[Gluster-users] AFR performance killer

Shehjar Tikoo shehjart at zresearch.com
Wed Apr 15 09:25:02 UTC 2009

Marko wrote:
> Hi Shehjar,
> Answers: 1.) Filesystem is default ext3 mounted with 
> "defaults,noatime"

I see that each server, i.e. iscsi1 and iscsi2, has /srv/gluster
as the backend in their corresponding xen domains, but did the
xen domains also share the same disks/storage device?


> 2.) I think it how it was becouse I always put io-threads as top(or 
> near top) translator.  Iin TEST5 "iot" can be ignored. 3.) 
> Server(brick) iscsi2 was also client on which I was running the test 
> and it was also a Xen guest.
> One more thing I'd like to point out. In documentation I miss 
> information of best practices which translators should be put 
> before/after other translators. Example: should one put io-threads 
> before or after io-cache? What does it mean if you configure either 
> way.
> Regards, Marko
> Shehjar Tikoo wrote:
>> Marko wrote:
>>> this document is made for my personal reference so it's a little 
>>> raw.
>> A few questions:
>> 1. What was the on-disk file system and the disk organization under
>>  the file system?
>> 2. In the TEST5 volfile, the volume iot is dangling. Is that how it
>>  actually was during the test or was it interposed between volume 
>> wb and volume AFR?
>>>> On Wed, Apr 8, 2009 at 6:18 PM, Marko <gluster at sopca.com 
>>>> <mailto:gluster at sopca.com>> wrote:
>>>> Hello,
>>>> To clearify: * im testing with gluisterfs-2.0.0rc7 * all bricks
>>>>  are on same physical server(Xen guests). It's a testing 
>>>> environment.
>> Were the client side tests( i.e., both the test program like 
>> make-many-files and the corresponding glusterfs client..) also 
>> running in a Xen guest?
>> Thanks Shehjar

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