[linux-lvm] The benefits of lvmlockd over clvmd?
zren at suse.com
Tue Jan 9 03:15:24 UTC 2018
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?
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