From: Zdenek Kabelac <zdenek.kabelac@gmail.com>
To: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] LVM cache (or dm-cache) shutdown
Date: Sat, 17 Oct 2015 19:49:30 +0200 [thread overview]
Message-ID: <56228A2A.6050908@gmail.com> (raw)
In-Reply-To: <mvrdlj$6r9$1@ger.gmane.org>
Dne 16.10.2015 v 19:54 Ian Pilcher napsal(a):
> On 09/11/2015 07:51 AM, Joe Thornber wrote:
>> No, this is not expected. The most likely cause is your system was
>> not shutdown cleanly so dm-cache has no choice but to assume all
>> blocks are dirty and need writing back. Make sure your volumes are
>> being deactivated as part of shutdown.
>
> What exactly is required to cleanly shutdown an LVM cache or dm-cache
> device?
>
> AFAICT, systemd does a DM_DEV_REMOVE ioctl on all device mapper devices
> during shutdown/reboot. Is this sufficient?
ONLY if the give device are UNUSED.
If the volume is e.g. mounted - then 'remove' is irrelevant.
You can't remove device with open count != 0.
(check with: dmsetup info -c)
Zdenek
prev parent reply other threads:[~2015-10-17 17:49 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-10 9:30 [linux-lvm] Strange dm-cache activity at startup Stefan Ring
2015-09-10 12:59 ` Zdenek Kabelac
2015-09-10 13:11 ` Stefan Ring
2015-09-10 13:48 ` Zdenek Kabelac
2015-09-11 12:51 ` Joe Thornber
2015-09-11 13:28 ` John Stoffel
2015-09-11 14:50 ` Simon O'Riordan
2015-09-11 15:32 ` John Stoffel
2015-09-16 7:48 ` Stefan Ring
2015-09-17 15:08 ` Stefan Ring
2015-10-16 17:54 ` [linux-lvm] LVM cache (or dm-cache) shutdown Ian Pilcher
2015-10-17 17:49 ` Zdenek Kabelac [this message]
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