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From: Gionatan Danti <>
To: Ryan Launchbury <>
Cc: LVM, development <>,
	Zdenek Kabelac <>
Subject: Re: [linux-lvm] Unable to un-cache logical volume when chunk size is over 1MiB
Date: Mon, 25 Jun 2018 19:19:01 +0200	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Il 24-06-2018 21:18 Ryan Launchbury ha scritto:
> In testing, forcibly removing the cache, via editing the LVM config
> file has caused extensive XFS filesystem corruption, even when backing
> up the metadata first and restoring after the cache device is missing.
> Any advice on how to safely uncache the volume would be massively
> appreciated.

It is my understanding that a writethrough cache should *never* have any 
data that are not on the backing volumes already.
In other words, forcibly removing a writethough cache (ie: disconnetting 
the physical cache device) should not cause any harms to 

Can you show the output of "dmsetup table"?

Danti Gionatan
Supporto Tecnico
Assyoma S.r.l. -
email: -
GPG public key ID: FF5F32A8

  reply	other threads:[~2018-06-25 17:19 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-20  9:18 [linux-lvm] Unable to un-cache logical volume when chunk size is over 1MiB Ryan Launchbury
2018-06-20 10:15 ` Zdenek Kabelac
2018-06-20 11:10   ` Ryan Launchbury
2018-06-22 18:13   ` Gionatan Danti
2018-06-22 19:22     ` Ryan Launchbury
2018-06-22 20:07     ` Zdenek Kabelac
2018-06-23 10:09       ` Gionatan Danti
2018-06-24 19:18         ` Ryan Launchbury
2018-06-25 17:19           ` Gionatan Danti [this message]
2018-06-25 17:20             ` Ryan Launchbury
2018-06-25 17:40               ` Gionatan Danti
2018-07-18 14:25                 ` Ryan Launchbury
2018-07-18 14:58                   ` Douglas Paul
2019-01-21 20:19                     ` Zdenek Kabelac

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