[Beowulf] how cluster's storage can be flexible/expandable?

Joe Landman landman at scalableinformatics.com
Tue Nov 13 10:18:51 PST 2012


That's not the issue with glusterfs.  It's distributed metadata architecture is a double edged sword.  Very good for distributed data, very very bad for metadata heavy ops.  

That and the xfs attributes haven't been slow in years though some folks like bringing up the old behavior pre 2.6.26 as examples of why you shouldn't use it.   Dave Chinner has a great presentation on the topic from 15 months ago or so.  Puts down real numbers.  Situation is rather different than implied.

Please pardon brevity and typos ... Sent from my iPhone

On Nov 13, 2012, at 9:13 AM, Gregory Matthews <greg.matthews at diamond.ac.uk> wrote:

> On 13/11/12 10:04, Jonathan Barber wrote:
> 
>> Gluster makes extensive use of extended attributes, XFS extended
>> attribute performance in kernel versions<  2.6.39 is very poor. [1]
>> This makes XFS a poor choice in environments where files are smaller
>> than ~500MB
> 
> thats interesting... do you have a reference for that? did I miss it?
> 
> GREG
> 
>> """
>> 
>> Have fun!
>> 
>>> Thanks,
>>> 
>>> D.
>>> 
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