From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 73D1FC433EF for ; Sun, 14 Nov 2021 08:52:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 40E9960E54 for ; Sun, 14 Nov 2021 08:52:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230027AbhKNIy4 (ORCPT ); Sun, 14 Nov 2021 03:54:56 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:59358 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229537AbhKNIyy (ORCPT ); Sun, 14 Nov 2021 03:54:54 -0500 X-Greylist: delayed 270 seconds by postgrey-1.37 at lindbergh.monkeyblade.net; Sun, 14 Nov 2021 00:51:58 PST Received: from rin.romanrm.net (rin.romanrm.net [IPv6:2001:bc8:2dd2:1000::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1C103C061746 for ; Sun, 14 Nov 2021 00:51:57 -0800 (PST) Received: from nvm (nvm2.home.romanrm.net [IPv6:fd39::4a:3cff:fe57:d6b5]) by rin.romanrm.net (Postfix) with SMTP id 46335626; Sun, 14 Nov 2021 08:47:24 +0000 (UTC) Date: Sun, 14 Nov 2021 13:47:23 +0500 From: Roman Mamedov To: David T-G Cc: Linux RAID Subject: Re: overlays on dd images of 4T drives Message-ID: <20211114134723.46092368@nvm> In-Reply-To: <20211114022924.GA21337@opal1.opalstack.com> References: <20211114022924.GA21337@opal1.opalstack.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org On Sun, 14 Nov 2021 02:29:24 +0000 David T-G wrote: > diskfarm:/mnt/10Traid50md/tmp # ls -goh overlay-sd* > -rw-r--r-- 1 4.0T Nov 12 02:05 overlay-sda1 > -rw-r--r-- 1 4.0T Nov 12 02:05 overlay-sdb1 > -rw-r--r-- 1 4.0T Nov 12 02:05 overlay-sdc1 > diskfarm:/mnt/10Traid50md/tmp # losetup -a > /dev/loop1: [66326]:1059 (/mnt/10Traid50md/tmp/overlay-sdb1) > /dev/loop2: [66326]:1060 (/mnt/10Traid50md/tmp/overlay-sdc1) > /dev/loop0: [66326]:1058 (/mnt/10Traid50md/tmp/overlay-sda1) > > my overlay files and loopback devices. But ... > > It seems that blockdev does not like > > diskfarm:/mnt/10Traid50md/tmp # blockdev --getsize ./overlay-sda1 > blockdev: ioctl error on BLKGETSIZE: Inappropriate ioctl for device > > my files It must be run on block devices, not files, so try: blockdev --getsize /dev/loop0 -- With respect, Roman