From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <4C17E16B.8000708@cfl.rr.com> Date: Tue, 15 Jun 2010 16:24:11 -0400 From: Phillip Susi MIME-Version: 1.0 References: <4C179B03.2000102@cfl.rr.com> <20100615164709.GG15698@agk-dp.fab.redhat.com> <4C17BC76.7090506@cfl.rr.com> <4C17D1BF.9010103@redhat.com> In-Reply-To: <4C17D1BF.9010103@redhat.com> Content-Transfer-Encoding: 7bit Subject: Re: [linux-lvm] Why does every lvm command insist on touching every pv? Reply-To: LVM general discussion and development List-Id: LVM general discussion and development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , List-Id: Content-Type: text/plain; charset="us-ascii" To: Takahiro Yasui Cc: linux-lvm@redhat.com On 6/15/2010 3:17 PM, Takahiro Yasui wrote: > Everytime lvm command is executed, all PVs are accessed. > > This is a known issue and what we should fix. If there are a lot of > PVs, execution of lvm command could take a long time. The scan also > affects error recovery time of lvm mirror. > > This is an old reference. > > Introduce metadata cache feature > https://www.redhat.com/archives/lvm-devel/2009-April/msg00014.html This seems to limit the number of metadata copies on pvs that are accessed to one, but I am seeing even block devices that are not pvs accessed, like it is scanning for new pvs. This patch seems like it would help some though, but it is over a year old. Did it never get applied?