linux-lvm.redhat.com archive mirror
 help / color / mirror / Atom feed
From: David Teigland <teigland@redhat.com>
To: Gang He <GHe@suse.com>
Cc: "linux-lvm@redhat.com" <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] About online pvmove/lvresize on shared VG
Date: Wed, 8 Jul 2020 11:05:19 -0500	[thread overview]
Message-ID: <20200708160519.GA23533@redhat.com> (raw)
In-Reply-To: <HE1PR0402MB3514D6153AB2978268A015BDCF670@HE1PR0402MB3514.eurprd04.prod.outlook.com>

On Wed, Jul 08, 2020 at 03:55:55AM +0000, Gang He wrote:
> but I cannot do online LV reduce from one node, 
> the workaround is to switch VG activation_mode to exclusive, run lvreduce command on the node where VG is activated.
> Does this behaviour is by-design? or a bug?

It was intentional since shrinking the cluster fs and LV isn't very common
(not supported for gfs2).

> For pvmove command, I cannot do online pvmove from one node,
> The workaround is to switch VG activation_mode to exclusive, run pvmove command on the node where VG is activated.
> Does this behaviour is by-design? do we do some enhancements in the furture?
> or any workaround to run pvmove under shared  activation_mode? e.g. --lockopt option can help this situation?

pvmove is implemented with mirroring, so that mirroring would need to be
replaced with something that works with concurrent access, e.g. cluster md
raid1.  I suspect there are better approaches than pvmove to solve the
broader problem.

Dave

  reply	other threads:[~2020-07-08 16:05 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-08  3:55 Gang He
2020-07-08 16:05 ` David Teigland [this message]
2020-07-09  0:44   ` Gang He
2020-07-09 17:01     ` David Teigland

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200708160519.GA23533@redhat.com \
    --to=teigland@redhat.com \
    --cc=GHe@suse.com \
    --cc=linux-lvm@redhat.com \
    --subject='Re: [linux-lvm] About online pvmove/lvresize on shared VG' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).