If disk is readonly, then you dont need custer file system at all - create ext3 or reiserfs FS and use it.
Idea, as I can see, is in allowing one node to update and other to read only, but keep overall stability as in non-clustered FS (clustered FS in unstable beast by definition, because of many possible split-brain scenarios, fencings and so on). Allowing other nodes to run heartbeat means, again, the same quorum/fencing/timeouts problems which we have on all cluster file systems, and which are extremely serious on OCFS2. ----- Original Message ----- From: "Sutterfield, Geary L." <[EMAIL PROTECTED]> To: "Sunil Mushran" <[EMAIL PROTECTED]> Cc: <[email protected]> Sent: Monday, November 13, 2006 3:07 PM Subject: RE: [Ocfs2-users] Soft and Hard Readonly? 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:[EMAIL PROTECTED] Sent: Monday, November 13, 2006 4:39 PM To: Sutterfield, Geary L. Cc: [email protected] 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 > > ----------------------------------------------------------------------- - > > _______________________________________________ > Ocfs2-users mailing list > [email protected] > http://oss.oracle.com/mailman/listinfo/ocfs2-users > _______________________________________________ Ocfs2-users mailing list [email protected] http://oss.oracle.com/mailman/listinfo/ocfs2-users _______________________________________________ Ocfs2-users mailing list [email protected] http://oss.oracle.com/mailman/listinfo/ocfs2-users
