[ClusterLabs] Antw: Re: [Slightly OT] OCFS2 over LVM
lists at alteeve.ca
Tue Aug 25 12:02:33 EDT 2015
On 25/08/15 04:45 AM, Ulrich Windl wrote:
>>>> 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
> 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.
DRBD in single-primary will do the job just fine. Recovery is simply a
matter of; fence -> promote to primary -> mount -> start nfs -> take
virtual IP, done.
Only 2-nodes needed. This is a common setup.
>> 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.
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