Gluster users - Aug 2010 - Gluster Storage Platform volume options

I would just like some clarification on the different options for GSP storage
volumes.
 
None - this option distributes the files across all servers such that a file
resides on some server but not necessarily on a specific server.
If you have 4 servers, you can get 4x the volume space.
*as a side question, what is a good way to see what server the file is actually
on.  Since console access is disabled are there any
other suggestions?
 
Mirror - every file resides on every server.  if there are four servers and a
file is copied into the volume each server gets a copy
of that file.  
*does this restrict the maximum size of the volume to the same size as if you
were using one server?
 
*also which one of these options allows for Automatic File Recovery and Self
Healing?
 
Thank you.

Hi,

Please check my in-line reply.

brock brown wrote:
> I would just like some clarification on the different options for GSP
storage
> volumes.
> 
> None - this option distributes the files across all servers such that a
file
> resides on some server but not necessarily on a specific server. If you
have
> 4 servers, you can get 4x the volume space. *as a side question, what is a
> good way to see what server the file is actually on.  Since console access
is
> disabled are there any other suggestions?
> 
Yes.  None type is known as Plain Distribute.  GlusterFS uses hash algorithm for
Distribute in which the destination server is decided by the file name hash. 
GlusterFS 3.1 will have an option for this lookup.

Console access is available by going to virtual terminal in Alt-F2 to Alt-F6. 
Also the server is accessible by ssh.

> Mirror - every file resides on every server.  if there are four servers and
a
> file is copied into the volume each server gets a copy of that file. *does
> this restrict the maximum size of the volume to the same size as if you
were
> using one server?
> 
Mirror type is Distributed mirror.  If there are four servers, distribute is on 
top of two pairs.  Each pair contains two servers.  The maximum size of the 
volume is half the size of space in total of all four servers.

> *also which one of these options allows for Automatic File Recovery and
Self
> Healing?
> 
Self healing is on by default and it does automatic file recovery.


Regards,
Bala

Thank you for your answers, that is what i needed to know.  
What is the default username and password I should use to SSH into the storage
servers?