From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx1.redhat.com (ext-mx10.extmail.prod.ext.phx2.redhat.com [10.5.110.39]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 79BD71001DDB for ; Mon, 3 Jun 2019 21:13:42 +0000 (UTC) Received: from mail.service4.ru (mail.service4.ru [195.201.68.178]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 5A2FB22388B for ; Mon, 3 Jun 2019 21:13:09 +0000 (UTC) Received: from mail.service4.ru (localhost [127.0.0.1]) by mail.service4.ru (Postfix) with ESMTP id 59B2D40816 for ; Tue, 4 Jun 2019 00:13:02 +0300 (MSK) Received: from mail.service4.ru ([127.0.0.1]) by mail.service4.ru (mail.service4.ru [127.0.0.1]) (amavisd-new, port 10026) with ESMTP id aHrAqAQ0OVjF for ; Tue, 4 Jun 2019 00:13:00 +0300 (MSK) Received: from ilia (89-178-216-202.broadband.corbina.ru [89.178.216.202]) by mail.service4.ru (Postfix) with ESMTPSA id A765840211 for ; Tue, 4 Jun 2019 00:13:00 +0300 (MSK) References: <93f53408-2f37-dec3-5c68-deef021f530c@assyoma.it> <20190603132327.GA32187@reti> <512bbf893225a1b4f6897b7540b09d1c@assyoma.it> From: Ilia Zykov Message-ID: Date: Tue, 4 Jun 2019 00:12:57 +0300 MIME-Version: 1.0 In-Reply-To: <512bbf893225a1b4f6897b7540b09d1c@assyoma.it> Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="------------ms060009060403020303030302" Subject: Re: [linux-lvm] Fast thin volume preallocation? 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: To: linux-lvm@redhat.com This is a cryptographically signed message in MIME format. --------------ms060009060403020303030302 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: quoted-printable >=20 >> Presumably you want a thick volume but inside a thin pool so that you >> can used snapshots? >> If so have you considered the 'external snapshot' feature? >=20 > Yes, in some cases they are quite useful. Still, a fast volume > allocation can be an handy addition. >=20 Hello. Can I use external snapshot for fast zero allocation? "thpool" - is lvmthin with lvm zeroing disabled # lvcreate -n ext2T -V 2TiB --thinpool thpool VG # lvchange --permission r VG/ext2T # lvcreate -n zeroed_lve -s VG/ext2T --thinpool VG/thpool Or it will be the same as zeroing enabled? 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