[Ocfs2-users] Soft and Hard Readonly?

[Sunil Mushran]

Yes.

If one were to have the fs allow read-write on one node and
hard read only on the others, the ro nodes will start encountering
stale inode errors as the cached inode(s) get out of sync with the
disk inode.

Sutterfield, Geary L. wrote:
> By "actual readonly" I assume you mean at the hardware level. So a disk
> connected via a SAN could use soft readonly but not hard readonly. And
> that would mean a heartbeat would be started. And that would mean the
> node could be fenced. Does that sound correct?
>
> Geary Sutterfield
> Lead Software Systems Engineer
> Software Solutions and Technology
> The MITRE Corporation
> 703-983-5667
>
> -----Original Message-----
> From: Sunil Mushran [mailto:Sunil.Mushran at oracle.com] 
> Sent: Monday, November 13, 2006 4:39 PM
> To: Sutterfield, Geary L.
> Cc: ocfs2-users at oss.oracle.com
> Subject: Re: [Ocfs2-users] Soft and Hard Readonly?
>
> To mount readonly, do:
> mount -o ro /dev/sdX /dir
>
> The difference between soft and hard is that in the latter the
> heartbeat 
> is not
> started. Meaning no need to join a dlm domain. The latter only works on
> actual readonly devices.
>
> Sutterfield, Geary L. wrote:
>   
>> I've seen some discussions in the past about "soft readonly" and
>>     
> "hard 
>   
>> readonly" options in OCFS2. But I can't seem to find a description of
>>     
>
>   
>> them anywhere. Do I have look at code comments? Or is there another 
>> place that describes how these work? Are they mount options?
>>  
>> I'm trying to configure a cluster with a single write-enabled server 
>> and multiple read-only servers. Does anyone have experience with this
>>     
>
>   
>> type of configuration? Can the hard readonly or soft readonly options
>>     
>
>   
>> be used to create such a configuration? If anyone has any experience 
>> setting up a cluster like this, I'd like to hear about your 
>> configuration and your experiences.
>>  
>> Thanks
>>  
>> Geary Sutterfield
>> Lead Software Systems Engineer
>> Software Solutions and Technology
>> The MITRE Corporation
>>  
>>
>>     
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