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:[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
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