From: Gionatan Danti <g.danti@assyoma.it>
To: Zdenek Kabelac <zkabelac@redhat.com>,
LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] Reserve space for specific thin logical volumes
Date: Tue, 12 Sep 2017 18:57:21 +0200 [thread overview]
Message-ID: <0ef779b9-1725-4764-0664-0002344532dd@assyoma.it> (raw)
In-Reply-To: <b51c8dfd-bdd0-2e38-cc47-bef358bbc8e6@redhat.com>
On 12/09/2017 14:03, Zdenek Kabelac wrote:> # lvs -a
> LV VG Attr LSize Pool Origin Data% Meta% Move
> Log Cpy%Sync Convert
> [lvol0_pmspare] vg ewi------- 2,00m
> lvol1 vg Vwi-a-tz-- 20,00m pool 40,00
> pool vg twi-aotz-- 10,00m 80,00 1,95
> [pool_tdata] vg Twi-ao---- 10,00m
> [pool_tmeta] vg ewi-ao---- 2,00m
> [root@linux export]# lvcreate -V10 vg/pool
> Using default stripesize 64,00 KiB.
> Reducing requested stripe size 64,00 KiB to maximum, physical extent
> size 32,00 KiB.
> Cannot create new thin volume, free space in thin pool vg/pool
> reached threshold.
>
> # lvcreate -s vg/lvol1
> Using default stripesize 64,00 KiB.
> Reducing requested stripe size 64,00 KiB to maximum, physical extent
> size 32,00 KiB.
> Cannot create new thin volume, free space in thin pool vg/pool
> reached threshold.
>
> # grep thin_pool_autoextend_threshold /etc/lvm/lvm.conf
> # Configuration option activation/thin_pool_autoextend_threshold.
> # thin_pool_autoextend_threshold = 70
> thin_pool_autoextend_threshold = 70
>
> So as you can see - lvm2 clearly prohibits you to create a new thinLV
> when you are above defined threshold.
Hi Zdenek,
this is very good news (for me at least). Thank you very much for
pointing me that!
Anyway, I can not find the relative configuration variable in lvm.conf.
I am on 2.02.166(2)-RHEL7, should I use a newer LVM version to set this
threshold?
> To keep things single for a user - we have a single threshold value.
>
>
> So what else is missing ?
This is a very good step, indeed. However, multiple threshold (maybe
attached/counted against the single thin volume, in a manner similar to
how refreservation does for ZVOLs) would be even better (in my use case,
at least).
> Unfortunatelly lvm2 nor dm can be responsible for whole kernel logic and
> all user-land apps...
Again, I am *not* saying, nor asking, that.
I would simply like to use thinp without fearing that "forgotten"
snapshot fill up the thin pool. I have shown how this can easily
achieved with ZVOLs and careful use/setting of the refreservation value,
without any upper layer knowledge and/or intra-layer communications.
> So you are already happy right :) ?
Sure! :)
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
next prev parent reply other threads:[~2017-09-12 16:57 UTC|newest]
Thread overview: 91+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-09-08 10:35 [linux-lvm] Reserve space for specific thin logical volumes Gionatan Danti
2017-09-08 11:06 ` Xen
2017-09-09 22:04 ` Gionatan Danti
2017-09-11 10:35 ` Zdenek Kabelac
2017-09-11 10:55 ` Xen
2017-09-11 11:20 ` Zdenek Kabelac
2017-09-11 12:06 ` Xen
2017-09-11 12:45 ` Xen
2017-09-11 13:11 ` Zdenek Kabelac
2017-09-11 13:46 ` Xen
2017-09-12 11:46 ` Zdenek Kabelac
2017-09-12 12:37 ` Xen
2017-09-12 14:37 ` Zdenek Kabelac
2017-09-12 16:44 ` Xen
2017-09-12 17:14 ` Gionatan Danti
