain constant. > > We construct a pseudo-UUID from the header GUID and those > properties of the subarray that we expect to remain constant. Thinking about it once more, it may actually be better to construct the subarray UUID only from the container GUID and the member number (and name), because if we implement Grow or Reshape for DDF, the other properties might change. I'm open for comments and suggestions. Martin