[ClusterLabs] Antw: Re: [Slightly OT] OCFS2 over LVM

Ulrich Windl Ulrich.Windl at rz.uni-regensburg.de
Tue Aug 25 04:45:56 EDT 2015

>>> Digimer <lists at alteeve.ca> schrieb am 24.08.2015 um 18:20 in Nachricht
<55DB4453.10109 at alteeve.ca>:
> Using a pair of nodes with a traditional file system exported by NFS and
> made accessible by a floating (virtual) IP address gives you redundancy
> without incurring the complexity and performance overhead of cluster
> locking. Also, you won't need clvmd either. The trade-off through is
> that if/when the primary fails, the nfs daemon will appear to restart to
> the users and that may require a reconnection (not sure, I use nfs
> sparingly).

But that's a cheap trick: You say don't provide HA-storage (CFS), but use existing one (NFS). How do you build a HA-NFS server? You need another cluster. Not everybody has that many nodes available.

> Generally speaking, I recommend always avoiding cluster FSes unless
> they're really required. I say this as a person who uses gfs2 in every
> cluster I build, but I do so carefully and in limited uses. In my case,
> gfs2 backs ISOs and XML definition files for VMs, things that change
> rarely so cluster locking overhead is all but a non-issue, and I have to
> have DLM for clustered LVM anyway, so I've already incurred the
> complexity costs so hey, why not.
> -- 
> Digimer
> Papers and Projects: https://alteeve.ca/w/ 
> What if the cure for cancer is trapped in the mind of a person without
> access to education?
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