2017-09-12 21:57 ` Zdenek Kabelac
2017-09-13 17:41 ` Xen
2017-09-13 19:17 ` Zdenek Kabelac
2017-09-14 3:19 ` Xen
2017-09-12 17:00 ` Gionatan Danti
2017-09-12 23:25 ` Brassow Jonathan
2017-09-13 8:15 ` Gionatan Danti
2017-09-13 8:33 ` Zdenek Kabelac
2017-09-13 18:43 ` Xen
2017-09-13 19:35 ` Zdenek Kabelac
2017-09-14 5:59 ` Xen
2017-09-14 19:05 ` Zdenek Kabelac
2017-09-15 2:06 ` Brassow Jonathan
2017-09-15 6:02 ` Gionatan Danti
2017-09-15 8:37 ` Xen
2017-09-15 7:34 ` Xen
2017-09-15 9:22 ` Zdenek Kabelac
2017-09-16 22:33 ` Xen
2017-09-17 6:31 ` Xen
2017-09-17 7:10 ` Xen
2017-09-18 19:20 ` Gionatan Danti
2017-09-20 13:05 ` Xen
2017-09-21 9:49 ` Zdenek Kabelac
2017-09-21 10:22 ` Xen
2017-09-21 13:02 ` Zdenek Kabelac
2017-09-21 14:34 ` [linux-lvm] Clarification (and limitation) of the kernel feature I proposed Xen
2017-09-21 14:49 ` [linux-lvm] Reserve space for specific thin logical volumes Xen
2017-09-21 20:32 ` Zdenek Kabelac
2017-09-18 8:56 ` Zdenek Kabelac
2017-09-11 14:00 ` Xen
2017-09-11 17:34 ` Zdenek Kabelac
2017-09-11 15:31 ` Eric Ren
2017-09-11 15:52 ` Zdenek Kabelac
2017-09-11 21:35 ` Eric Ren
2017-09-11 17:41 ` David Teigland
2017-09-11 21:08 ` Eric Ren
2017-09-11 16:55 ` David Teigland
2017-09-11 17:43 ` Zdenek Kabelac
2017-09-11 21:59 ` Gionatan Danti
2017-09-12 11:01 ` Zdenek Kabelac
2017-09-12 11:34 ` Gionatan Danti
2017-09-12 12:03 ` Zdenek Kabelac
2017-09-12 12:47 ` Xen
2017-09-12 13:51 ` pattonme
2017-09-12 14:57 ` Zdenek Kabelac
2017-09-12 16:49 ` Xen
2017-09-12 16:57 ` Gionatan Danti [this message]
[not found] <832949972.1610294.1505170613541.ref@mail.yahoo.com>
2017-09-11 22:56 ` matthew patton
2017-09-12 5:28 ` Gionatan Danti
[not found] <1806055156.426333.1505228581063.ref@mail.yahoo.com>
2017-09-12 15:03 ` matthew patton
2017-09-12 17:09 ` Gionatan Danti
2017-09-12 22:41 ` Zdenek Kabelac
2017-09-12 22:55 ` Gionatan Danti
2017-09-12 23:11 ` Zdenek Kabelac
[not found] <418002318.647314.1505245480415.ref@mail.yahoo.com>
[not found] ` <418002318.647314.1505245480415@mail.yahoo.com>
2017-09-12 21:36 ` Gionatan Danti
2017-09-12 22:16 ` Zdenek Kabelac
2017-09-12 22:41 ` Gionatan Danti
2017-09-12 23:02 ` Zdenek Kabelac
2017-09-12 23:15 ` Gionatan Danti
2017-09-12 23:31 ` Zdenek Kabelac
2017-09-13 8:21 ` Gionatan Danti
[not found] <1575245610.821680.1505258554456.ref@mail.yahoo.com>
2017-09-12 23:22 ` matthew patton
2017-09-13 7:53 ` Gionatan Danti
2017-09-13 8:15 ` Zdenek Kabelac
2017-09-13 8:28 ` Gionatan Danti
2017-09-13 8:44 ` Zdenek Kabelac
2017-09-13 10:46 ` Gionatan Danti
[not found] <691633892.829188.1505258696384.ref@mail.yahoo.com>
2017-09-12 23:24 ` matthew patton
[not found] <57374453.843393.1505261050977.ref@mail.yahoo.com>
2017-09-13 0:04 ` matthew patton
2017-09-13 7:10 ` Zdenek Kabelac
[not found] <1771452279.913055.1505269434212.ref@mail.yahoo.com>
2017-09-13 2:23 ` matthew patton
2017-09-13 7:25 ` Zdenek Kabelac
[not found] <498090067.1559855.1505338608244.ref@mail.yahoo.com>
2017-09-13 21:36 ` matthew patton
[not found] <914479528.2618507.1505463313888.ref@mail.yahoo.com>
2017-09-15 8:15 ` matthew patton
2017-09-15 10:01 ` Zdenek Kabelac
2017-09-15 18:35 ` Xen
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