Why does VDSM choose the centric-control instead of distribute-control in the
management of LVM metadata?
Is that any historical reason for this?
[mailto:vdsm-devel-boun...@lists.fedorahosted.org] On Behalf Of tsiren tsi
Sent: Thursday, June 20, 2013 11:00 PM
Subject: [vdsm] why does VDSM use the SPM to manage and protect the LVM
As is known to all, sanlock can manage and protect the meta-data which would be
modified one by one.
Sanlock can be used as the cluster lock with the ids file and lease file. Paxos
lease ensures the consistence between all the nodes.
In the condition of modifying LVM meta-data(create, delete, extend, and etc) ,
the sanlock acquire function would be called to lock the block(LUN). Once the
operation finished, we could call the sanlock release function to unlock the
block.In this case, we could no longer maintain the two modules(mailbox and
I think that it would be simplify the realization of VDSM. Does anyone consider
If we just used the sanlock as the cluster lock, could be the frequent usage of
lock(or aquire) and unlock(or release) a performance bottleneck of sytem?
Appreciate for your repy, thank you
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