From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx13.extmail.prod.ext.phx2.redhat.com [10.5.110.42]) by smtp.corp.redhat.com (Postfix) with ESMTPS id A4F425D6D0 for ; Tue, 10 Sep 2019 22:58:25 +0000 (UTC) Received: from mr012msb.fastweb.it (mr012msb.fastweb.it [85.18.95.109]) (using TLSv1 with cipher ECDHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 33B843091D69 for ; Tue, 10 Sep 2019 22:58:22 +0000 (UTC) Received: from ceres.assyoma.it (93.63.55.57) by mr012msb.fastweb.it (5.8.208) id 5D4007AA03E0B3F2 for linux-lvm@redhat.com; Wed, 11 Sep 2019 00:58:20 +0200 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Date: Wed, 11 Sep 2019 00:58:20 +0200 From: Gionatan Danti Message-ID: Subject: [linux-lvm] Forcing a specific io scheduler 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"; format="flowed" To: linux-lvm@redhat.com Hi all, I have a (virtual) block devices which does not expose any io scheduler: [root@localhost block]# cat /sys/block/zd0/queue/scheduler none I created an lvm volume on top of that block devices with: [root@localhost ~]# pvcreate /dev/zd0 Physical volume "/dev/zd0" successfully created. [root@localhost ~]# vgcreate vg_test /dev/zd0 Volume group "vg_test" successfully created [root@localhost ~]# lvcreate vg_test --name lv_test -l +100%FREE Logical volume "lv_test" created. With my surprise, I can not select any additional io scheduler: [root@localhost block]# cat /sys/block/dm-2/queue/scheduler none I am missing something? Can a scheduler be forced on a lvm volume? Thanks. -- Danti Gionatan Supporto Tecnico Assyoma S.r.l. - www.assyoma.it email: g.danti@assyoma.it - info@assyoma.it GPG public key ID: FF5F32A8