From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mimecast-mx02.redhat.com (mimecast02.extmail.prod.ext.rdu2.redhat.com [10.11.55.18]) by smtp.corp.redhat.com (Postfix) with ESMTPS id 18BC8F00E4 for ; Wed, 16 Sep 2020 04:31:47 +0000 (UTC) Received: from us-smtp-1.mimecast.com (us-smtp-2.mimecast.com [205.139.110.61]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 7E6BF800161 for ; Wed, 16 Sep 2020 04:31:47 +0000 (UTC) From: =?utf-8?Q?Tomas_Dalebj=C3=B6rk?= Mime-Version: 1.0 (1.0) Date: Wed, 16 Sep 2020 06:31:40 +0200 Message-Id: <80241AC1-65CF-45B8-A370-DC7E56F3F675@gmail.com> References: In-Reply-To: Content-Transfer-Encoding: quoted-printable Subject: Re: [linux-lvm] lvm limitations 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="iso-8859-1" To: Gionatan Danti Cc: LVM general discussion and development , Zdenek Kabelac I also consider to build this application as an open source project but of course it would be good to have some sponsors I have been working as a C developer for over 35 years, and have created ke= rnel drivers for both commercial and open source operating system and developed several commercial applications that have been used on many p= laces by banks, military, education etc do you know where to get sponsors from if any are likely to help? regards Tomas Sent from my iPhone > On 16 Sep 2020, at 00:26, Gionatan Danti wrote: >=20 > =EF=BB=BFIl 2020-09-15 23:47 Zdenek Kabelac ha scritto: >> You likely don't need such amount of 'snapshots' and you will need to >> implement something to remove snapshot without need, so i.e. after a >> day you will keep maybe 'every-4-hour' and after couple days maybe >> only a day-level snapshot. After a month per-week and so one. >=20 > Agree. "Snapshot-thinning" is an essential part of snapshot management. >=20 >> Speaking of thin volumes - there can be at most 2^24 thin devices >> (this is hard limit you've ask for ;)) - but you have only ~16GiB of >> metadata to store all of them - which gives you ~1KiB of data per such >> volume - >> quite frankly this is not too much - unless as said - your volumes >> are not changed at all - but then why you would be building all this... >> That all said - if you really need that intensive amount of snapshoting, >> lvm2 is likely not for you - and you will need to build something on you= r own, >> as you will need way more efficient and 'targeted' solution for your pur= pose. >=20 > Thinvols are not activated by default - this means it should be not a big= problem managing some hundreds of them, as the OP ask. Or am I missing som= ething? >=20 > Regards. >=20 > --=20 > Danti Gionatan > Supporto Tecnico > Assyoma S.r.l. - www.assyoma.it > email: g.danti@assyoma.it - info@assyoma.it > GPG public key ID: FF5F32A8