Gluster users - Jan 2016 - File Corruption when adding bricks to live replica volumes

On 22/01/2016 10:07 PM, Krutika Dhananjay wrote:
> Could you do the following:
> 1) Disable client-side healing:

Will do. Wasn't aware there were different types of healing - is there 
client and server side heals? are there any docs on this?

thanks,

-- 
Lindsay Mathieson

There is no doc to my knowledge. I will write one, now that you pointed it out.
;)

Client-side heals are heals that happen from the GlusterFS client, as part of
LOOKUP, sometimes even READ, [F]STAT, etc.
You can tell when a client did a heal if a corresponding log message appears in
that client's log file (usually the ones with MSGID: 108026, although name
heals aren't logged).
They are enabled by default. 
To disable entry heal from clients for instance, you do #gluster volume set
<VOL> cluster.entry-self-heal off
To disable data self-heal from clients, you do #gluster volume set <VOL>
cluster.data-self-heal off

If you want to prevent the client from doing self-heal altogether, you disable
all three forms of client healing: data-self-heal, entry-self-heal and
metadata-self-heal.

Server side heals are heals that are performed by the self-heal daemon. You will
see log messages with MSGID: 108026 in glustershd.log when the self-heal-daemon
performs a heal.
Server side heals happen in the following cases: 
1) when you execute #gluster volume heal <VOL> full 
2) when you execute #gluster volume heal <VOL> 
3) when a brick that was previously down comes back up. 

To disable server side heal, you need to disable the self-heal-daemon. You can
do that with #gluster volume set <VOL> cluster.self-heal-daemon off

HTH, 
Krutika 
----- Original Message -----
> From: "Lindsay Mathieson" <lindsay.mathieson at gmail.com>
> To: "Krutika Dhananjay" <kdhananj at redhat.com>
> Cc: "gluster-users" <gluster-users at gluster.org>
> Sent: Friday, January 22, 2016 5:51:01 PM
> Subject: Re: [Gluster-users] File Corruption when adding bricks to live
> replica volumes
> On 22/01/2016 10:07 PM, Krutika Dhananjay wrote:
> > Could you do the following:
> > 1) Disable client-side healing:
> Will do. Wasn't aware there were different types of healing - is there
> client and server side heals? are there any docs on this?
> thanks,
> --
> Lindsay Mathieson
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