From: Eric Ren <zren@suse.com>
To: Zdenek Kabelac <zkabelac@redhat.com>
Cc: 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 05:35:53 +0800 [thread overview]
Message-ID: <db8ea14b-afdf-5297-3e38-12ef7bbe4d89@suse.com> (raw)
In-Reply-To: <c53601ab-e003-0c9b-038f-a3f6475a1e6a@redhat.com>
Hi Zdenek,
> lvm2 is using upstream community BZ located here:
>
> https://bugzilla.redhat.com/enter_bug.cgi?product=LVM%20and%20device-mapper
>
>
> You can check RHBZ easily for all lvm2 bZ
> (mixes RHEL/Fedora/Upstream)
>
> We usually want to have upstream BZ being linked with Community BZ,
> but sometimes it's driven through other channel - not ideal - but
> still easily search-able.
Yes, it's a place where problems are discussed. Thanks for your reminder :)
> [...snip...]
> It's should be opposite case - unless something regressed recently...
> Easiest is to write out lvm2 test suite some test.
>
> And eventually bisect which commit broke it...
Good to know! I will find time to test different versions on both
openSUSE and Fedora.
>
>> - pvmove is slow. I know it's not fault of LVM. The time is almost
>> spent in DM (the IO dispatch/copy).
>
> Yeah - this is more or less design issue inside kernel - there are
> some workarounds - but since primary motivation was not to overload
> system - it's been left a sleep a bit - since focus gained 'raid' target
Aha, it's a good reason. Ideally, it would be good for pvmove having
some option to control
the IO rate. I know it's not easy...
> and these pvmove fixes are working with old dm mirror target...
> (i.e. try to use bigger region_size for mirror in lvm.conf (over 512K)
> and evaluate performance - there is something wrong - but core mirror
> developer is busy with raid features ATM....
Thanks for the suggestion.
>
>
>> - snapshot cannot be used in cluster environment. There is a usecase:
>> user has a central backup system
>
> Well, snapshot CANNOT work in cluster.
> What you can do is to split snapshot and attach it different volume,
> but exclusive assess is simply required - there is no synchronization
> of changes like with cmirrord for old mirror....
Got it! Advanced features like snapshot/thinp/dmcache, have their own
metadata. The payment for having those metadata
changes cluster-aware is painful.
> We do our best....
Like you guys have been always doing, thanks!
Regards,
Eric
next prev parent reply other threads:[~2017-09-11 21:35 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 [this message]
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
[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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