[linux-lvm] lvmcache writethrough synchronisation at system startup

Marcin Wolcendorf antymat+redhat at chelmska.waw.pl
Wed Dec 5 15:01:13 UTC 2018


Thanks for your reply!

On Wed, Dec 05, 2018 at 03:23:21PM +0100, Zdenek Kabelac wrote:
> Dne 05. 12. 18 v 7:19 Marcin Wolcendorf napsal(a):
> > My setup:
> > I have 2 mdraid devices: one 24T raid6, one 1T raid1, and one separate SSD. All
> > are LUKS-encrypted, SSD is partitioned into MBR boot partition, encrypted /boot
> > partition and a big encrypted partition for a PV. The encrypted block devices
> > (except /boot) are PVs in my VG. The 24T RAID holds the origin LV, the 1T RAID
> > is made into a cachepool.
> Hi
> I'd say in your case it's very important which version of kernel is in use,
> as there very couple fixes solving this issue in not too long history.

$ uname -a
Linux hal-9002 4.18.0-2-amd64 #1 SMP Debian 4.18.10-2 (2018-11-02) x86_64 GNU/Linux

I think it's not *that* old.
I searched for some info about this issue, but my google mojo left me and I
didn't find anything. Can you point me to some place - like commit or bug
description - where I could read about those fixes? 

> Secondary issue is - it's always good idea there is correct shutdown process
> instead of just 'power-off' althouhg in 'writethrough' case it should not be
> that big issue (but here applies the advice number one - use recent
> kernels).

OK, so how should the shutdown look like?

Delta: We're Amtrak with wings.    -- David Letterman

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