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From: Eric Ren <>
To: David Teigland <>,
	LVM general discussion and development <>
Subject: [linux-lvm] The benefits of lvmlockd over clvmd?
Date: Tue, 9 Jan 2018 11:15:24 +0800	[thread overview]
Message-ID: <> (raw)

Hi David,

Regarding the question of the subject, I can think of three main 
benefits of lvmlockd over clvmd:

- lvmlockd supports two cluster locking plugins: dlm and sanlock. 
sanlock plugin can supports up to ~2000 nodes
  that benefits LVM usage in big virtulizaton/storage cluster, while dlm 
plugin fits HA clsuter.

- lvmlockd has better design than clvmd. clvmd is command-line level 
based locking system, which means the
  whole LVM software will get hang if any LVM command gets dead-locking 
issue. However, lvmlockd is *resources* based
cluster locking. The resources to protect is VG and LV so that the 
deadlock issue will be isolated inside the resource and
operations on other VG/LV can still proceed.

- lvmlockd can work with lvmetad.

But, I may be wrong in some points. Could you please help correct me and 
complete the benefit list?


             reply	other threads:[~2018-01-09  3:15 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-01-09  3:15 Eric Ren [this message]
2018-01-09 16:06 ` [linux-lvm] The benefits of lvmlockd over clvmd? David Teigland
2018-01-10  7:11   ` Eric Ren
2018-01-10  9:36     ` Zdenek Kabelac
2018-01-10 14:42       ` Eric Ren
2018-01-10 15:35         ` Zdenek Kabelac
2018-01-10 17:25           ` David Teigland
2018-01-10 16:45     ` David Teigland

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