From mboxrd@z Thu Jan 1 00:00:00 1970 From: Paul B. Henson Date: Tue, 4 Feb 2014 17:51:40 -0800 Subject: cache support Message-ID: <096101cf2214$d241ed60$76c5c820$@acm.org> List-Id: To: lvm-devel@redhat.com MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit So I was browsing through the last month or so of list archives and reviewing the cache support under development, and had a question regarding use cases. Unless I am misunderstanding, it looks like the support being built so far addresses the use case of taking two lv's (a large slow origin lv and a small fast cache lv) and combining them into a third lv. Is there any intention to support a use case where you can attach a cache to the underlying pv, and have every single lv created on that pv cached? On a virtualization server I'm working on, I have an md raid1 of two 256G SSD's, and an md raid10 of four 2TB hard drives. What I'd like to do is create a cache device consisting of those two raid devices, and create a pv/vg on top of that. I know that is possible with the raw underlying dm-cache implementation, but it didn't look like the initial code dropped in lvm so far would support something like that? Thanks.